1 1

King Oyster Grow Kit

King Oyster Grow Kit

£25.95 GBP
£29.95 GBP £25.95 GBP
Sale Sold out
Tax included. Shipping calculated at checkout.
Weight
Bundle Packs
1 Pack
Save 25%
2 Pack
Save 25%
3 Pack
Save 30%
6 Pack
Save 35%
12 Pack
Save 40%
How do subscriptions work?

  • Get exclusive deals

    Subscribe for unique discounts

  • Edit your subscription anytime

    Edit products, delivery schedule and more

  • No commitment

    Easy to cancel if it’s not for you
Manage subscriptions Powered by
  • FREE UK DELIVERY
  • LIFETIME GUARANTEE

Our King Oyster (Pleurotus eryngii) Mushroom Fruiting Block Kit is specially designed to yield thick, dense and delicious mushrooms with ease. These kits come ready to fruit and harvest, meaning there’s no need to faff around inoculating and colonising your own substrate; you can get straight to the fun part.   

🍄 Pre-colonised fruiting block that is ready to fruit   

⚖️ Grow large yields of up to 1kg+ of fresh King Oyster  

✨ Minimal space required to grow & requires little effort  

🗓️ Harvest mushrooms quickly within 2 weeks   

🛡️ Guaranteed to produce mushrooms or we’ll replace your kit free of charge  

Want to learn how to grow mushrooms with this kit? See our online guide here.

View full details

Description

THE HASSLE FREE, READY TO FRUIT SOLUTION TO GROWING KING OYSTER AT HOME 

King Oyster mushrooms have a rich culinary tradition in Asia, where they are valued for their satisfying, meaty texture and adaptability in classic dishes. They were first grown in the Mediterranean and then spread across East Asia (1). These mushrooms are popular in many different cuisines because they are a high source of fibre and protein, as well as being totally delicious to eat! 

King Oyster mushrooms are now well-known for their deep, umami taste. Researchers are also studying these mushrooms for compounds like ergothioneine and beta-glucans, which may have antioxidant properties (2). King Oysters also provide fibre and B vitamins, and they are a source of minerals such as potassium, calcium, iron and zinc (3). 

Their versatility makes them ideal for grilling, roasting or slicing into meaty “scallops” for plant-based dishes. The satisfying texture and flavour of King Oyster add dimension to many kinds of dishes, from hearty stews to gourmet meals. They have become a favourite for anyone looking to incorporate a little umami into their cooking. 

Growing your own King Oyster mushroom at home has never been easier with our King Oyster Mushroom Fruiting Block Kit. Whether you’re a seasoned grower or a complete beginner, our kit takes the guesswork out of mushroom cultivation and turns it into a fun, straightforward process. Say goodbye to complex setups and hello to thick, dense, and luscious clusters of mushrooms, ready to be cooked, extracted or dried.   

Our kit comes with everything you need in one convenient package: a pre-colonised fruiting block that is ready to go right out of the box - no need for messy inoculations or waiting periods.   

Simply follow our easy step-by-step guide, and watch your mushrooms grow! With minimal effort and space required, you’ll be harvesting beautiful, delicious King Oyster mushrooms in as little as two weeks.  

THE BENEFITS   

  • Beginner-friendly; no prior experience or knowledge required  

  • Harvest up to 1kg of fresh King Oyster from a single block  

  • Ready-to-fruit block makes the process quick and easy   

  • Guaranteed to produce mushrooms or we’ll replace your kit free of charge   

  • Save money by growing your own mushrooms at home  

  • Little space required to grow & is discreet with no smells  

  • King Oyster mushroom is packed with bioactive compounds like beta-glucan   

HOW TO USE  

The process is simple:  

Prepare the Block: Cut the top off the bag just below the seal, opening it up to the air.  

Maintain Humidity: Maintain a humid environment by misting the block two or three times daily or using a humidity tent.  

Humidity-Controlled Chamber: Alternatively, you can place the fruiting block in a chamber such as a MonoTub or Martha tent for optimal growth, as this will help maintain ideal fruiting conditions. 

Harvest: After around 14 days, the mushrooms should reach full size. Gently twist at the base to harvest. 

