Trichoderma for Plants | Root Zone Inoculant

When to use Trichoderma for Plants

When you're working beneficial microbial granules into the topsoil around your established garden plants
If your potted plants are actively growing and you want to incorporate inoculant into the top of their potting mix as directed
During seasonal soil care in your garden, while growing conditions support active roots and microbial activity
When you're preparing compost tea and want to use Trichoderma at the rate listed on the product label

This product is granular, not liquid. Don't expect it to fix your plant's disease symptoms or guarantee root growth; those outcomes depend on many factors.

Results you can see

Feeds foliage for deeper color and a brighter, more lively look.

Encourages fresh leaf and stem growth for a fuller, thriving plant.

Supports healthy, resilient roots that absorb nutrients more effectively.

Works at the roots in soil or growing media

Vegetable Transplants
Seedlings
Cuttings
Houseplants
Container Plants
Raised Beds
Coco and Soilless Media
New Plantings

How to use

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

What's inside

Two Trichoderma species lead the blend — Trichoderma harzianum at 28.6 million cfu per pound and Trichoderma viride — fast-growing soil fungi that colonize the zone immediately around roots. They're among the most studied organisms in soil biology for a simple reason: they establish quickly, compete hard for space and resources in the root zone, and grow alongside roots as they extend, so the beneficial biology keeps pace with your plant instead of getting left behind.

They don't work alone. The same bacterial bench as the rest of the TPS soil line — Bacillus subtilis and five other Bacillus and Paenibacillus species at 580-680 million cfu per pound each, plus two Streptomyces — handles nutrient cycling, and mycorrhizal fungi (led by Rhizophagus intraradices) colonize the roots themselves, extending their reach for water and phosphorus. There's no NPK by design: this establishes the living layer around roots; your fertilizer feeds the plant that grows through it.

Frequently asked questions

How do I apply Trichoderma to plants?

Trichoderma for Plants is a dry inoculant, so contact with roots or soil is what counts. At transplanting, sprinkle it on the roots and into the hole. For new soil, mix 4 tablespoons per cubic foot. In established beds, work 4 tablespoons per 100 square feet into the topsoil and water in; pots take ½ to 1 teaspoon for small to medium pots or ½ to 1 tablespoon for large ones. Repeat every 2–4 weeks in season, every 4–8 weeks in fall and winter, or brew ¼ to ½ teaspoon per gallon into compost tea.

What is Trichoderma and why would I add it to soil?

Trichoderma are naturally occurring soil fungi found in healthy root zones worldwide, and among the fastest-colonizing beneficial organisms in soil. They establish in the space immediately around roots, compete vigorously for that territory, and keep growing as the roots extend, so the biology keeps pace with your plant. Healthy garden soil usually has them; sterile bagged mix and worn-out beds usually don’t. Trichoderma for Plants restores that population with Trichoderma harzianum and Trichoderma viride, backed by soil bacteria and mycorrhizal fungi.

Is this a fungicide or disease treatment?

No. Trichoderma for Plants is a soil inoculant; it isn’t registered as a pesticide and makes no claim to prevent or treat plant disease. What it does is ecological: it establishes beneficial fungi and bacteria that occupy the root zone and compete for its space and resources. If you have an active disease problem, address it with a product registered for that purpose along with cultural fixes such as drainage and watering habits, and use this to rebuild the biology as the roots recover.

How is this different from the mycorrhizae and soil microbes products?

All three TPS soil products share a base of organisms; the difference is emphasis. The mycorrhizal fungi product leads with the fungi that form a direct partnership with roots, which suits transplant establishment. The soil microbes product leads with the bacteria that drive nutrient cycling across a whole bed. Trichoderma for Plants leads with Trichoderma, the fast fungal colonizers of the zone immediately around roots. For root-zone occupation specifically, start here; for general soil revival or transplanting, the siblings fit better.

Do I still need fertilizer?

Yes. Trichoderma for Plants contains no NPK at all. The Trichoderma and supporting organisms establish living biology around the roots, but they don’t feed your plant; your regular fertilizer does that. The two work together: the biology improves how well roots use what you feed, and a well-fed plant grows more roots for the biology to colonize. Neither replaces the other, so run this alongside your normal feeding schedule rather than in place of it.

When will I see results?

Trichoderma are fast colonizers by fungal standards, established in the root zone within days to a couple of weeks of contact with moist soil, but the visible evidence comes through your plants rather than the soil. Expect transplants treated with Trichoderma for Plants to root in and resume growth sooner, typically noticeable within 3–6 weeks, and steadier performance in beds that have historically started slow. Like all soil biology, the effect builds over a season rather than arriving in a single flush.

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