{"title":"Bulk Mushroom Grain Spawn Bags","description":"","products":[{"product_id":"bulk-lions-mane-mushroom-grain-spawn-bag","title":"Bulk Lion's Mane Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Lion’s Mane Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Lion’s Mane grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Lion’s Mane grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWholesale‑Ready Lion’s Mane Grain Spawn\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and and fully colonised with vigorous Lion’s Mane mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/lions-mane-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Advantages\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003eScale whenever you’re ready - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eWhat You Get\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Lion’s Mane grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eBuilt For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Lion’s Mane spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Lion’s Mane grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eWhat’s Included\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Lion’s Mane grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eHow It Works\u003c\/strong\u003e\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Lion’s Mane grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Lion’s Mane performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003e\u003cstrong\u003eQuality Guarantee\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Lion’s Mane Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003e\u003cstrong\u003eMartian Mushrooms vs. Competitors\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Lion’s Mane mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56357067358552,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56357067391320,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56357067424088,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56357067456856,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56357067489624,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56357067522392,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkLion_sManeMushroomGrainSpawnBag.png?v=1765212880"},{"product_id":"bulk-king-oyster-mushroom-grain-spawn-bag","title":"Bulk King Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eKing Oyster\u003c\/span\u003e mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eKing Oyster\u003c\/span\u003e grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready \u003cmeta charset=\"UTF-8\"\u003e King Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eKing Oyster\u003c\/span\u003e mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/king-oyster-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready King Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk \u003cmeta charset=\"UTF-8\"\u003e \u003cspan\u003eKing Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eKing Oyster\u003c\/span\u003e mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56746248601944,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56746248634712,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56746248667480,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56746248700248,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56746248733016,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56746248765784,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkKingOysterMushroomGrainSpawnBag.png?v=1771514277"},{"product_id":"bulk-blue-oyster-mushroom-grain-spawn-bag","title":"Bulk Blue Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Blue Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/blue-oyster-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready \u003cspan\u003eBlue Oyster\u003c\/span\u003e spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk \u003cspan\u003eBlue\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56746252796248,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56746252829016,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56746252861784,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56746252894552,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56746252927320,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56746252960088,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkBlueOysterMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-golden-oyster-mushroom-grain-spawn-bag","title":"Bulk Golden Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Golden Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/golden-oyster-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready \u003cspan\u003eGolden\u003c\/span\u003e Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk \u003cspan\u003eGolden\u003c\/span\u003e\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56746261807448,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56746261840216,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56746261872984,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56746261905752,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56746261938520,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56746261971288,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkGoldenOysterMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-elm-oyster-mushroom-grain-spawn-bag","title":"Bulk Elm Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Elm\u003cspan\u003e Oyster \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Elm\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Elm\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Elm Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Elm\u003cspan\u003e Oyster\u003c\/span\u003e mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/elm-oyster-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Elm\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Elm Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Elm\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Elm\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Elm\u003cspan\u003e Oyster\u003c\/span\u003e grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Elm\u003cspan\u003e Oyster\u003c\/span\u003e performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Elm\u003cspan\u003e Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Elm\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56746271342936,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56746271375704,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56746271408472,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56746271441240,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56746271474008,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56746271506776,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkElmOysterMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-pink-oyster-mushroom-grain-spawn-bag","title":"Bulk Pink Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Pink\u003cspan\u003e Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Pink\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Pink\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Pink Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Pink\u003cspan\u003e Oyster\u003c\/span\u003e mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/pink-oyster-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Pink\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Pink Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Pink\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Pink\u003cspan\u003e Oyster\u003c\/span\u003e grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Pink\u003cspan\u003e Oyster\u003c\/span\u003e grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Pink\u003cspan\u003e Oyster\u003c\/span\u003e performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Pink\u003cspan\u003e Oyster\u003c\/span\u003e Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Pink\u003cspan\u003e Oyster\u003c\/span\u003e mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56752039919960,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56752039952728,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56752039985496,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56752040018264,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56752040051032,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56752040083800,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkPinkOysterMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-shiitake-mushroom-grain-spawn-bag","title":"Bulk Shiitake Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Shiitake\u003cspan\u003e \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Shiitake\u003cspan\u003e mushroom \u003c\/span\u003egrows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Shiitake grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Shiitake Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Shiitake mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/shiitake-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Shiitake grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Shiitake spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Shiitake grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Shiitake grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Shiitake grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Shiitake performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Shiitake Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Shiitake mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56752057057624,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56752057090392,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56752057123160,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56752057155928,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56752057188696,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56752057221464,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkShiitakeMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-reishi-mushroom-grain-spawn-bag","title":"Bulk Reishi Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Reishi\u003cspan\u003e \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Reishi\u003cspan\u003e mushroom \u003c\/span\u003egrows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Reishi grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Reishi Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Reishi mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/reishi-mushroom-grain-spawn-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Reishi grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Reishi spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Reishi grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Reishi grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Reishi grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Reishi performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Reishi Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Reishi mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56752060596568,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56752060629336,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56752060662104,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56752060694872,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56752060727640,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56752060760408,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkReishiMushroomGrainSpawnBag.png?v=1771514276"},{"product_id":"bulk-black-pearl-king-oyster-mushroom-grain-spawn-bag","title":"Bulk Black Pearl King Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Black Pearl King Oyster Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Black Pearl King Oyster mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Black Pearl King Oyster grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Black Pearl King Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and and fully colonised with vigorous Black Pearl King Oyster mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/grain-spawn\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Black Pearl King Oyster grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Black Pearl King Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Black Pearl King Oyster grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Black Pearl King Oyster grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Black Pearl King Oyster grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Black Pearl King Oyster mushroom performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Black Pearl King Oyster Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Black Pearl King Oyster mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56788760297816,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56788760330584,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56788760363352,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56788760396120,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56788760428888,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56788760461656,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkBlackPearlKingOysterMushroomGrainSpawnBag.png?v=1771952315"},{"product_id":"bulk-speckled-chestnut-mushroom-grain-spawn-bag","title":"Bulk Speckled Chestnut Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Speckled Chestnut\u003cspan\u003e \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Speckled Chestnut\u003cspan\u003e mushroom \u003c\/span\u003egrows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Speckled Chestnut grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Speckled Chestnut Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Speckled Chestnut mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/grain-spawn\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Speckled Chestnut grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Speckled Chestnut spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Speckled Chestnut grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Speckled Chestnut grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Speckled Chestnut grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Speckled Chestnut performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.71875px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.59375px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eBulk Speckled Chestnut Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Speckled Chestnut mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56788795523416,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56788795556184,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56788795588952,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56788795621720,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56788795654488,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56788795687256,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkChestnutMushroomGrainSpawnBag.png?v=1771952316"},{"product_id":"bulk-pioppino-mushroom-grain-spawn-bag","title":"Bulk Pioppino Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Pioppino\u003cspan\u003e \u003c\/span\u003eMushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Pioppino\u003cspan\u003e mushroom \u003c\/span\u003egrows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Pioppino grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Pioppino Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and fully colonised with vigorous Pioppino mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/grain-spawn\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Pioppino grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Pioppino spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Pioppino grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Pioppino grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Pioppino grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Pioppino performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.71875px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.59375px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eBulk Pioppino Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.59375px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.59375px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.59375px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Pioppino mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56788804239704,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56788804272472,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56788804305240,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56788804338008,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56788804370776,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56788804403544,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkPioppinoMushroomGrainSpawnBag.png?v=1771952316"},{"product_id":"bulk-pearl-oyster-mushroom-grain-spawn-bag","title":"Bulk Pearl Oyster Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Pearl Oyster Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your Pearl Oyster mushroom grows with vigorous, fully colonised grain spawn - ready to mix straight into hardwood or Master’s Mix substrates for fast, dependable colonisation. Built for growers who care about strong colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Pearl Oyster grain spawn bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose from 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Pearl Oyster Grain Spawn\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and and fully colonised with vigorous Pearl Oyster mycelium - ready to spawn straight to bulk. Sealed in a sterile bag for clean handling and consistent performance, this is a fast, reliable foundation for repeatable bulk runs at scale.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile grain range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/grain-spawn\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast bulk colonisation\u003c\/strong\u003e - A fully colonised grain bag delivers dense, distributed mycelium throughout the grain, supporting quick bulk colonisation and reducing the time the substrate sits uncolonised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Grain is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003e1.5kg Pearl Oyster grain spawn bag - fully colonised and standardised for consistent runs and simple SOPs.\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready for spawning to bulk on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a production‑ready Pearl Oyster spawn line with repeatable results\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven grain blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine bulk spawning with fully colonised, clean Pearl Oyster grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning directly into supplemented hardwood sawdust mixes\u003c\/li\u003e\n\u003cli\u003eFast “take‑off” and consistent runs when expanding into bulk production substrates\u003c\/li\u003e\n\u003cli\u003eCycle consistency when you need predictable colonisation windows (typically 3–4 weeks, culture-dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1.5kg Pearl Oyster grain spawn bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and wipe down your tools and mixing area.\u003c\/li\u003e\n\u003cli\u003eBreak up the spawn inside the sealed bag. Massage the bag to separate the fully colonised Pearl Oyster grain into loose kernels.\u003c\/li\u003e\n\u003cli\u003ePrepare your bulk substrate (wood-based). Pearl Oyster mushroom performs best on hardwood-based mixes (e.g., supplemented hardwood sawdust\/pellets). Make sure your substrate is properly pasteurised or sterilised for your recipe.\u003c\/li\u003e\n\u003cli\u003eOpen the bag in a clean area and mix the spawn evenly through your substrate.\u003c\/li\u003e\n\u003cli\u003eIncubate until fully colonised.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: grain is soaked\/cooked, hydrated to ~50% water content, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 254.719px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 72.9102%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBulk Pearl Oyster Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpawning guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eBreak up grains and mix into bulk wood substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 39.1875px;\"\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.2327%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 72.9102%; height: 19.5938px;\"\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Millet + Milo Grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInjection Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing rubber injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let grain prep slow you down. Ensure your supply chain with the UK's most reliable bulk Pearl Oyster mushroom grain spawn.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56789757264216,"sku":null,"price":220.25,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56789757296984,"sku":null,"price":407.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56789757329752,"sku":null,"price":746.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56789757362520,"sku":null,"price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56789757395288,"sku":null,"price":3135.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56789757428056,"sku":null,"price":5760.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkPearlOysterMushroomGrainSpawnBag.png?v=1771952315"}],"url":"https:\/\/martian-mushrooms.com\/collections\/bulk-mushroom-grain-spawns.oembed","provider":"Martian Mushrooms","version":"1.0","type":"link"}