Bulk Substrate
The Best Bulk Mushroom Substrate Online for Home and Commercial Cultivation
Out-Grow provides high-quality bulk mushroom substrate designed for reliable, large-scale results. With over 15 years of professional mycology experience, our bulk substrates are trusted by growers across the country who demand consistent performance and clean, contaminant-free products. Each substrate is carefully pasteurized or sterilized in our professional lab and arrives ready for immediate use.
Why Out-Grow Bulk Substrate is the Industry Standard
Our bulk substrates are produced using premium raw materials, precise formulations, and industrial sterilization equipment. Whether you're growing in jars, bags, or large mono tubs, our substrates are designed for maximum colonization and fruiting success. Unlike low-grade alternatives that often result in contamination or poor yields, Out-Grow bulk substrates deliver dependable results backed by years of field-tested refinement.
The Most Complete Selection of Bulk Mushroom Substrates Online
Out-Grow offers a wide variety of bulk substrates to suit any growing method or mushroom species. Choose from manure-based, wood-based, and grain-based options available in multiple formats and volumes. Our selection includes everything from classic rye grain jars to 25-pound substrate bags, as well as combination products like our All In One Grow Bags and Mega Mix Substrate Jars. Whether you're cultivating oysters, lion’s mane, or other gourmet varieties, we have the right substrate to match your needs.
Professionally Prepared Substrate Ready for Immediate Inoculation
Every substrate product in our bulk collection is fully hydrated, properly sterilized or pasteurized, and packaged in high-quality grow bags or jars for easy use. Our substrates are formulated to deliver strong colonization rates and healthy fruiting conditions straight out of the box. Each unit reflects our commitment to professional standards and real-world growing success.
Trusted by Growers, Educators, and Institutions Since 2010
Growers nationwide rely on Out-Grow for bulk mushroom substrates that perform. Our products are used in classrooms, labs, farms, and home grow setups across the country. With more than a decade of trusted service in the mushroom cultivation industry, Out-Grow continues to set the standard for bulk substrate quality and reliability.
Explore our complete collection of bulk mushroom substrates below and power your next grow with proven, professional-grade materials from Out-Grow.