Gone are the days of having to trawl through decade-old forum posts to figure out the fascinating but often confusing science that is growing mushrooms. Our step-by-step, easy-to-follow guide ensures a successful harvest, eliminating guesswork and making the whole process a breeze.  

GROWING CONDITIONS  

Temperature:   

  • Colonisation: Around 25°C (77°F) for optimal mycelium growth.     

  • Fruiting: 16-21°C (61-70°F) to encourage primordia formation.  

Humidity: High humidity (over 80%) is essential for healthy, large fruits. Use misting, humidifiers, or a fruiting chamber to maintain humidity.     

Light:   

  • Colonisation: Complete darkness is preferred for rapid colonisation.     

  • Fruiting: Indirect sunlight or ambient light is sufficient.  

Fresh Air Exchange (FAE): Proper ventilation is necessary to provide the growing mushrooms with fresh air and prevent the buildup of carbon dioxide, which can inhibit growth.     

Sterility: Maintaining a clean and sterile environment is paramount to prevent contamination from other fungi or bacteria, which can compete with the mycelium and hinder its growth.  

INGREDIENTS   

Good ingredients make for excellent grow kits. That is why we only use 100% natural and organic grain and masters mix substrate in our kits. We only use high-quality, natural ingredients for our products, specifically selected to support the optimal growth of King Oyster mushrooms.  

Our proprietary substrate blend is a mix of optimally hydrated millet grains, milo grains, hardwood pellets, soy hulls and gypsum. This mixture is carefully hydrated to field capacity and sterilised in a computer-controlled steam autoclave for 2 hours at 121°C.   

The result is an optimal 6:1 substrate to spawn ratio. This is then inoculated with our own King Oyster liquid culture, the substrate providing the perfect nutrient rich environment for mycelium, promoting rapid colonisation, large yields and minimal risk of contamination.   

WHAT’S INCLUDED  

  • 1.25kg or 2kg (depending on selection) King Oyster Fruiting Block, packaged and sterilised in industry leading Unicorn grow bags  

  • Ultra Fine Mister (Optional)  

  • Humidity Tent (Optional)  

WE DO NOT INCLUDE   

Physical copy of the growing guide: You can find our online step-by-step mushroom growing guide here, as well as some of our own tips and tricks for optimising your grow. We highly recommend reading it before purchasing!  

STORAGE  

Please aim to use your King Oyster Mushroom Fruiting Block Kit soon after receiving it. If you are not using right away, store the bag in the fridge. Stored this way, your kit should last at least 3 months.  

  • EASY TO USE

  • MASSIVE YIELDS

  • SET & FORGET

  • SAVE MONEY

1 4

What people are saying

MUSHROOM GROWING MADE EASY

  • INJECT BAG

  • WAIT 4-6 WEEKS

  • HARVEST MUSHROOMS

1 3

MARTIAN MUSHROOMS

  • Can grow multiple mushrooms
  • QC lab tested for contaminants
  • Easy to use with help from our mycologists
  • Lifetime guarantee protected
  • Monster yield MS-4 substrate blend
  • Turbo colonisation times
  • AutoGrow Tek set & forget growing
  • Fun step by step guided process

GENERIC GROW KITS

  • Only grows a few species
  • Untested for contamination
  • Difficult to use without any on hand help
  • Not protected if something goes wrong
  • Lower yielding substrate
  • Slow colonising weak genetics
  • Lots of steps to get mushrooms
  • Frustrating to use with long process

FAQ

DOES THIS COME WITH SPORES OR CULTURE SYRINGE?

There is NO spore or culture syringe included with the Blank Grain Spawn Bag. It is non-inoculated to allow you to inject the species of your choice. Liquid cultures for gourmet varieties are available here.

HOW MANY SYRINGES DO I NEED?

You only need 5ml of spore or liquid culture solution per bag, so one syringe can inoculate 2 bags. We don’t recommend using more than 5ml per bag, because too much liquid can throw off the moisture content within the bag. 

You can store any unused solution in the fridge for future use. Stored that way, they’ll keep for many months. 

HOW IS THIS GRAIN BAG USED?

Fortunately, it’s really easy to use, you just need to follow our guides by clicking here.

HOW DO I STORE THIS GROW KIT?

Ideally do not store your grow kit and inoculate right away, if you are not using right away keep your kit in the fridge.

