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Mushrooms do not fruit from grain spawn. Instead, grain spawn is used to inoculate a fruiting substrate.
Yellow Oyster (Pleurotus citrinopileatus) rye grain spawn. This is made as a custom order to ensure quality.
You can use Yellow Oyster to inoculate:
Yellow Oyster can fruit from grow blocks indoors or straw bags outdoors. Yellow oyster is a warmer climate species.
Species overview in our library: https://www.fungiakuafo.com/library/yellow-oyster-pleurotus/