Organic Snow Oyster Mushroom Grain Spawn












Skill level | Beginner |
Grow location | Indoors & outdoors |
Spawn shelf life | 4 months (refrigerated) |
Certifications | USDA certified organic |
Bag weight | 6 lbs |
Fruiting temps | 45-65°F |
Our USDA-certified organic Snow Oyster (Pleurotus ostreatus) grain spawn features a popular strain that produces firm caps with a sweet flavor and aroma that holds its shape when cooked. The taste of snow oyster mushrooms is very mild, and some even describe it as slightly woody and earthy. Snow oysters are great for confident beginners and are reliable indoor year-round producers. If kept in the right conditions, they will yield substantial first, second, and even third harvests (making them an ideal commercial variety!)
Snow oyster grain spawn can be used for indoor cultivation year round. When used for outdoor cultivation, snow oysters will fruit in the cooler months.
Recommended use:
- Snow oyster grain spawn can be used for indoor production using sawdust or straw or outdoors 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. Snow 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 45-65°F | 7-18°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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Snow Oysters 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 undercooked. If you prefer a firm or dryer texture, continue to cook them 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 grains and supplements 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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Snow Oyster Review
The product came packaged well. I innoculated my masters mix substrate, and the bag grew in very well, however I have not been able to get it to pin. It is a beautiful mushroom, and seems that it should be easy to grow, but I cannot get it to pin. It is in a fruiting tent with average humidity of 95%, and avg temperature of 64 deg F.
North Spore
Thanks for sharing, Michael! Somebody from our team is reaching out to you via email now to assist you.
Mind. Blown.
1st off, any problems iv had with anything iv gotten from here has been handled very professionally but I really came to say somthing about this grainspawn. I bought this grainspawn 2 years and expanded it to bulk right as I got it. After the blocks were done producing I moved them to my deck and they sat for year(I'm lazy leave me alone). Then I moved them to my Shed and they sat another year. After 2 years of not being in fruiting conditions and going through intense heat through the summer and bitter cold in the winter. I had 4 blocks produce 1 more time in my shed. After 2 years! I got 2 lbs off of them. Blew my freaking mind. Still tasty to

I love it
I ordered twice from this company, the first time I ordered was pink oyster spawn and the fruiting was amazing! I ordered a second which is this one, snow oyster, with two other type of spawns and some of it have finally fruit now. They gave a lot of spawn as well. The ship time is a little slow, but I guess it takes time to make the spawn and have it ready to ship out. My advice is order it a month before when you grow it.

Snow oysters
The spawn arrived when expected and as described. The weather in NYS was a bit cold so I had to store the spawn in my refrigerator for two weeks. The snow oyster mycelium was already growing in the bag before I could get it into my straw bed. I hope to be enjoying mushrooms in three months. I have other cultures in stump, logs and winecaps in wood chips. I am new to this and only got a few mushrooms from the log culture \in the first year but am hopeful that I will harvest a bounty this summer.

Perfect for outdoor beds in early spring
I must admit, this is pretty exciting stuff. This is my first time growing mushrooms outdoors in beds and this has been a really fun experience. The spawn arrived perfectly. They send you a good 5-6lbs so you get lots to experiment and play with. I’m in zone 9, with mild winters, and this beautiful grain spawn has gone directly into shady garden beds with straw. When your spawn arrives, they include all the info you need for how to store it until it’s ready for use. I can’t wait to order wine cap spawn next.