Organic Blue Oyster Mushroom Grain Spawn
|Grow location||Indoor & outdoor|
|Spawn shelf life||4 months (refrigerated)|
|Certifications||USDA certified organic|
|Bag weight||6 lbs|
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.
- Blue 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. 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.
- 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
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.
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.
'Growing Gourmet and Medicinal Mushrooms' by Paul Stamets
'Organic Mushroom Farming and Mycoremediation' by Tradd Cotter
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.
If you don't plan to use immediately, you can refrigerate your spawn for up to 4 months.
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.
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.
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.
You may also like
Thank you for submitting a review!
Your input is very much appreciated. Share it with your friends so they can enjoy it too!
All around good product
The north spore never disappoints me they always produce bey high quality’s products and very reliable and helpful customer service. The blue oyster grain so spawn is my favourite product they have some of the best genetics I’ve ever seen. Highly recommend.
Thanks, Nicholas! We couldn’t do it without customers like you.
First time using spawn grain Blue Oyster
Since I am just getting into growing mushrooms as a hobby and food supply, the grain spawn really made my effort pay off. I have tried various media with the spawn from straw, straw/coffee grounds and carboard/coffee grounds as media in plastic bags. Great results with the straw and carboard/coffee. I have two plastic milk carton bins with straw media that appears well colonized. Hope to see Blue Oysters there soon
Thanks for sharing, Briggs! We appreciate you taking the time to share your experience.
Loving the blue
I set up buckets for the blue oyster grain spawn. Within 3 weeks I had two large flushes. Waiting for more. Very happy with these.
Thanks for the great review, Shari! The team is here to help if you ever need anything.
Love these Blues
I started growing Blues about three years ago and they were my first mushroom I ever grew. My most recent harvests off of sterilized straw buckets have been crazy. I had 6 clusters that were 10+ oz each.
Your grow looks amazing, Tallia! We’re so happy you’re enjoying the experience.
The best flushes yet!
I made some buckets and check out the clusters! This was after about 5 days in the grow tent at 75-80% humidity. This was the biggest cluster I've seen in my three years of growing. Awesome grain spawn and very nicely colonized upon delivery. Love Northspore's grain spawn and will always come back for more!