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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Reishi (Ganoderma lucidum) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use Reishi to inoculate:
Reishi is best grown indoors on sawdust fruiting blocks. We have successfully fruited Reishi in our greenhouse in the summer.
This mushroom needs to be dried and is used as a medicinal mushroom.