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Premium Sterile Substrates
'Boomr Bag' Sterile Manure-Based Substrate
Perfected by mycologists for dung-loving mushroom species, our best-selling sterile manure substrate is formulated to maximize your mushroom yield.
Organic Sterilized Grain Bag with Injection Port
Our best-selling sterile mushroom grain bags contain a proprietary blend featuring hydrated, nutrient-rich, certified organic millet and wheat berries.
'Wood Lovr' Sterile Hardwood-Based Substrate
Formulated for hardwood-loving mushroom species, the combination of micro-to-macro particle sizes helps maximize mushroom yield.
All North Spore sterile substrates are handmade in Maine, USA and 100% guaranteed
Faster colonization, bigger flushes!
Our sterile mushroom substrates are formulated by expert mycologists for a better grow! Maximize the speed and size of your flushes with our proprietary blends.
No more cooking horse dung in your oven. No more sourcing wood chips treated with anti-fungal agents. No more contaminated grain bags.
Read what customers are saying
"My first time using the Boomr bag and it was great! My grain spawn took immediately and produced a beautiful fruiting! Will order again."
Jacob A.
"Best spawn bags in the industry! Every bag is delivered with the highest quality and are double sealed for added protection."
Scott G.
"North Spore is your clean mycology source. These guys are top drawer. I have yet to have any problem with or substrate."
Richard C.
New to mushrooms? Watch our step-by step monotub video!
Quality and service guaranteed
North Spore is your trusted source for the highest quality mushroom substrates, spawn, and growing supplies on the market.
With multiple trained mycologists on staff and a team of mushroom experts in our customer service department, we can provide you with unparalleled customer service.
