North Spore Boomr Bag Sterile Mushroom Substrate, 5 lb, 8-Pack
Condition: One-time purchase
$184.99
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Non-returnable due to Food safety reasons
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Availability:
18 left in stock
Arrives
Nov 15 – Nov 19
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At a glance
- Condition
- One-time purchase
- Size
- 8 Pack
- Model
- 8pack
- Weight
- 40 lb
Features 5
- HIGHER YIELDS FROM A SUBSTRATE BUILT FOR THE JOB: Boomr Bag is a sterile mushroom growing substrate formulated by mycologists specifically for dung-loving species; each batch is sterilized in a commercial-grade autoclave and lab-tested with biological indicators for contam-free performance
- A PROPRIETARY MANURE-BASED MUSHROOM SUBSTRATE BLEND THAT WORKS: made from composted horse manure, coco coir, and select substrate supplements, hydrated to field capacity, with balanced pH, rich nutrients, and aeration properties that support vigorous mycelial growth and consistent fruiting
- TRUSTED BY 350K+ MUSHROOM GROWERS AND COUNTING: North Spore's Boomr Bag has been refined over several years, made entirely from organic, non-GMO materials free of harmful additives, so beginners and experienced cultivators alike get a clean, reliable start every grow
- VERSATILE ENOUGH FOR ANY SETUP: use Boomr Bag in monotubs, filter patch grow bags, trays, and outdoor beds, or grow directly from the bag in a humidity-controlled grow room or Martha setup; mix 1 colonized grain spawn bag with 2-3 Boomr Bags for best results
- NO REFRIGERATION, NO STRESS: store at room temperature out of direct sunlight for several months; for best results, wait at least 1 week after arrival before use, and always apply sterile technique when inoculating to protect your investment
Description
Our best-selling Boomr Bag is a sterile manure-based bulk mushroom substrate formulated by mycologists to maximize your mushroom yield. Boomr bag was developed for growing edible and medicinal dung-loving mushroom species. (If growing hardwood-loving species, use our Wood Lovr sterile substrate instead.) Boomr Bag features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements. Bags are hydrated to field capacity. Boomr Bag was formulated by expert mycologists in Maine, USA to increase the yield of your grow. The formula has been perfected over the years for dung-loving mushroom species. Boomr Bags are made in a vertically-integrated facility and sterilized in a commercial-grade autoclave. Sterility is verified using biological indicators and temperature sensors. North Spore was launched in 2014 by a mycologist, an organic farmer, and a photojournalist -- three college friends brought together through their shared love of the mycological world. North Spore provides everything one needs to grow mushrooms, from the beginner to the expert. From Spray & Grow Kits to growing chambers, sterile substrates, lab supplies, and more. We also offer medicinals made with the highest quality fruiting body extracts.
Specs 2
| Item Weight | 40 pounds |
|---|---|
| Manufacturer | North Spore |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 15 – Nov 19
This item is non-returnable:
Non-returnable due to Food safety reasons
View our full returns policy here.
Non-returnable due to Food safety reasons
View our full returns policy here.
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Top Amazon Reviews
The product is the best
Size: 1 Pack
Price seems to be in little inflated to make up for delivery. But excellent product.
Reviewed in the United States on August 26, 2026 by Bayard MacDonald
Very Good
Size: 8 Pack
The best substrate I have ever used, good yield and large fruits.
Reviewed in the United States on August 21, 2026 by RODNEY J.
North Spore Rocks!
Size: 1 Pack
Great products and excellent customer service. Boomr Bag is like a shroom cheat code!
Reviewed in the United States on September 4, 2026 by timothy o
Contamination, Green Mold
Size: 1 Pack
Extremely frustrated and disappointed in the complete failure of this product. First time I’ve tried this product rather than pasteurizing my own and likely the last time. I figured I’d give these guys a shot and see if I could save myself some time and capital invested but instead I just ended up wasting my money/time, grainspawn and agar cultures. I was running a side by side comparison with control, 6 cakes with this product; “Boomer Bag” (I should say more adequately named “Bummer bag”) and 6 cakes with my “house” blend. 3 “strains” spawned in grain from same sterilized batch, all work and completed in clean room style Hepa positive pressure environment with merv 16 filtration, with cleaning and sterilization per SOP conducted between each individual cake to prevent cross contamination of individual casings. Any variables were negligible, substrate media and strain genetics being the only known differences. Over the following 10-15 days all six cakes using Boomer Bag substrate developed green mold. Testing was concluded, cakes were removed and destroyed. I know contamination is always a factor and to some extent is expected. So complete failure after extensive time and investment is unacceptable. Especially is a situation where an expensive product is used that is supposed to provide superior results and at the very least be free from contamination.
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Reviewed in the United States on July 8, 2022 by TruPyroDice
Grew good mushrooms
Size: 1 Pack
When it was delivered, it looked like it was ran over by something and the box was torn up but the bag was fine no contams. I used them as substrate for 2 uncle bens bags colonized with some magic mycelium and at a 1:1 ratio in a 6qt shoe box and they produced a lot of mushrooms after 2 weeks currently going into the 2nd flush. This substrate has given me better results than coco coir based substrates.
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Reviewed in the United States on June 26, 2021 by Daryl E
North Spore Rules!!
Size: 1 Pack
Everything from north spore is top notch. This is no exception.
Reviewed in the United States on August 14, 2026 by Noah Reynolds
Great product
Size: 1 Pack
Works great. 1st time doing this and it’s been a breeze
Reviewed in the United States on July 29, 2026 by Clifton castle
First impressions(and 2nd, and 3rd)
Size: 1 Pack
This is the 2nd manure based substrate I've tried, the 1st I've had good results from. When I opened the box, comparatively, it looked like mulch. I actually thought they sent wood lovers by mistake lol I'm no expert, but again compared to my trusted brand, this one looks like it's at least 50% coco cior and the other brand looked like it was only 5%. It probably helps with aeration, and it didn't take as long to break up. Oh, and there was a rock over an inch long.... Will overlook that(minus a star tho) and update with how it performs.. I hope their equipment is OK after that went through lol An update.. 2 things. 1. It was extremely hydrated to the point that I had to carefully take the lid off early with something nearby to pour the water in before giant droplets started raining down.. Minus another star. 2. The cleanup was.. Less gross with less poo lol Will give 1 more try with a different one I'm more familiar with just bc of the easy clean up to see if there's a noticeable difference in quality. I do not recommend for things vulnerable to wet spots. Update: They must read these, the next batch was significantly darker lol. I mean, yay for this time(I hope, still too early), but it also tells me the product isn't consistent. Unless I see 3 nice tasty flushes this time, I'll stick to the other comparatively priced one. Final update: Did not see 3 flushes out of something I've seen have more. Still not a high enough poo to coco coir ratio methinks. I'm not an expert, but I'm not sure why their kits have coco coir to put on top of this, it seems to have enough lol
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Reviewed in the United States on May 29, 2025 by Placeholder