Pacific Substrates - Goonie Grains - Mushroom Grain Spawn - Case of 12Designed to meet the needs of all levels of growers by making commercial quality materials available at a lower cost, Pacific Substrates utilizes efficient procedures to create these custom blends of mushroom compost and spawn and bring truly superior products to the market. Industry leading quality includes a 6 month shelf life and top of the line ingredients. All products are packaged in XLS T bags and fully sterilized to ensure successful and non