Colonized Grain Spawn (15lbs)

Each order comes with (5) 3lb bags [15lbs total per order]

Grow Mushrooms at Home or at Scale—19 Varieties Available

Our lab-crafted grain spawn is made with a sterile blend of  non-GMO red sorghum (milo) and limestone (calcium carbonate) colonized by active mycelium for reliable and productive mushroom cultivation. Choose from 19 popular varieties, including Lion’s Mane (Hericium erinaceus), Turkey Tail (Trametes versicolor), Blue Oyster (Pleurotus columbinus), Shiitake (Lentinula edodes), Chestnut (Pholiota aurivella), and many more. Whether you’re a hobbyist grower or scaling up for commercial production, our spawn is ready to help you start your next flush.

Each 3lb grain spawn block is made in-house in our Baltimore mycology lab, using trusted cultures and methods to ensure vigorous, fast-colonizing results. Just pair with a bulk substrate in a sterile environment, and let the mycelium do the rest.

📦 Ships fresh, fully colonized, and ready for use.

🌱 Store up to 3 months in refrigeration (41°F) if not using immediately. ***EXCEPT Pink Oyster which should never be refrigerated; store this strain in cool area (60-70F) in complete darkness up to 4 weeks.

🔍 Not a mushroom grow kit. Substrate required.

Suggested Use

• Intended for indoor mushroom growing using sawdust or wood-based sterilized substrates.
• Not recommended for log inoculation or direct garden use.
• Ideal for: mushroom farmers, DIY cultivators, and educational labs.

Upon Arrival

1. Remove from shipping box immediately.
2. Grain spawn will arrive double-bagged for added protection. Open the top of the outer bag (or remove the outer bag) to allow airflow and ensure the filter patch is unobstructed.
3. Leave at room temperature if using within a couple of days.
4. If not using right away, store in the refrigerator (up to 3 months). ***EXCEPT Pink Oyster which should never be refrigerated; store this strain in a cool area (60-70F) in complete darkness up to 4 weeks.

📖 Want tips, recipes, and more?

Check out our grow blogs and mushroom recipes for detailed cultivation advice, information on medicinal benefits, and culinary inspiration.

🛒 Bulk discounts available for commercial growers and educators.

For large orders, wholesale pricing, or mycological support, email: sales@baltispore.com