Premium Sterilized 5-Grain Mushroom Spawn Bags with Injection PortsPremium 5 Grain Spawn Bags (2 Pack) Our multi grain spawn bags are the ideal choice when size, quantity, and potency of the mushrooms matter. We use a combination of nitrogen rich grains like rye and milo to provide your mushrooms with multiple dense flushes. While the exact ratio is our secret, we start with organic rye berries as our base and add four other specially chosen grains, including red sorghum, white sorghum, millet, and red winter wheat