Blue Oyster Mushroom Mycelium Plug Spawn - 100 Count Grow Blue Oyster Mushrooms on Logs, Stumps & Trees Package includes 100 mushroom plug spawn & detailed instruction booklet Each plug is just 1" long and 5/16 inch diameter First fruiting in 6 to 12 months - Will produce fruitings for several years Blue Oyster Mushrooms (Pleurotus columbinus)