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Mushroom Grain Spawn
Learn more about the types of Grain Spawn that we offer, suggested resources for different techniques and proper use, and our Terms of Use and Agreement information.

Growing Plug Spawn for Logs and Stumps

Mycelium Comes to Life With Paul Stamets!

2019 Milestones

Groundbreaking Research Gives Hope to Bees
Collaborative research between Host Defense's team and Washington State University has been published in Nature’s Scientific Reports. Mycelium extracts of polypore mushrooms (Reishi and Amadou) have been shown to confer an immune benefit to bees. This research provides an actionable solution against the...

An Amazing Letter From a Cultivator in Syria...
Not to sound too impressed with ourselves, but we get wonderful letters from happy customers and devoted fans all the time. And we love to read them! This one, though...this one brought tears to our eyes: "Hello, Paul. Fungi helped...

Fungal Luminescence
The saprobe Panellus Stipticus displaying bioluminescence. Image courtesy of Wikipedia. Here in the Northwest mushroom season is finally in full-swing. October rains beckon mushroamers off trails and into the woods, in search of the elusive Matsutake and delicious Chanterelle. With days growing shorter,...

Carbon Dioxide Enrichment Through Decomposition
Horticulturists have long understood the benefits of carbon dioxide (CO2) enrichment in greenhouses and indoor gardens, and CO2 can often be a limiting factor for plant growth. As CO2 concentration rises above ambient levels, net photosynthesis increases. This improves plant fitness and...