50/50 Straw & Horse Manure Mushroom Substrate – 25 lbs Bulk Pack

Grow thriving mushrooms with Out-Grow’s premium 50/50 Straw and Horse Manure Mushroom Substrate. This expertly blended mix contains 50% nutrient-rich horse manure compost and 50% golden wheat straw, providing the ideal balance of nutrition and aeration for dung-loving mushroom species.

Product Details:

✔ Includes 5 x 5-pound bags – Perfect for bulk cultivation.
✔ Sterilized & Ready to Use – No prep required, just add your spawn.
✔ Optimized for High Yields – Superior to grain-only substrates or all-in-one grow bags.
✔ Versatile Fruiting Options – Use directly in the bag or transfer to trays, tubs, or bulk grow setups.
✔ Premium Ingredients – Made with field-aged horse manure, golden wheat straw, coconut coir, and vermiculite, ensuring optimal moisture retention and aeration.

Out-Grow’s mushroom substrate grow bags are designed to maximize colonization and fruiting potential, giving you a high-performance, nutrient-dense base for growing a variety of dung-loving mushrooms. Whether you're growing in bulk or experimenting with new species, this 50/50 compost mix provides the perfect foundation for vigorous growth and large, healthy fruiting bodies.

Get your mushroom grow bags today and experience the difference of Out-Grow’s premium bulk substrate!