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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Black Pearl (Pleurotus ostreatus hybrid) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use Black Pearl to inoculate:
Black pearl is best grown indoors on sawdust fruiting blocks. We have successfully fruited Black pearl in our greenhouse in the summer.