Organic Shiitake Mushroom Grain Spawn












Skill level | Intermediate |
Grow location | Indoors |
Spawn shelf life | 4 months (refrigerated) |
Certifications | USDA certified organic |
Bag weight | 6 lbs |
Fruiting temps | 55-70°F |
Our USDA-certified organic Shiitake (Lentinula edodes) grain spawn features a popular strain that produces light brown, medium-to-large, umbrella-shaped caps. Shiitake mushrooms are a delicious edible fungus from East Asia and their flavor is described as rich, savory, buttery, and umami.
This strain tends to produce generous flushes, making them a great mushroom for confident beginners. They colonize quickly and are the most reliable producers of any species, which is why they are ideal for commercial cultivation.
"5 of the Best Shiitake Mushroom Recipes"
Recommended use:
- Shiitake grain spawn can be used for indoor production using sawdust or straw.
- Do not use grain spawn for log inoculation.
- This is not a mushroom grow kit. Shiitake grain spawn must be combined with a substrate in order to fruit.
Upon receiving your spawn:
Remove it from the shipping box as soon as possible. Then, unfold the top of the bag, making room for air space. It's also important to check and confirm that the filter patch is not obstructed. This will help the organism breathe and continue to thrive!
Scroll down for specifications, growing, and storage guides.
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- Weight: Approximately 6 lbs
- Hydration: Average of 47%
- Bags: Gusseted 2.2 mil polypropylene
- Filter: High efficiency .2 micron
- Inoculation Rates: 6 lb. bag of grain will inoculate between 120-165 lb. sterilized sawdust, and 100-130 lb. pasteurized straw
- Sterilization method: Commercial grade autoclave sterilized
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Temperature 55-70°F | 13-21°C Humidity (Phase 1: Primordia) 95-100% Humidity (Phase 2: Fruitbody) 85-95% CO2 Sensitivity (Phase 1: Primordia) 500-700 ppm CO2 Sensitivity (Phase 2: Fruitbody) <1,000 ppm - Primordia - The earliest recognizable stage of fruitbody development. Also known as “baby mushrooms” or “mushroom pins.”
- Fruitbody - A fully grown mushroom, the reproductive structure of the organism in which the spores are produced.
- CO2 sensitivity - When CO2 levels are too high, yields will decrease, stems will become long and stringy, caps will be small, and/or growth will halt.
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Shiitake mushroom grain spawn can