Mushroom Substrate
The Industry Leader in Mushroom Substrate Since 2010
Out-Grow has been producing premium mushroom substrates for over 15 years, earning a reputation as one of the most trusted names in the industry. We manufacture thousands of pounds of mushroom substrate every week in our professional facility, using high-grade materials and sterile procedures. Every substrate bag we sell is formulated by experienced mycologists to ensure reliable results and maximum yield.
Fully Prepared Mushroom Substrate — Sterilized or Pasteurized and Ready to Use
Each mushroom substrate in this collection arrives fully prepared and ready to use—no need to mix, hydrate, or sterilize anything yourself. Whether you’re working with sterilized manure-based substrates, pasteurized straw, or a balanced 50/50 blend, our products provide the perfect foundation for successful mushroom cultivation. We take the guesswork and labor out of preparing substrate, so you can focus on growing.
Why Out-Grow Mushroom Substrates Are the Best Choice
We use only the highest quality ingredients in every substrate product—no fillers, no shortcuts. Our substrates are carefully blended, hydrated, and processed under strict sterile or pasteurized conditions, depending on the product. This ensures maximum colonization speed and reduces the risk of contamination. Our packaging process uses commercial-grade mushroom grow bags that maintain substrate integrity during shipping and storage.
Solve Common Grower Problems with Proven Substrate Solutions
Struggling with contamination, poor colonization, or low yields? The root of these issues often lies in the substrate. Out-Grow’s mushroom substrates solve those problems by giving your mycelium exactly what it needs: clean, nutrient-rich material with the right consistency and moisture content. Growers choose Out-Grow because they want results they can count on.
Click below to view the top mushroom substrate products online — from manure-based blends to straw and casing mixes — all backed by over a decade of proven performance.
