Golden Oyster Grain Spawn Our Grain Spawn Is Grown On 100% Certified Organic Rye Berries. It Arrives Contaminate Free, Fully Developed, And Ready To Use. Grain Spawn Is Used To Inoculate Many Bags Of Bulk Substrate Quickly, And Is The Choice Methodology For Medium And Large Scale Growers. Simply Break Up The Grain Spawn Well, Then Transfer Some Grains To Each Bag You Want To Inoculate. Golden Oyster Mushroompleurotus Citrinopileatus, The Yellow/Golden Oyster Mushroom (Tamogitake In Japanese), Is An Edible Gilled Fungus. Native To Eastern Russia, Northern China, And Japan, The Golden Oyster Mushroom Is Very Closely Related To P. Cornucopiae Of Europe, With Some Authors Considering Them To Be At The Rank Of Subspecies. In Far Eastern Russia, P. Citrinopileatus, They Are Called Ii’Mak, Is One Of The Most Popular Wild Edible Mushrooms. Environment Information Incubation Temp: 78-81 F Incubation Humidity: 80%-83% Incubation Time: 11 Days Fruiting Temp: 71-78 F Fruiting Humidity: 90%-93% Fruiting Time: 14 Days