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    Elm Oyster Grain Spawn Bag

    Elm Oyster Grain Spawn Bag

    £12.95 GBP
    £12.95 GBP
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    • FREE DELIVERY ON UK ORDERS £50+
    • LIFETIME GUARANTEE

    Our Blue Oyster (Pleurotus ostreatus) Mushroom Spawn Bag is made from a high-yielding G1 master culture strain, specially designed to yield thick, dense and delicious mushrooms with ease. The spawn comes ready to mix with substrate, meaning there’s no need to faff around inoculating and colonising your own grain; you can get straight to the fun part! The ease of use makes it perfect for both hobbyists and small-scale commercial growers. 

    With our specifically selected high-yielding genetics, you can expect large harvests of up to 300g+ of mushrooms per kg of substrate. 

    🍄 Lab tested, high-quality living grain spawn, perfect for inoculating substrates 

    🌱 Compatible with a range of substrates and growing methods 

    🧬 Specially selected strains optimised for high yield, nutrient density and flavour 

    🗓️ Harvest mushrooms quickly within 3 weeks  

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

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

    View full details

    • EASY TO USE

    • MASSIVE YIELDS

    • SET & FORGET

    • SAVE MONEY

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    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
    • High yielding millet and milo substrate blend
    • Rapid colonisation times
    • Simple 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 Blue Oyster Mushroom Grain Spawn Bag doesn't include spores or liquid culture, as it is already pre-colonised with Blue Oyster mycelium and ready to spawn with substrate. 

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

    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 Blue Oyster Mushroom Grain Spawn Bag soon after receiving it. If you are not using right away, store the bag in the fridge. Stored this way, your spawn should last at least 3 months.

    Please refer to delivery details.

    Blue Oyster mushrooms typically take about 1 to 2 weeks to start fruiting from a fully colonised block, provided the conditions are optimal. This timeframe depends on maintaining the right environment, including high humidity (80-95%), temperatures around 15-20°C (59-68°F), and proper air exchange. Once pins appear, they usually take 4 to 7 days to develop into full-sized fruiting bodies, with the blue-grey caps turning lighter and flattening as they mature.

    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 once or twice daily or using a humidity chamber. Make sure there's enough airflow by providing proper ventilation. Keep the temperature between 15-25°C (59-72°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. You can also try cutting a small “X” in the side of the bag for side fruiting. Check for any contamination, like mold. If you still need help, contact our support team!

    Blue Oysters are very sensitive to high CO2 levels. If there isn’t enough FAE, they may not fruit at all or produce long, thin stems with small caps. 

    Ensure your setup has proper humidity, regular misting, and enough airflow to reduce CO2 buildup. Adjusting these factors should encourage fruiting. 

    Yields can vary substantially based on the genetics of the mushrooms you’re growing, environmental conditions and amount of substrate you are using. Typically, you can expect to grow 750g+ fresh mushrooms over several flushes from a 1.5kg spawn bag.

    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.