WHAT MUSHROOMS CAN BE GROWN WITH THIS KIT?

Our Martian Mushrooms kits are designed with versatility in mind and can support the growth of various edible and ornamental mushroom species. Some popular types of mushrooms that can be grown with our kits include Oyster mushrooms, Shiitake mushrooms, Lion’s Mane, Reishi, Chaga, Turkey Tail and many others that are legal and safe for cultivation at home.

It’s important to note that while our kits can technically support the growth of various types of mushrooms, we strongly advise against and do not condone the use of our kits for the cultivation of mushrooms that are illegal to grow in your country. This is due to the legal restrictions in many regions, including the UK where we are based, it is illegal to cultivate certain species of mushrooms.

At Martian Mushrooms, we are committed to promoting responsible and legal use of our products. We reserve the right to refuse service to anyone suspected of intending to use our products for illegal purposes. Always check and comply with your local laws and regulations regarding the cultivation and possession of mushrooms. Any customer service requests regarding the cultivation of illegal species will be ignored. 

CAN I GROW MULTIPLE TYPES OF MUSHROOMS WITH THE SAME KIT?

We dont recommend growing more than one type of mushroom per kit. Growing multiple types of mushrooms may result in poor flushes.

WHERE DOES THIS PRODUCT SHIP TO?

Please refer to our delivery details 

HOW LONG DOES IT TAKE TO GROW?

It will depend on a few different factors, mainly temperature. But it will range from about 4-8 weeks. 

FAQ

Our pre-colonised King Oyster Mushroom Fruiting Block Kit doesn't include spores or liquid culture, as it is already pre-colonised with King Oyster mycelium and ready to fruit. 

Fortunately, it’s really easy to use; you just need to follow our guides by clicking here.

  • 1.25kg or 2kg (depending on selection) King Oyster Fruiting Block, packaged and sterilised in industry leading Unicorn grow bags  
  • Ultra Fine Mister (Optional)  
  • Humidity Tent (Optional)  
  • Our Lifetime Guarantee  

WE DO NOT INCLUDE   

Physical copy of the growing guide: You can find our online step-by-step mushroom growing guide here, as well as some of our own tips and tricks for optimising your grow. We highly recommend reading it before purchasing! 

Please aim to use your King Oyster Mushroom Fruiting Block Kit soon after receiving it. If you are not using it right away, store the bag in the fridge. Stored this way, your kit should last at least 3 months.

Please refer to delivery details.

King Oyster mushrooms typically take about 1 to 2 weeks to start fruiting from a fully colonised kit, provided the conditions are optimal. This timeframe depends on maintaining the right environment, including high humidity (80-95%), temperatures around 16-21°C (61-70°F) and proper air exchange. Once pins appear, they can mature into full-sized fruiting bodies within another 5 to 10 days.

Biological products, by their very nature, can be unpredictable and sometimes things don’t go as planned. Growing mushrooms is always a battle against contamination, and sometimes it wins. 

When things go wrong, don’t worry. We offer replacements for contaminated kits or substrates as our guarantee.  

Ensure the humidity is high by misting two or three times daily or using a humidity chamber. Make sure there's enough airflow by providing proper ventilation. Keep the temperature between 16-21°C (61-70°F) and place the kit in indirect light. If the substrate looks dry, mist more often or soak it briefly and let it drain. Sometimes, it just takes more time, so be patient. Check for any contamination, like mold. If you still need help, contact our support team! 

King Oysters need good air exchange to prevent high CO2 levels, which can cause leggy, deformed growth or no fruiting at all. Ensure your setup has proper ventilation and is misted regularly to maintain optimal humidity. 

Another factor could be temperature. King Oysters typically fruit best in cooler conditions, around 16-21°C (60-70°F). If temperatures are too high, fruiting may be delayed or stalled, causing deformation. Check that all environmental conditions—humidity, FAE, and temperature—are aligned to encourage fruiting. 

Yields can vary substantially based on the genetics of the mushrooms you’re growing, environmental conditions and size of the kit you purchased. Typically, you can expect to grow 1kg+ fresh mushrooms over several flushes from our 1.25kg or 2kg (depending on selection) fruiting blocks. 

If we did not answer any of your questions above, then contact us here. We are always happy to help and look forward to hearing from you.