Mycorrhizal Fungi for Gardens
Garden mycorrhizal fungi colonize roots and help unlock water and soil nutrients. Apply in beds and raised gardens to support stronger vegetables, flowers, and resilience under stress.
Apply it around the root zone or into growing media as directed to make beneficial biology an easy part of planting, repotting, or routine garden care.
Why You'll Love It
- Root Partnership Colonizes roots in garden beds and raised gardens.
- Nutrient Uptake Helps unlock water and nutrients already present in your soil.
- Steady Growth Supports stronger vegetable and garden growth through the season.
Made by growers
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- We're growers, not resellers. We use this on our own plants before it ships.
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Garden mycorrhizal fungi colonize roots and help unlock water and soil nutrients. Apply in beds and raised gardens to support stronger vegetables, flowers, and resilience under stress.
How to Use Mycorrhizal Fungi for Gardens
| Method | Amount | How Often |
|---|---|---|
| Transplanting | Sprinkle on the roots and in the hole when transplanting | Once, at planting |
| New soil prep | Mix in 4 Tbs per cubic foot of soil | Once, when preparing soil |
| Established plants — garden beds | 4 Tbs per 100 sqft, spread evenly and gently mixed into the top of the soil, then watered | Apply every 2-4 weeks in spring and summer, every 4-8 weeks in fall and winter |
| Established plants — small to medium potted plants | 1/2 to 1 tsp, same application | Same schedule |
| Established plants — large potted plants | 1/2 to 1 Tbs, same application | Same schedule |
| Compost tea | 1/4 - 1/2 tsp per gallon of compost tea | Add when brewing |
This is a dry inoculant, not a fertilizer — the goal is contact between the granules and roots or soil, not dissolving it in water. Direct root contact at transplanting gives the biggest payoff; surface applications work down with watering.
What's Inside
Three groups of living organisms, measured in colony-forming units rather than NPK. The mycorrhizal fungi — led by Rhizophagus intraradices, the species that partners with vegetables, flowers, and most garden plants — colonize roots and grow outward as a network of fine threads, effectively multiplying the root area drawing in water, phosphorus, and micronutrients. Inoculated transplants get a mature root system's reach before they've grown one, which is why the planting hole is where this product earns its keep.
Backing the fungi, a bench of soil bacteria — Bacillus subtilis and five other Bacillus and Paenibacillus species at 580-680 million cfu per pound each, plus two Streptomyces — improves nutrient cycling in the root zone, and two Trichoderma species help beneficial organisms dominate the soil around roots. There's no NPK by design: this rebuilds the soil biology that makes your fertilizer and compost more effective, not a replacement for either.
Made For
Vegetable gardens, raised beds, flower beds, and container plantings — tomatoes, peppers, squash, beans, annuals, perennials, roses, and shrubs — especially at transplanting time, when filling new beds with fresh soil, and in older gardens where the soil has gone tired.
Problems It Solves
- Transplants that sulk for weeks instead of taking off
- New raised beds filled with bagged soil that has no biology in it
- Older garden soil that responds weakly to fertilizer and compost
- Container plants with rootbound, underperforming root systems
FAQs
How do I apply mycorrhizal fungi in a garden?
Match the method to the moment. At transplanting, sprinkle it on the roots and in the hole — the highest-value use. For new soil, mix 4 Tbs per cubic foot. For established beds, spread 4 Tbs per 100 sqft into the topsoil and water; potted plants take 1/2 to 1 tsp (small-medium) or 1/2 to 1 Tbs (large). Repeat every 2-4 weeks in season, every 4-8 weeks in fall and winter.
What do mycorrhizae actually do for garden plants?
They're fungi that colonize roots and grow outward as fine threads, functioning as an extension of the root system — reaching water and nutrients, especially phosphorus, far beyond the roots themselves. The plant feeds the fungi sugars in exchange. Practically, that means transplants establish faster, plants handle heat and dry spells better, and the fertilizer you apply gets used more completely.
Do I still need fertilizer and compost?
Yes — this contains no NPK and no organic matter. Mycorrhizae and bacteria improve how effectively roots find and absorb nutrients, but they don't supply the nutrients themselves. The three layers work together: compost builds soil structure, fertilizer supplies nutrition, and the inoculant builds the biology that connects roots to both. It solves the puzzle of a well-fed garden that still underperforms.
Should I add this to new raised bed soil?
New beds are one of the best uses. Bagged soil and soilless mixes are typically sterile or close to it — good structure, no biology. Mixing in 4 Tbs per cubic foot as you fill the bed inoculates the whole root zone before anything is planted, and sprinkling a little extra on roots at transplanting seals the connection. Beds started this way skip the slow first season many new raised beds have.
Does tilling or fungicide kill mycorrhizae?
Both work against them. Tilling physically breaks up the fungal network each season, and soil-applied fungicides can suppress beneficial fungi along with the targets — two big reasons garden soil ends up biologically depleted. Reapplying after soil disturbance restores the population, which is why the label includes a maintenance schedule and not just a planting dose. Minimizing deep tilling helps the colony persist.
When will I see results?
Soil biology runs on a longer clock than fertilizer. Colonization takes several weeks after root contact, so expect little visible change the first month. Transplants show it first — inoculated seedlings hold through transplant shock and push new growth sooner, typically within 4-8 weeks. In established beds the payoff is cumulative over a season: steadier growth, better drought tolerance, stronger response to feeding.
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