Our Rye Berry Mushroom Substrate Grain Bags are perfect for cultivating a wide variety of mushrooms. This bulk pack contains 5 x five-pound bags of fully hydrated and sterilized rye berries, ready for inoculation. Rye berries provide an ideal substrate for mushroom spawn, offering excellent moisture retention and a nutrient-rich environment that supports strong mycelium growth. Whether you're scaling up for a commercial grow or looking to maximize production at home, our bulk rye berry grain bags offer both quality and value.