See It In Action
What's inside Big Foot Mycorrhizae?
Watch how our unique blend of myco, azomite, and kelp works together to build a living soil ecosystem.
What is in mycorrhizae? Big Foot Microbes explained
Made in Grants Pass, Oregon
Healthier roots.
Better plants.
Mycorrhizal fungi and beneficial bacteria that build stronger roots from the ground up.
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Top Picks This Season
Our best-selling formulas, trusted by growers across the country.
What is Mycorrhizae?
The living network your soil is missing.
Mycorrhizal fungi form a symbiotic bond with plant roots, extending their reach up to 700× and unlocking nutrients that plants can't access on their own. It's how plants thrived for 450 million years before synthetic fertilizers existed, and it still works better than anything we've invented since.
Big Foot adds mycorrhizae, beneficial bacteria, kelp, biochar, and azomite into one formula. Apply once at the root zone. That's it.
Learn how mycorrhizae works →
Featured Product
Our Signature Formula
Pick your size and see pricing. Full application details on the product page.
Simple Application
Three steps to healthier roots
1
Apply at Root Zone
Mix or apply directly to root zone or growing media, as directed for your product.
2
Fungi Colonize Roots
Spores bond with root tips, expanding surface area up to 700×.
3
Plants Thrive
More water, more nutrients, faster establishment all season.
Our Products
Mycorrhizae for every plant & grower
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The Science Behind Big Foot
Formulated by a USDA Scientist
"Mycorrhizal fungi are not a luxury. They are essential. Plants evolved with them over 450 million years. When we restore that relationship, we restore the plant's full potential."
Dr. Mike Amaranthus
USDA Forest Service Soil Ecologist
40+ Years of Mycorrhizal Research
40+ Years of Mycorrhizal Research
Why Big Foot Wins
Why growers choose us over synthetic fertilizers
| Feature | Big Foot | Synthetic |
|---|---|---|
| Builds living soil biology | ✓ | ✗ |
| Lasts for the life of the plant | ✓ | ✗ |
| Safe for pets & kids | ✓ | ✗ |
| OMRI Listed options available | ✓ | ✗ |
| Reduces transplant shock | ✓ | ✗ |
| A formula for every plant type | ✓ | ✗ |
| Made in the USA | ✓ | ✗ |
| Expands root surface area up to 700× | ✓ | ✗ |
| Can burn roots if over-applied | ✗ | ✓ |
Rooted in Oregon
"Seeing the effect our senior project had on the local environment changed me. We were able to reestablish something majestic back to its former self, organically."
Dan Mecum, Co-Founder · Grants Pass, Oregon
Read our story →Customer Reviews
Growers love Big Foot
Home gardeners, greenhouse growers, and landscapers across the country trust Big Foot for healthier plants.
From the Blog
Learn how mycorrhizae works
Grower guides, plant research, and tips from our team.
For Businesses & Growers
Looking for white label?
We offer custom white label blends through our sister site Mycorrhizal Online.