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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Garden Oyster (Hypsizygus ulmarius) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use Garden Oyster to inoculate:
Garden Oyster can fruit from grow blocks (sawdust only or sawdust supplemented with bran) indoors or on log stacks outdoors.