Plug Spawn - White Oyster Mushrooms100 White Oyster mushroom plug spawn and detailed instructions. Use to colonize stumps and logs, and produce gourmet oyster mushrooms for many years. White Oyster mushrooms are extremely healthy including very high in protein, and many excellent benefits for the immune system. Note: Use the plug spawn within 2 weeks of receiving, or place in a refrigerator for up to 6 months. Make sure the spawn does not freeze. Mushroom Mojo White Oyster Plug Spawn