Skip to product information
1 of 2

Folk Fungi

Blue Oyster Mushroom Grain Spawn

Regular price $30.00 CAD
Regular price Sale price $30.00 CAD
Sale Sold out
Save by mixing and matching grain spawn
10% off (2-4)
15% off (5-8)
20% off (9+)
Skill level
Grow location
Indoor, outdoor
Spawn shelf life
4 months (refrigerated)
Bag weight
1.5 kg
Fruiting temps

Our blue oyster (Pleurotus ostreatus var. columinus) grain spawn is a superb choice for both newcomers and seasoned growers. This variety is fast-growing, quickly producing bluish-grey mushrooms with a rich umami flavour that adds depth to any dish.

These mushrooms are great for indoor growing throughout the year, adapting well to a range of temperatures and thriving in cooler ones. Their hardy nature and need for ample fresh air also makes them ideal for outdoor growing.

Blue oysters are prolific producers, often yielding several large flushes. Notably, they're capable of achieving up to 200% biological efficiency! (200% = 2kg of fresh mushrooms per 1kg of dry substrate).


    To fruit mushrooms, you can mix blue oyster grain spawn into sterilized or pasteurized substrates such as hardwood sawdust, aspen wood chips, and straw. If you've never used grain spawn before, make sure to read a mushroom cultivation book or watch a video tutorial online.


    • Weight: 1.5 kg
    • Hydration rate: 50%
    • Bag: 3 mil polypropylene
    • Filter: .2 micron


    White millet, Pleurotus ostreatus var. columinus mycelium.


    If not used immediately, store the grain spawn in the fridge for up to four months.



    We offer shipping to Canadian addresses through Canada Post and UPS. Shipping costs $20 for orders under $150. For orders $150 or more, shipping is free.

    Local delivery

    We offer local delivery to Winnipeg addresses through Trexity. Delivery costs $7 for orders under $150. For orders $150 and over, delivery is free.

    Processing times