{"title":"Bulk Sterile Grain Bags","description":"\u003ch1\u003e\u003cstrong\u003eBulk Sterile Mushroom Grain Bags UK\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eSecure your supply chain with premium, lab-grade sterile grain bags manufactured right here in Kent, UK. Designed for commercial farms and scaling producers, our bulk sterile mushroom grain bags offer the consistent hydration and absolute sterility required for high-yield mycelium colonisation, without the overhead of running your own autoclave.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhy Partner with Martian Mushrooms?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK Manufacturer:\u003c\/strong\u003e Direct from our dedicated laboratory in Kent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLab-Grade Sterility:\u003c\/strong\u003e Professional-grade sterilisation processes ensuring 100% contaminant-free grain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Savings:\u003c\/strong\u003e Bigger orders, bigger savings. Discounts from 25 packs all the way to 1000+.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e: We’ve got your back - sterility issues? We’ll replace it, no questions, for you and your customers too.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Supply:\u003c\/strong\u003e No MOQs on standard orders; BNPL available via Klarna and Shop Pay.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Shipping:\u003c\/strong\u003e From dropshipping to 3PL, we make it work for you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick Turnaround:\u003c\/strong\u003e UK-wide delivery you can actually rely on - keeps your shelves stocked without drama.\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\/sterilised-grain\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFor Bulk Growers (farms, scaling producers \u0026amp; high-volume cultivators)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eWhen you’re running multiple inoculation days, you don’t just need grain - you need predictable performance. Our wholesale sterile grain bags are made to minimise variables so your focus stays on throughput and yield targets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistency at commercial scale:\u003c\/strong\u003e tight production controls and repeatable batches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSterility-first manufacturing:\u003c\/strong\u003e built for clean inoculations and stable colonisation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply-chain reliability:\u003c\/strong\u003e direct-from-manufacturer availability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorkflow efficiency:\u003c\/strong\u003e bulk quantities reduce ordering friction and stock-outs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport for scaling:\u003c\/strong\u003e custom specs and scheduling available for recurring demand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eFor Product Sellers (retailers, hydroponics shops \u0026amp; resellers)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eYour customers pay attention. To everything. A tiny contaminant. A week where stock runs dry. Even a batch that’s technically fine but just… underwhelming. It doesn’t take much for confidence to dip, and once it does, it’s hard to win back.\u003c\/p\u003e\n\u003cp\u003eThat’s why our trade-prepared sterile grain bags aren’t simply about supplying mushrooms. They’re about protecting your profit and your name at the same time - because in retail, those two are closely tied together.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Supply:\u003c\/strong\u003e Restock confidently, without last-minute surprises or inconsistent supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetail-friendly:\u003c\/strong\u003e The Lifetime Guarantee helps minimise risk and keeps aftersales issues to a minimum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand Your Range:\u003c\/strong\u003e Choose white-label for a seamless addition to your shelf, or opt for fully custom production tailored to your business.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffortless Fulfilment:\u003c\/strong\u003e We take care of dropshipping and 3PL, keeping your supply chain reliable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerks for Growth:\u003c\/strong\u003e Tiered pricing, priority help, and some added bonuses that make running your business just a little easier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Range Overview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis collection focuses on our core bulk grain bag line:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Sterilised Millet Mushroom Grain Spawn Bag\u003c\/strong\u003e - Clean, ready-to-go millet that loves a good inoculation. Colonises fast and evenly - pretty much does the heavy lifting for you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Sterilised Rye Mushroom Grain Spawn Bag\u003c\/strong\u003e - Clean, properly hydrated rye that’s built for a strong start. Colonises thick and sturdy - gives your mycelium a solid base to run with.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNeed a Full Production Pipeline?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003ePair these bags with our \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/bulk-mushroom-substrates\"\u003eBulk Mushroom Substrates\u003c\/a\u003e and \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/bulk-mushroom-fruiting-blocks\"\u003eBulk Fruiting Blocks\u003c\/a\u003e, or source finished \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/bulk-mushroom-grain-spawn\"\u003eBulk Grain Spawn\u003c\/a\u003e options for specific species lines.\u003c\/p\u003e","products":[{"product_id":"bulk-sterilised-millet-mushroom-grain-spawn-bag","title":"Bulk Sterilised Millet Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Sterilised Millet Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your spawn production with lab-prepped millet \u0026amp; milo grain that’s ready to inoculate. Built for growers who care about consistent colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach bulk 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 between 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 Sterilised Grain Blend\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised millet + milo (milo = sorghum) grain blend, optimally hydrated and sealed in an injection-port bag - designed as a fast, contamination-resistant foundation for grain spawn production.\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\/sterilised-millet-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\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\u003eRapid colonisation\u003c\/strong\u003e - Smaller millet grains mean mycelium finds more spots to grow, letting it cover the substrate faster than larger grains.\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\u003cli\u003e\n\u003cstrong\u003eSelf-healing injection ports\u003c\/strong\u003e - Make inoculation straightforward, whether you’re using spores or liquid culture.\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\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated millet \u0026amp; milo blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready to inoculate 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 sterile grain line with repeatable quality\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 inoculation runs with consistent, clean grain\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 to bulk with CVG-style substrates for tub grows\u003c\/li\u003e\n\u003cli\u003eWood-based fruiting blocks when paired with hardwood substrate mixes\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 sterilised millet \u0026amp; milo grain 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 the injection area on the bag.