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Premium Sterile Substrates
Faster colonization, bigger flushes!
Our sterile mushroom substrates are formulated by expert mycologists for a better grow! No more cooking horse dung in your oven. No more sourcing wood chips treated with anti-fungal agents. No more contaminated grain bags.
'Boomr Bag' Sterile Manure-Based Substrate
We formulated our best-selling sterile bulk substrate to maximize your mushroom yield. Featuring a proprietary blend of composted horse manure, coco coir, and a variety of quality substrate supplements, it has been perfected by our mycologists for dung-loving mushroom species.
Organic Sterilized Grain Bag with Injection Port
Our sterile mushroom grain bags are formulated to maximize the speed and size of your mushroom grow. Each bag contains a proprietary blend featuring hydrated, nutrient-rich, certified organic millet and wheat. Bags include a self-healing injection port with micron filter patch.
'Wood Lovr' Sterile Wood-Based Substrate
We formulated this mushroom growing substrate for hardwood-loving species. The combination of micro-to-macro particle sizes of premium North American hardwood chips and sawdust plus nitrogen supplementation helps to speed up growth and maximize mushroom yield.
All North Spore substrate is handmade in Maine, USA and 100% guaranteed
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 while shipping. "
Scott G.
"North Spore is your clean mycology source. These guys are top drawer. I have yet to have any problem with grain bags or substrate."
Richard C.
New to mushrooms? Watch our step-bypstep 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.
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*North Spore’s products shall be used only for lawful purposes
