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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
King Oyster (Pleurotus eryngii) rye grain spawn. This is made as a custom order and is available by the kilogram.
You can use King Oyster to inoculate:
King Oyster is best grown indoors on sawdust fruiting blocks.
Species overview in our library: https://www.fungiakuafo.com/library/king-oyster-pleurotus-eryngii/