Made in Grants Pass, Oregon

Healthier roots.
Better plants.

Big Foot adds beneficial mycorrhizal fungi and microbes back into your soil — the same naturally occurring organisms that plants evolved with for millions of years. The result: stronger roots, less transplant shock, and more vigorous growth.

Shop All Products How It Works

Shelf stable up to 3 years

Works for all plant types

OMRI listed organic

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Big Foot Gold

Most advanced formula — bacteria + myco

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Root Boost

Azospirillum for faster root establishment

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Ecto-Mycorrhizae

Designed for conifers, hardwoods & shrubs

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Concentrate

Water-in mycorrhizae — easy application

Our Products

Mycorrhizae for every plant & grower

Every Big Foot formula is packed with endo-mycorrhizae spores that bond with root systems — no fillers, no fluff.

Best Seller

Big Foot Gold

Loaded with both beneficial bacteria and mycorrhizal fungi. The most advanced all-in-one formula on the market — works at transplant or any growth stage.

Gardens Vegetables Transplant

Endo

Big Foot Granular

Cost-effective granular mycorrhizae that reduces transplant shock and establishes healthy roots. Mix into potting soil or apply directly to root zone.

Greenhouse Pots Seed Start

Soluble

Big Foot Concentrate

Highly soluble mycorrhizae — just water it in. Perfect for established plants, large gardens, and growers who prefer a liquid application.

Water-In All Plants Easy Use

New

Big Foot Root Boost

Azospirillum bacteria help clones, cuttings, and seedlings root faster. Plants need nitrogen, and Root Boost delivers it naturally — no synthetic fertilizer needed.

Clones Cuttings Seedlings

Ecto

Big Foot Ecto-Mycorrhizae

Specially formulated for conifers, oaks, hardwoods, and shrubs. Ecto-mycorrhizae wraps around the root tips — essential for trees and woody plants.

Trees Shrubs Conifers

Bundle

Kelp, Biochar & Humate Blend

Nature's finest soil amendments in one formula — kelp extract, biochar, worm castings, and humate micronutrients. Feed the soil, feed the plant.

Soil Food Biochar All Purpose

Simple Application

Three steps to healthier roots

Mycorrhizae works with your existing routine — no special equipment, no complicated process.

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Apply at Root Zone

Sprinkle granular directly into the planting hole or mix into potting media. For concentrate, dissolve in water and apply to root zone at transplant.

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Fungi Colonize Roots

Mycorrhizal spores germinate and form a symbiotic bond with your plant's root tips — extending the root system up to 700x its original surface area.

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Plants Thrive

Your plant accesses more water, more nutrients, and recovers faster from transplant stress. Expect faster establishment and more robust growth all season.

Why Big Foot

The original mycorrhizae formula

We've been doing this since the first scientific studies on mycorrhizal fungi. No shortcuts, no fillers.

No Fillers

Our endo-mycorrhizae formula contains no carriers or filler material. Every gram is active spores and beneficial microbes.

3-Year Shelf Life

All Big Foot products stay effective for up to 3 years when stored properly — stock up without waste.

Science-Backed

Our formulas are rooted in decades of peer-reviewed mycorrhizal research. We were there at the very first studies.

Made in Oregon

Manufactured at our HQ in Grants Pass, Oregon — where the most groundbreaking myco research is happening.

OMRI Listed

Certified for organic use. Grow clean, grow confident — our products meet strict organic input standards.

Works for All Plants

Vegetables, flowers, trees, shrubs, cannabis, houseplants — we have a formula specifically matched to your plant type.

Made in Oregon

Backed by science.
Grown with passion.

Big Foot Microbes has roots in the very first mycorrhizal studies. Our headquarters in Grants Pass, Oregon sits at the heart of the Pacific Northwest — where some of the most ground-breaking research on soil fungi has been conducted.

We don't add fillers. We don't cut corners. Our endo-mycorrhizae spores bond with more root systems than competitor products, and we've enhanced every formula with premium soil amendments: kelp, biochar, micronutrients, and other natural plant boosters.

700x

Root surface area increase

3 yr

Shelf stable life

95%

Plants respond to myco

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Headquarters

Grants Pass, Oregon

Customer Reviews

Growers love Big Foot

Home gardeners, greenhouse growers, and landscapers across the country trust Big Foot for healthier plants.

★★★★★

"I've tried four different mycorrhizae products over the years. Big Foot Gold is the only one where I can actually see the difference — my tomatoes established in half the time and produced like crazy."

Mike R.

Home vegetable gardener, Ohio

★★★★★

"We use the Concentrate formula for all our greenhouse starts. Transplant shock is basically eliminated. Our plant survival rate went from ~85% to over 97% after switching to Big Foot."

Sarah T.

Greenhouse grower, Washington

★★★★★

"The Ecto formula is the real deal for trees. I planted 40 Douglas firs last fall — used Big Foot Ecto on half. The difference in spring growth was dramatic. Ordering again this season."

Dave L.

Reforestation project, Oregon

Healthier roots.
Better plants.

Mycorrhizae for every plant & grower

Three steps to healthier roots

Apply at Root Zone

Fungi Colonize Roots

Plants Thrive

The original mycorrhizae formula

No Fillers

3-Year Shelf Life

Science-Backed

Made in Oregon

OMRI Listed

Works for All Plants

Backed by science.
Grown with passion.

What's inside Big Foot Mycorrhizae?

Growers love Big Foot

Need custom packaging or bulk pricing?

Your Cart

Healthier roots.Better plants.

Mycorrhizae for every plant & grower

Three steps to healthier roots

Apply at Root Zone

Fungi Colonize Roots

Plants Thrive

The original mycorrhizae formula

No Fillers

3-Year Shelf Life

Science-Backed

Made in Oregon

OMRI Listed

Works for All Plants

Backed by science.Grown with passion.

What's inside Big Foot Mycorrhizae?

Growers love Big Foot

Need custom packaging or bulk pricing?

Your Cart

Complete Your Order

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Healthier roots.
Better plants.

Backed by science.
Grown with passion.