100% Straw Pulp Mushroom Substrate Grow Bag (2.5 lb)
100% Straw Pulp Mushroom Substrate Grow Bag (2.5 lb)
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Warranty & Refund Policy
Warranty & Refund Policy
Substrate Warranty and Refund Policy
Within the first 30 days of placing your order we guarantee that your substrate product is free from defects or we will replace it and ship the replacement product for free. If the product has been already been used we will issue a store credit only for product purchase price minus a 20% processing fee. Shipping fees and sales tax are non-refundable.
To file a claim please take at least 3 close up photos of the injection port and each bag or jar showing us the issue so we can review your claim. We offer replacement products only on defective or damaged products. No need to return products.
Straw Substrate Tips
Straw Substrate Tips
Colonization times can vary widely depending on the species. However straw is the fastest colonizing substrate available so it should colonize pretty fast, much faster than wood based substrate. If you’re a beginner and prefer a faster, more rewarding first grow, consider starting with Pink Oyster Mushrooms. Depending on the species and the viability of your liquid culture, full colonization can take up to 1 1/2 months.
User Guide
User Guide
Download our wood/straw grow bag guide here.
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SKU: SKU:strawsub2.5
New Item
These pasteurized 2.5 pound straw pulp mushroom grow bags are perfect for cultivating Oyster and Lion’s Mane mushrooms. Made from 100% ultra-fine, additive-free straw, the substrate is finely milled to prevent sharp stems from puncturing the bag and is known for its fast colonization speed.
Each bag includes a self-healing injection port and a 0.5-micron air/gas exchange filter, and is double-sealed for freshness and durability.
Prep kit included: nitrile gloves, alcohol swabs, and a face mask.
Straw is one of the fastest-colonizing substrates for gourmet mushrooms, making it an ideal choice for Oyster and Lion’s Mane cultivation. Its soft, porous structure allows mycelium to spread quickly and evenly, leading to strong, vigorous growth. Straw also provides excellent moisture retention and aeration, helping produce dense, healthy flushes with minimal effort—perfect for both beginners and seasoned growers.
