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Blue Oyster Mushroom Spray & Grow Kit












Skill level | Beginner |
Grow location | Indoors |
Grow speed | 1-2 weeks |
Shelf life | 3 months (refrigerated) |
Flavor profile | Savory, meaty, earthy |
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 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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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) Fill the sprayer included in your kit with tap water and 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! See instructions below).
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.' This will usually begin to happen within two weeks of slicing the plastic.
5) Harvest before the caps flatten out and become concave. Mushrooms 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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The spawn used in our mushroom kits is grown on USDA certified organic grain and made with organic cultures from our own culture bank. Our kits are handmade from a blend of locally sourced, all-natural, organic, and 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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Tasty, beautiful, and fun to grow
So easy to grow and delicious, and they're so beautiful! Our kit produced two flushes and may have made more if we'd taken better care of it. These were great to add to quiche. Definitely recommend.


So much fun to grow and so delicious.
I got the blue oyster spray and grow kit. This was simply an amazing experience. Once my mushrooms pinned, they were ready to eat within a week and wow were they delicious. I also just watched your YouTube video on growing mushrooms outdoors in a veggie garden and I'm inspired to give it a try.

Blue Oyster
GREAT: I bought the Spawn Bags and grew them out in a five gallon bucket and covered tub. Incredible heavy growth. Check out pictures . North Spore was recommended to me by a professional mycologist from the University of Massachusetts. She told me to get in contact with North Spore In preference to anyone else local or on the web! I’ve been very impressed with these guys. They’ve given me tons of help over the phone, and email . The Grainspawn is incredibly healthy, And my mushroom growth has been very heavy and quick. I’m going to be ordering trumpet mushrooms, lions mane , and a few other exotics! You will not be disappointed with North Spore. If something does go wrong with your grow out , they provide great help right away by email. I wouldn’t hesitate to use these guys again and again. As I said, if it’s good enough for a mycologist who’s working commercially, then it’s good enough for the home hobbyist. Hope to be trying to grow some kind of mushroom outside too. And by the way , if anything goes wrong that is their fault, they will make it right! Honest, Helpful, and with a really good product. Don’t hesitate to buy. IMHO

Huge flush!
The blue oyster was the quickest to grow and got huge! Not as blue as shown on the box, more of a soft dove grey color. Excellent flavor and texture. Only a few tough spots at the very bottom of the stems. We battered and fried them in clusters. My husband thought that they were an excellent fried chicken alternative.

Tasty mushrooms
I was a little hesitant to give these kits a try, but decided to purchase two anyways. After 17 days I was able to finally harvest my mushrooms. They are so tender and fresh! I do not think I can go back to store bought mushrooms!