15+ Species · Organic Millet · Verified Genetics
Mushroom Spawn Canada
15+ varieties of premium grain spawn made in Ontario with lab-isolated genetics.
Made fresh to order — allow 14-21 business days before shipping
Singles & Cases
All Grain Spawn
Buy mushroom spawn in Canada: 5 lb bags on certified organic millet, colonized in-house with lab-isolated genetics.
Antler Reishi Mushroom Spawn
$39.00
(1)
Black Oyster Mushroom Spawn
$39.00
(5)
Black Pearl King Oyster Mushroom Spawn
$39.00
(5)
Blue Oyster Mushroom Spawn
$39.00
(6)
Chestnut Mushroom Spawn
$39.00
(6)
King Blue Oyster Mushroom Spawn
$39.00
(8)
King Trumpet Mushroom Spawn
$39.00
Lion's Mane Mushroom Spawn
$39.00
(5)
Pink Oyster Mushroom Spawn
$39.00
(9)
Shiitake 3782 Mushroom Spawn
$39.00
(5)
Shiitake 3790 Mushroom Spawn
$39.00
(5)
Turkey Tail Mushroom Spawn
$39.00
(5)
White Oyster Mushroom Spawn
$39.00
(5)
Made fresh to order. All spawn is produced in our CFIA-licensed facility. Please allow 14-21 business days before your order ships.
Premium Mushroom Spawn Made in Canada
Nature Lion grain spawn is produced in-house at our CFIA-licensed facility in Brantford, Ontario. Every batch starts with lab-isolated genetics grown on certified organic millet grain under strict sterile protocols. We don't resell third-party spawn — we produce everything from culture to finished bag in our own lab.
Our spawn is available in 5 lb bags as singles or cases of 6 at commercial pricing. Each bag is produced fresh to order and ships free anywhere in Canada. We carry 15+ species including Lion's Mane, Blue Oyster, Pink Oyster, Shiitake (two strains), Turkey Tail, Chestnut, Black Oyster, White Oyster, King Trumpet, and Antler Reishi.
Not sure how much spawn you need? Use our spawn ratio guide to calculate the right amount for your substrate volume, or check our substrate guide to learn which substrates work best for each species.
Frequently Asked Questions
What is grain spawn?
Grain spawn is sterilized grain (we use certified organic millet) that has been inoculated with mushroom mycelium. It serves as the seed material you mix into bulk substrate to grow mushrooms at scale.
How much spawn do I need per bag?
A standard spawn-to-substrate ratio is 10-20% by weight. One 5 lb bag of grain spawn is enough to inoculate 25-50 lbs of bulk substrate, depending on the species and your preferred colonization speed.
How long does grain spawn last?
Grain spawn is best used within 2-4 weeks of receiving it. Store it in a cool, dark place (around 4°C / fridge temperature) if you need to delay use. Do not freeze grain spawn.
Do you ship spawn across Canada?
Yes. We ship grain spawn anywhere in Canada with free shipping on all orders. Spawn ships Monday through Wednesday from our CFIA-licensed facility in Brantford, Ontario.
Where can I buy mushroom spawn in Canada?
Nature Lion produces and sells mushroom grain spawn from our CFIA-licensed facility in Brantford, Ontario. We ship free to all Canadian provinces and territories. Order online at naturelion.ca/shop/spawn.
What species of mushroom spawn do you carry?
We carry 15+ species including Lion's Mane, Blue Oyster, Pink Oyster, Black Oyster, White Oyster, King Trumpet, Shiitake (warm and cold weather), Turkey Tail, Chestnut, Antler Reishi, and more. All are produced on certified organic millet grain.