Bulk Mushroom Substrate – Pasteurized Coco Coir, Vermiculite & Gypsum Blend
Bulk Mushroom Substrate – Pasteurized Coco Coir, Vermiculite & Gypsum Blend
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$18.99 USD
Regular price
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$18.99 USD
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Our bulk mushroom substrate is pasteurized, hydrated to field capacity, and ready to use straight out of the bag. Mix it with your colonized grain spawn in a monotub, or fruit right in the bag.
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What's inside
- Coco coir, vermiculite and gypsum: a proven base that holds moisture and supports healthy mycelium growth.
- Azomite and worm castings: added minerals and nutrients for strong colonization and fruiting.
Details
- Pasteurized and hydrated: no soaking, mixing or measuring water.
- Two sizes: 3 lb or 5 lb.
- Grows two ways: use in a monotub or grow bin, or mix and fruit right in the bag.
- Filter-patch bag: heat-sealed bag with a 0.5 micron filter patch for gas exchange.
- Made fresh: every bag is made fresh and shipped to your door.
How to use
- Mix: combine the substrate with your colonized grain spawn (not included) and mix evenly. Most growers use 1 part grain to 1–3 parts substrate. For example, a 5 lb bag of substrate pairs with about 5 lbs, 2.5 lbs or 1.7 lbs of grain.
- Colonize: keep it covered in a warm, dark spot (70–75°F) for about 3 weeks, until fully colonized.
- Fruit: fruit in your monotub or directly in the bag.
Using a grow bin? Clean and sanitize the bin first, then mix in the substrate and grain spawn as above.
Note: This product contains no mushrooms, spores, or mushroom culture. It is a growing medium for home mushroom cultivation.

