The Best Mushroom Substrates Online
Mushroom Substrates Made by Professional Mycologists Since 2010
Out-Grow offers the largest and most trusted selection of mushroom substrates available online. Since 2010, we’ve produced thousands of pounds of premium mushroom substrates every week in our industrial facility, ensuring consistent quality, proper sterilization or pasteurization, and proven results for mushroom growers of all levels.
All of our mushroom substrates are professionally formulated by experienced mycologists to deliver optimal performance and consistent colonization. Whether you're cultivating gourmet or medicinal mushrooms, your success starts with the right mushroom substrate — and ours are made with precision, care, and deep knowledge of fungal biology.
Fully Prepared and Ready-to-Use Mushroom Substrates
Every mushroom substrate we sell is fully hydrated, sterilized or pasteurized, and ready to use right out of the bag or jar. This saves you hours of work and eliminates the risk of contamination that often comes with preparing mushroom substrates at home. Our mushroom substrates are clean, consistent, and designed to promote fast, aggressive mycelial growth.
The Widest Selection of Mushroom Substrates Online
We offer a complete range of mushroom substrates including sterilized grain spawn bags such as rye, milo, oats, and popcorn. You’ll also find wood-based mushroom substrates for species like Lion’s Mane and Reishi, and manure-based mushroom substrates for species like Agaricus and Psilocybe. We carry all-in-one mushroom grow bags that combine grain and mushroom substrate layers in a single sterilized unit, as well as mushroom substrate jars with injection ports. Out-Grow also supplies casing soil and core mushroom substrate ingredients like coir, vermiculite, gypsum, and straw.
Why Out-Grow Mushroom Substrates Are the Best Choice
Out-Grow has been producing high-quality mushroom substrates for over 15 years. Our mushroom substrates are made by professional mycologists in a clean, controlled environment and are pressure sterilized or pasteurized to ensure they are contamination-free. They are carefully packaged and shipped to maintain integrity and deliver reliable results. Our proven track record and long-standing reputation in the mushroom community make us a trusted name in mushroom substrate production.
Order Mushroom Substrates with Confidence
When you order from Out-Grow, you're not just buying mushroom substrates — you're getting a proven product backed by expert support. Our mushroom substrates are designed to help you succeed, whether you’re a beginner or running a commercial grow. Simply choose the type that fits your setup, inoculate, and let the mycelium do the rest.
Explore the categories below to find the perfect mushroom substrates for your next cultivation project.
Click a link below to be taken to the best mushroom substrate selections online.
