Bulk Substrate
Price range: $24.95 through $74.95
Pasteurized, nutrient-rich, and ready for big yields.
Each 5 lb block of CVG substrate is prepared by professional mycologists using a precise blend of coco coir, vermiculite, and gypsum, giving your mushrooms the perfect foundation for fast colonization and heavy flushes.
About The Product
Expertly Prepared Quality
Every batch is meticulously pasteurized, ensuring a clean environment while keeping beneficial structure and nutrients intact. The result: strong, consistent growth without the guesswork.
Long-Lasting & Clean
Unlike manure-based substrates, our eco-friendly CVG mix is odor-free, mess-free, and shelf-stable for 6+ months when stored properly—making it easy to keep on hand until you’re ready to grow.
What’s Inside the Blend
- Coco Coir – Made from coconut husk fibers, coco coir is airy, holds moisture well, and gives mycelium plenty of room to spread.
- Vermiculite – A natural mineral that expands when heated. It locks in water and keeps the substrate fluffy so it doesn’t compact.
- Gypsum – A source of calcium and sulfur that balances pH, prevents clumping, and strengthens overall structure for healthy colonization.
Together, these three ingredients form the industry-standard CVG recipe trusted by growers worldwide.
Versatile Across Species
Whether you’re cultivating gourmet or medicinal mushrooms, this substrate is the reliable choice for monotubs, shoeboxes, or bag setups—delivering dense colonization and abundant harvests.
Simple to Use
- Break up the 5 lb block.
- Mix in your fully colonized grain spawn.
- Pack into your monotub, shoebox, or grow bag.
- Allow colonization, then fruit for multiple flushes.
No complicated prep. No hassle. Just results.
Satisfaction Guarantee
We stand by our substrate 100%. If your product arrives damaged or defective, we’ll replace it—no questions asked.
Customer Reviews
Bulk Substrate
| 5 star | 60% | |
| 4 star | 40% | |
| 3 star | 0% | |
| 2 star | 0% | |
| 1 star | 0% |
This grow bag worked flawlessly. From inoculation to fruiting, everything went just like it should. Watching the mushrooms pop up day after day was actually really satisfying.
Reliable flushes always
This substrate held up really well. Colonized evenly and by the time I was ready to fruit, everything came in strong. Pulled a good harvest across two flushes.
Moisture held perfect
I was hesitant about trying bulk substrate but it turned out great. It colonized evenly and held up really well during fruiting. Ended up with two flushes that gave me more mushrooms than I thought possible. Definitely worth using again.