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Organic Blue Oyster ‘Spray & Grow’ Mushroom Growing Kit












Skill level | Beginner |
Grow location | Indoors |
Grow speed | 2 weeks |
Certifications | USDA certified organic |
Kit shelf life | 6 months (refrigerated) |
Kit dimensions | 10in H x 5in W x 5in D |
Kit weight | 4 lbs |
Why we love them:
Blue oyster mushrooms are velvety, savory, and mild and pair perfectly with just about any recipe! Blue oysters are a staple here at North Spore (going all the way back to when we began as an urban farm.) After perfecting our blue oyster kits over the years, they’ve become one of the easiest kits to get multiple fruitings from and should produce a second flush of mushrooms (or more!)
Our USDA-certified organic blue oyster mushroom kits are reliable producers and tend to yield large flushes of beautiful light grayish-brown to deep blue-gray mushrooms when given adequate humidity. With continued proper care, you should be able to get multiple flushes. (We 100% guarantee your first flush of mushrooms, but hope you'll try for 2 or 3!)
That's not mold, it's mycelium!
Your kit includes an amended sawdust block fully colonized with mushroom mycelium. It may appear covered with a soft, white, mold-like substance - that's the mushroom mycelium! It is completely normal. The mycelium of some species is more prominent than others.
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Click here to download PDF of instruction booklet
1) Inside this box is an amended sawdust block that has been completely colonized by mushroom mycelium. Open the front of your kit along the perforated line and dispose of the remaining cardboard.
2) Slice an 'X' into the plastic underneath with a sharp knife or scissors.
3) Lift open the top of your box to find the sprayer and instruction booklet. Fill the sprayer with tap water and generously spritz the plastic where you sliced your 'X' shape. Spritz your kit at least twice daily - more if you're in a particularly dry climate. (If your mushrooms start to grow but dry up and die, your growing conditions may be too dry and you should make a humidity tent!)
4) Place your kit in the most humid part of your home and outside of direct sunlight. We suggest putting it on a kitchen counter close to a sink. The mushroom mycelium will sense the oxygen in the air and produce mushroom 'pins,' another term for 'baby mushrooms.'
5) It usually takes 5-14 days for pins to form. Once pins begin to form, mushrooms will grow quickly. So when you spot your first pins keep an eye on them. The warmer the environment the faster they will grow. Mushrooms should be ready to harvest 2-5 days after pin formation.
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If you're not ready to use immediately, your Blue Oyster Spray & Grow Kit can be refrigerated or stored in a cool dry place, out of direct sunlight, for up to 3 months.
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The classic North Spore recipe is to chop the blue oyster mushrooms and sauté them in a heavy pan on medium heat with butter, garlic, and loads of fresh thyme and rosemary (or whatever other herbs you happen to have on hand!). Cook until the mushrooms have released their liquid, then continue cooking until that liquid has cooked off and the mushrooms begin to brown. This can take from 20-30 minutes. Deglaze your pan with a splash of white wine, reduce once more, and finish with a touch of heavy cream. Season generously with salt.
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USDA Certified Organic
The spawn used in our mushroom kits is grown on organic grain and made with organic cultures from our own culture bank. Our kits are handmade from a blend of non-GMO woods and supplements from farms and forests in New England and North America.
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Simply take a trash bag or other loosely fitting plastic bag and put PLENTY of 1/2 inch holes in it (THIS IS IMPORTANT: Mushrooms exhale CO2 and inhale oxygen. They will suffocate themselves if there isn’t adequate airflow! Blue oysters that look stringy or strange are usually growing that way because they need more air!). Spray the slice at least once per day with the included spray bottle. If you choose to use a humidity tent make sure to spray the inside of the tent once per day to maintain humidity.
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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.
Mushrooms grow spores as they develop. This is a natural means of reproduction. This is when people with allergies or compromised immune systems may want to consider putting fruiting mushroom kits outdoors or in a well-ventilated area. Spores in mushrooms sometimes cause respiratory irritation. In rare cases, spores may also cause irritation for some non-allergic or non-immunocompromised mushroom growers. If you are one of them, it is recommended to reduce the overall spore load by harvesting mushrooms while they are still in their younger growth stages.
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- Reviews
- Questions
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Your input is very much appreciated. Share it with your friends so they can enjoy it too!

John's Review
Instructions were very well written and easy to understand. Compact design and packaging is good. Good choice for a beginner mushroom grower. I rate overall experience 5 stars!!
North Spore
Thanks for the great review, John! We're so glad you enjoyed the experience.

Blue Oyster Spray and Grow Kit
Easy as advertised. I had my kit for maybe a week or ten days before I had to go on vacation, so I boarded them at my brothers. The day after I left they started pinning and flushed out. I was disappointed that I didn't get to witness the fattening. I instructed my brother to harvest and dry for me. When I got back I took the dried out kit home and resumed spraying. To my delight I got a second flush! So dang cool. The ideal beginner kit to get started with or to gift in the interest of piquing the interest of the pinning mycophiles, home cooks, and nerds of all stripes.
North Spore
Thanks so much, Zach! We really appreciate the great review.

Leaping Mushrooms
Outstanding! As an absolute novice, I expected to need to babysit and worry as the mushrooms sloooowly appeared. Nope! They are right. A few single sprays and a rapid bloom of flavor and mushrooms. I used some fresh for cooking and the rest were easily dried for adding flavor and interest to soups. I will definitely buy more.
North Spore
Thanks for sharing, Liz! We appreciate you taking the time to share your experience.

Spray and grow
So cool, my first time growing mushrooms after searching for them in the wild for decades! I didn't think my blue oysters were going to grow but I moved them and bam!
North Spore
Thanks for sharing, Charles! We appreciate you taking the time to share your experience.

First grow success
Good.. I had to be patient but suddenly there were mushrooms - and then again and even a third time. I was encouraged enough to up the game and buy grow chamber. Stand by for results on that
North Spore
Thanks for sharing, Jim! If you need help with anything, please reach out.

Wow!
I thought I’d get some Blue Oyster Mushrooms. I was wrong. I got so many I could not believe it. They literally grew when you left the room. Once harvested all of them, I thought I’d spray and hope. Nothing for a few days than a whole lot of new mushrooms greeted me in the morning! The second bloom is not as blue as the first but they are still amazing. They are delicious in omelets and in stir fry dishes and served sautéed. You can’t help but talk to them. Maybe I’m on to the secret. Love thy mushrooms.
North Spore
Your review made our day, Sheila! Please reach out if you ever need anything.

Awesome
Super easy, got 3 harvests, tasted great.
North Spore
Thanks for sharing, Sean! We appreciate you taking the time to share your experience.

Pleased with purchase of Blue Oyster
Glad I purchased this product. Followed the directions and had a pretty good first harvest. Second harvest was a little disappointing but wound still purchase again.

First timer
I bought this on a whim . Wow am I glad. I'm like 2 days away from first harvest. It exploded in growth over 24 hours.

Blue Oyster “Cult”
Moving up as I assemble some mono tubs, i thought I’d try the Blue Oyster spray and grow kit while reading for mor advanced grows. After 13 days of spraying I wasn’t seeing any activity, i re-read all the directions again for the 5 or 6 time. I broke out a little humidity tent I had used with my shiitake logs. Put it on and gave it a good mist. The next morning lots of big pins and little mushrooms. 3 days later it’s big and ready for the first harvest. I’m going to use the biggest healthyest one to try my hand at spore prints. And some of the grains on agar to keep a copy of this strain. I liked this so much I signed up for the subscription kit so I can try all the varieties to settle on a few favorites. What are you waiting for, buy one of these and get started. Easy,Tasty,