Grain Spawn Bags
The Best Grain Spawn Bags Online
Out-Grow offers the most trusted selection of fully sterilized grain spawn bags for mushroom cultivation. With over 15 years of experience, we provide professional-grade products that outperform homemade alternatives and low-quality imports. Whether you’re growing mushrooms at home, in the classroom, or at a commercial scale, our sterilized grain spawn delivers fast, reliable results.
Why Out-Grow Grain Spawn Bags Are the Industry Standard
Out-Grow produces the highest quality grain spawn bags online. Our products are made in a professional mycology laboratory using industrial sterilization equipment to ensure clean, contaminant-free results. We’ve been supplying mushroom growers since 2010 and are trusted by commercial farms, educators, and at-home cultivators across the country.
Fully Sterilized Grain Spawn Bags Ready for Inoculation
Each Out-Grow grain spawn bag is fully hydrated, sterilized, and ready for immediate use. Many bags include a self-healing injection port and a 5-micron filter patch for clean, efficient inoculation. Our grain spawn bags eliminate the guesswork and risk of contamination, giving growers a reliable foundation for vigorous mycelium growth.
The Largest Selection of Grain Spawn Bags Online
From rye berries and red milo to white milo, oats, popcorn, BRF (brown rice flour), and our exclusive Mega Mix, Out-Grow offers the most comprehensive lineup of mushroom grain spawn bags available. We carry 1lb, 3lb, and 5lb sizes to fit any scale, from beginner grows to commercial inoculation runs. All bags are made fresh and shipped quickly to ensure peak performance.
Backed by Over a Decade of Mycology Experience
With more than a decade of hands-on cultivation experience, Out-Grow has earned a reputation for quality and consistency in the mushroom growing community. Our sterilized grain spawn bags are the product of years of refinement and strict laboratory standards — giving you an edge in every grow.
Click below to browse the internet’s most trusted grain spawn bags for mushroom cultivation.
