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Maitake Colonized Grain Spawn Bag 5 LB
$2899Unit price /Unavailable -
King Oyster Colonized Grain Spawn Bag 5 LB
$2499Unit price /Unavailable -
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Pearl White Oyster Grain Spawn Bag 5 LB
$2499Unit price /Unavailable -
Chestnut Colonized Grain Spawn Bag 5 LB
$2899Unit price /Unavailable -
Pioppino Colonized Grain Spawn Bag 5 LB
$2499Unit price /Unavailable -
Golden Oyster Colonized Grain Spawn Bag 5 LB
$2499Unit price /Unavailable -
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Pink Oyster Colonized Grain Spawn Bag 5 LB
$2499Unit price /Unavailable 
Colonized Grain Spawn Bag For Commercial Production 3 LBS (Choose Your Variety)
From $2000Unit price /Unavailable
How to Choose Your Grain Spawn
Just starting out?
Pearl White, Blue, and Pink Oyster are the fastest, most forgiving colonizers — the easiest way to get a reliable first harvest.
Chasing flavor and market value?
Lion's Mane, King Oyster, Shiitake, and Chestnut are gourmet and restaurant favorites with distinct textures and longer shelf life.
Ready for a challenge?
Maitake (Hen of the Woods) is a slower, more advanced variety that rewards experienced growers with a prized, high-value harvest.
How Much Do You Need?
Every bag holds 5 LB of fully colonized grain spawn — roughly double a standard 2.5 LB spawn bag. At our recommended ratio, one bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags, so a single spawn bag carries a full block run. Scaling up? Order multiples of the same variety, or mix varieties to diversify your harvest.
Colonized vs. Uninoculated — Which Is Right for You?
Colonized grain spawn (this collection) is ready the day it arrives — break it up and mix straight into bulk substrate. Uninoculated spawn bags and jars let you inject your own liquid culture or spore syringe and colonize from scratch, which costs less per bag but takes two to three weeks. If you want to skip the wait and the contamination risk, colonized spawn is the shortcut.
Frequently Asked Questions
What does "colonized" grain spawn mean?
It means the grain is already fully run through with healthy mycelium and ready to use — no inoculation, sterilization, or colonization wait on your end.
How many Master's Mix blocks does one bag inoculate?
One 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags.
How fresh is the spawn?
Every bag is made fresh daily in our Illinois lab — never stockpiled — with a 90–120 day shelf life. Refrigerate if you're not using it right away.
Can I use these in a monotub instead of Master's Mix blocks?
Yes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.
What grain blend do you use?
A 5-grain blend of rye, white milo, red milo, white millet, and red millet for even colonization and strong nutrient density.