Elm Oyster Spawn
Elm oyster (Hypsizygus ulmarius) is a brilliant mushroom for growers who want large, firm caps that last well after picking. This elm oyster mushroom grain spawn is a 1.5kg bag of millet and milo grain, fully colonised and ready to spawn.
What Is Included
- 1 x 1.5kg elm oyster grain spawn bag
- Access to our online growing guide
Best Substrates
Elm oyster grows on hardwood sawdust, pasteurised straw and wood chip. It is also one of the best species for outdoor mushroom beds. Mix the spawn into a shady bed of hardwood chips and you can get flushes in the garden for a couple of seasons.
How to Use
- Break up the grain in the bag.
- Mix into substrate at 10 to 20 percent spawn by weight.
- Incubate at 20 to 24°C in the dark.
- Fruit at 15 to 22°C with high humidity, indirect light and fresh air.
Why Grow Elm Oyster?
True oysters drop a lot of spores, which can bother some people indoors. Elm oysters drop far fewer. They also keep much better in the fridge, which is handy if you are growing to sell.
Storage
Store in the fridge for up to two weeks if needed and allow to warm before use.
Related
See our elm oyster fruiting block, elm oyster liquid culture and bulk elm oyster spawn. More in mushroom grain spawn.

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