‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore
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Availability:
In Stock.
Arrives
Aug 7 – Aug 9
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Features
- INCREASE YOUR YIELD: Our best-selling Boomr Bag is a sterile manure-based bulk mushroom substrate formulated by mycologists to increase the yield of your grow.
- PREMIUM MANURE BLEND: It features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements (although we keep the exact blend a secret!)
- TRUSTED BY GROWERS: Over several years, Boomr Bag has been perfected for dung-loving mushroom species and is widely-trusted by mushroom growers. Note: Substrate is hydrated to field capacity.
- FOR EVERY TYPE OF GROWER: Use Boomr Bag in monotubs, filter bags, and outdoor beds. Or, grow mushrooms from the bag or tray in a humidity-controlled grow room or Martha set up.
- SPAWN TO BULK RATIO: We recommended mixing 1 colonized grain spawn bag with 2-3 Boomr Bags. (Higher inoculation rates may improve your success.)
- STORAGE: Boomr Bags should be stored at room temperature out of direct sunlight. No refrigeration is necessary. They can also be stored for several months before use.
- BEST PRACTICES: We recommend clean hands, latex or nitrile gloves, and sterile technique when using Boomr Bag to reduce the introduction of contaminants. It is also best practice to wait a minimum of 1 week after arrival before using sterile substrates to ensure they were not compromised during transit.
Brand: North Spore
Style: Sterile substrate
Item Weight: 5 Pounds
Item Volume: 4.75 Liters
UPC:
Product Dimensions: 8 x 5 x 5 inches
Item Weight: 5 pounds
Manufacturer: North Spore
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Aug 7 – Aug 9
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Perfect flushes
Reviewed in the United States on May 15, 2025 by Tim
North spore is the best. Im 100% with their products
Reviewed in the United States on April 29, 2025 by Gem
I switched to boomr bags after being unsatisfied with other pre-pasteurized substrates and mixing and sterilizing my own. It's not cheap, but the end result is superior. Keep bag for at least a week before using to check for contam. North Spore will replace for free any contaminated bags if you contact them. I've never seen a contaminated bag even after over 20 orders, but I have had to get north spore to replace a grain bag which they did hassle-free. Just take a pic of the contaminated and the lot number sticker on bag and email them. For anyone saying this substrate doesn't work for manure lovers, I'd say you just don't know how to grow mushrooms. A lot of people contaminate batches themselves without realizing it. The bag may come too wet or dry. Too dry, just spray with distilled water during mixing with spawn in sterilized room. Too wet (you can tell if water separates from substrate and you can see liquid in bag) let it dry out by spraying breather patch with alcohol and unfolding bag a little and let sit a few days. Always spray breather port with alcohol before handling or moving it from box. Airborne bacteria can get pulled into bag from patch.
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Reviewed in the United States on January 21, 2023 by Travis Lee
Had sweet funky smell upon opening & field capacity was on dry side. Had them replace, which they did, again sweet smell, not woodsy. Field capacity lacking again. Just returned it, bag also molded even though stored correctly. Disappointed, not sure if it's production date but 1st tagged 4/12, next 4/23. Maybe they not keep around so long?
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Reviewed in the United States on May 30, 2025 by Becca
Original order was for 2 dung lovers bags, waited a few weeks and saw that one was contaminated. Contacted North Spore directly with my Amazon order # and they immediately sent me a replacement. Great customer service response and communication. Ordered 3 more dung lovers bags due to my needs and currently waiting to see if they along with the replacement crop up with contamination. Great response from North Spore otherwise.
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Reviewed in the United States on June 10, 2025 by Amazon Customer
Very satisfied with the product. It has colonized very quickly and so far, no contamination. Thank you guys.
Reviewed in the United States on March 1, 2025 by David Kalb
This is the 2nd manure based substrate I've tried. 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.
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Reviewed in the United States on May 29, 2025 by Placeholder Placeholder
Fast shipping and very clean and high quality from its box and provided instructions to the actual bag all top notch quality, I will update about the results but so far I am happy with my purchase and definitely purchase more of this products of this seller. Highly recommended
Reviewed in the United States on November 1, 2024 by mehran