Organic Blue Oyster Mushroom Grain Spawn
Skill level | Beginner |
Grow location | Indoor & outdoor |
Spawn shelf life | 4 months (refrigerated) |
Certifications | USDA certified organic |
Bag weight | 6 lbs |
Fruiting temps | 55-75°F |
Our USDA-certified organic blue oyster (Pleurotus ostreatus) grain spawn features a strain that is a fast substrate colonizer. It produces mushrooms with a strong bluish-gray hue, rich umami flavor, and soft meaty texture.
Blue oysters are great for beginners, and as our most productive oyster strain, they are reliable indoor year-round producers. If kept in the right conditions, they will yield substantial first, second, and even third harvests (making them one of the best commercial varieties!)
Blue oyster grain spawn can be for indoor cultivation year round. When used for outdoor cultivation, blue oysters are generally cold tolerant and fruit prolifically in early spring or late fall.
Recommended use:
- Blue oyster grain spawn can be used for indoor production using sawdust or straw or outdoor garden beds using straw or wood chips. It is also ideal for growing in buckets.
- Do not use grain spawn for log inoculation.
- This is not a mushroom grow kit. Blue oyster 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 55-75°F | 13-24°C Humidity (Phase 1: Primordia) 95-100% Humidity (Phase 2: Fruitbody) 85-95% CO2 Sensitivity (Phase 1: Primordia) <1,000 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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Oyster mushroom grain spawn can be mixed into sterilized or lime pasteurized substrates including but not limited to hardwood sawdust, straw, and coffee grounds.
Note: Grain spawn must be mixed with bulk substrate before you can fruit it. If you are new to growing mushrooms, we recommend purchasing a book on mushroom cultivation.
Recommended reading:
'Growing Gourmet and Medicinal Mushrooms' by Paul Stamets
'Organic Mushroom Farming and Mycoremediation' by Tradd Cotter
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Oyster spawn can be spread in chopped straw or wood chips as shown in the video below! Making outdoor beds is one of the easiest methods for growing any type of oyster mushroom.
For our complete mushroom beds pamphlet, click here.
Be sure to use clean, untreated products when making outdoor beds.
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If you don't plan to use immediately, you can refrigerate your spawn for up to 4 months.
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Blue oyster mushrooms can easily replace button mushrooms in most recipes and pair well with many cuisines and flavors. Like all oyster mushrooms, they retain water and may develop a viscous texture when under-cooked. If you prefer a firm or dryer texture, continue to cook Oysters until their liquid has reduced and cooked off and they begin to brown.
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Our grain spawn is USDA certified organic and made using organic cultures from our own culture bank. It contains a blend of locally sourced, organic, and non-GMO ingredients from farms in New England and North America.
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If you’re going to consume home-grown mushrooms, make sure to cook your fresh mushrooms thoroughly with heat. If it is your first time eating this species, it is best to start with a small amount to check for allergies, even if cooked.
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- Reviews
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Awesome Spawn From North Spore
This is awesome spawn that is vibrant and fast colonizing in whatever medium I use, straw, sawdust doesn't matter.Thank you North Sproe not buying from anyone else.
North Spore
Thank you so much for the awesome review, James!
Fully colonized and has continued to produce results
The grain spawn arrived fully colonized and ready to use. I have inoculated several bags from this purchase and all have had vigorous spawn runs and produced solid fruit. I am somewhat new to mushroom growing and have only recently learned there are warm and cool strain blue oysters. As I live in a hot climate, I was curious to see I could find out what strain these might be and see if that could help me fine tune my environment. These are an excellent regardless of the strain and I will continue to purchase form North Spore. Thank you!
North Spore
Thank you so much for the thorough review, Matthew. We so appreciate it. Reach out if you ever need anything!
Good
Good
North Spore
Good luck with your grow, Sufang!
Blues
Proven winner. More than one flush.
North Spore
We're happy to hear it! Thanks for your review, Holly.
Blue Oyster spawn
I am so excited! I gently pulled the mulch and there is so much mycelium growing! This is my first time trying to grow outside. By the look of it we will be getting mushrooms. Thank you for the magic you made!
North Spore
Thank you so much for your review, Marilyn! Enjoy your blue oysters!