\u003c\/li\u003e\n\u003cli\u003eInject your spores or culture through the self-healing port.\u003c\/li\u003e\n\u003cli\u003eIncubate until colonised (often 3–4 weeks, depending on culture and conditions).\u003c\/li\u003e\n\u003cli\u003eSpawn to bulk:\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cul\u003e\n\u003cli style=\"list-style-type: none;\"\u003e\n\u003cul\u003e\n\u003cli\u003eFor monotub grows: 2:1 CVG bulk substrate : spawn\u003c\/li\u003e\n\u003cli\u003eFor gourmet mushrooms on wood substrate: 6:1 wood substrate : spawn\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\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.\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Specifications\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\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBulk Sterilised Millet Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMillet + milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~50% water content\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInoculation guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~5ml spore or culture solution via injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\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\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\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 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 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":56356925276504,"sku":null,"price":226.75,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56356925309272,"sku":null,"price":414.5,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56356925342040,"sku":null,"price":751.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56356925374808,"sku":null,"price":1682.5,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56356925407576,"sku":null,"price":2915.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56356925440344,"sku":null,"price":5180.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkSterilisedMilletMushroomGrainSpawnBag1.5kg.png?v=1765210123"},{"product_id":"bulk-sterilised-rye-mushroom-grain-spawn-bags","title":"Bulk Sterilised Rye Mushroom Grain Spawn Bag","description":"\u003ch1\u003eBulk Sterilised Rye Mushroom Grain Spawn Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your spawn production with lab-prepped rye grain that’s ready to inoculate. Built for growers who care about consistent colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach bulk rye 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 between 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 Rye Grain\u003c\/h2\u003e\n\u003cp\u003eThis is our best-selling sterilised rye grain, optimally hydrated and sealed in an injection-port bag - designed as a fast, contamination-resistant foundation for grain spawn production.\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\/sterilised-grain\"\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\u003eStrong, clean colonisation\u003c\/strong\u003e – Firm rye kernels hold their structure well and shake up easily, helping mycelium spread evenly through the bag.\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\u003cli\u003e\n\u003cstrong\u003eSelf-healing injection ports\u003c\/strong\u003e - Make inoculation straightforward, whether you’re using spores or liquid culture.\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\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready to inoculate 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 sterile grain line with repeatable quality\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 inoculation runs with consistent, clean grain\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 to bulk with CVG-style substrates for tub grows\u003c\/li\u003e\n\u003cli\u003eWood-based fruiting blocks when paired with hardwood substrate mixes\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 sterilised rye grain 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 the injection area on the bag.\u003c\/li\u003e\n\u003cli\u003eInject your spores or culture through the self-healing port.\u003c\/li\u003e\n\u003cli\u003eIncubate until colonised (often 3–4 weeks, depending on culture and conditions).\u003c\/li\u003e\n\u003cli\u003eSpawn to bulk:\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cul\u003e\n\u003cli style=\"list-style-type: none;\"\u003e\n\u003cul\u003e\n\u003cli\u003eFor monotub grows: 2:1 CVG bulk substrate : spawn\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFor gourmet mushrooms on wood substrate: 6:1 wood substrate : spawn\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\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.\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 293.907px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 75.3743%; 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: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; height: 19.5938px;\"\u003eBulk Sterilised Rye Mushroom Grain Spawn Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eGrain blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; height: 19.5938px;\"\u003eRye grain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 21.8506%; height: 39.1875px;\"\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; height: 39.1875px;\"\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; 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: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; 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: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; 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: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eInoculation guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; height: 19.5938px;\"\u003e~5ml spore or culture solution via injection port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 58.7812px;\"\u003e\n\u003ctd style=\"width: 21.8506%; height: 58.7812px;\"\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; height: 58.7812px;\"\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: 21.8506%; height: 39.1875px;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; 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: 21.8506%; height: 19.5938px;\"\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.3743%; 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 Rye 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 rye 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":56783053160792,"sku":null,"price":226.75,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56783053193560,"sku":null,"price":414.5,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56783053226328,"sku":null,"price":751.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56783053259096,"sku":null,"price":1682.5,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56783053291864,"sku":null,"price":2915.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56783053324632,"sku":null,"price":5180.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkSterilisedMilletMushroomGrainSpawnBag1.5kg_847d41db-e0db-4ccc-a2bc-e36c3a11dd08.png?v=1771948066"}],"url":"https:\/\/martian-mushrooms.com\/collections\/bulk-sterile-grain-bags.oembed","provider":"Martian Mushrooms","version":"1.0","type":"link"}