Without
With mycorrhizaeGlass-box root trial
Same grass. Same box. One scoop apart.
Perennial rye in glass-sided root boxes, grown side by side and photographed the day we opened them. The difference below the surface is the whole story.
Great White Premium Mycorrhizae®
Great White Premium Mycorrhizae®
Regular price $13.95 Sale price $11.861 oz pouch15% off
≈ 8 reservoir feeds at 1 tsp / 10 gal — about
$1.62$1.38 per feed
- Free shipping over $60$70Ships next business day · U.S. orders
- Made in USALab tested · family owned since 1999
- Safe for people, planet & petsEvery species on the label
Great White Premium Mycorrhizae®
1 oz pouch · $1.62$1.38 / feed
The 24-species myco powder that built the brand.
Great White is the flagship: nine species of endomycorrhizae, twelve strains of beneficial bacteria, two Trichoderma, and a working yeast — 24 species in every scoop, every count printed on the label. The fungi colonize your roots and run mycelium out past the root tips, trading water and nutrients back to the plant for sugars. Roots get reach they could never build alone, and the plant feeds from far more of the medium.
Dust seeds with it. Dip clones in it. Line the transplant hole, top-feed it, or drop it straight in the res. From first true leaves to full flower, Great White is the base layer of a serious feed program — soil, coco, or hydro.
1 tsp treats a 10-gallon res. Price it per feed, not per ounce.
What's in every scoop — all 24 species
What's in every scoop — all 24 species
Endomycorrhiza: Glomus aggregatum – 83 props per gram · Glomus intraradices – 83 · Glomus mosseae – 83 · Glomus etunicatum – 83 · Glomus clarum – 11 · Glomus monosporum – 11 · Paraglomus brazilianum – 11 · Glomus deserticola – 11 · Gigaspora margarita – 11 props per gram
Beneficial bacteria (each at 525,000 CFU per gram): Azotobacter chroococcum · Bacillus subtilis · Bacillus licheniformis · Bacillus azotoformans · Bacillus megaterium · Bacillus coagulans · Bacillus pumilus · Bacillus amyloliquefaciens · Paenibacillus durum · Paenibacillus polymyxa · Pseudomonas aureofaciens · Pseudomonas fluorescens
Trichoderma & yeast: Trichoderma koningii – 187,875 CFU per gram · Trichoderma harzianum – 125,250 CFU per gram · Saccharomyces cerevisiae – 525,000 CFU per gram
Every species and count, printed on the label.
How to run it — rates for every setup
How to run it — rates for every setup
Repeat every 2–3 weeks — every stage, every setup.
- Seeds: lightly dust with Great White.
- Clones/cuttings: dip in rooting gel, then lightly dip in Great White powder. Pre-soak or fertilizer solution: 1 tsp (3.3 g) per 2 gal (7.5 L) of water.
- Transplant: lightly dust the hole, set the plant right on top.
- Soil, coco & top-feeding: 1 tsp (3.3 g) per 2 gal (7.5 L) of water.
- Hydro: 1 tsp (3.3 g) per 10 gal (38 L), into the res with your regular feed.
Powder settling in the res is the carrier, not the microbes — nothing's lost, it's normal.
Compare sizes
One formula, six sizes.
Same 24 species in every scoop. A feed is one 10-gallon reservoir change at 1 tsp (3.3 g).
1 ozA sachet for a few containers, or your first run.
≈ 8
4 ozA tent or small room, season after season.
≈ 34
8 ozOur pickMultiple rooms, soil or hydro.
≈ 68
32 ozFrequent reservoir changes, multi-room operations.
≈ 274
5 lbBest valueFull commercial rooms.
≈ 687
25 lbBulk rate for commercial and wholesale growers.
≈ 3436
Running a commercial operation? Get pricing by the pail and the pallet →
Since 1999
Killer Roots for Killer Plants®
Family owned since 1999. Every batch is made and lab tested in the USA, and the full species count — all 24 of them — is printed right on the label.
1999
Family owned sinceNo private label, no contract-formula swaps.
24
Species in every scoopMycorrhizae, bacteria, and Trichoderma — all on the label.
8,000+
Amazon reviewsTrusted by growers for consistent roots, every time.
Trial evidence
Real trials. Real results.
Side-by-side grow-outs from our own trials — same starts, same feed, one variable.
WithoutWith mycorrhizae
Without
With mycorrhizaeOregon, field grown
Same field. Same feed. Different roots.
Tomato rows from our Oregon trial plot, planted the same day and fed the same program. The row on the right was inoculated with our mycorrhizae at transplant.
With mycorrhizaeWithout
Side by side
Marigolds don't lie.
Two marigolds, same soil, same water, same weeks. The pot inoculated with our mycorrhizae bloomed harder and held its color.
With mycorrhizaeWithout
Side by side
Basil, twice the size.
Same basil starts, same feed. The plant on the left was inoculated with our mycorrhizae from day one — the control got everything else but the fungi.
With mycorrhizaeWithout
Side by side
Peppers, a head taller.
Same pepper starts, same feed, same stakes. The inoculated plant on the left put on more frame and more flower sites.
With mycorrhizaeWithout
Side by side
Eggplant, built bigger.
Same eggplant starts, same feed. The inoculated plant on the left put on more frame and more leaf — the control never caught up.
WithoutWith mycorrhizae
Side by side
Daisies, doubled up.
Same daisies, same bench, same schedule. The plant on the right was inoculated with our mycorrhizae — more branches, more blooms.
Growers talk
The apex predator of the root zone.
Real reviews from this store's customers — plus 8,000+ more on Amazon.
Run it with
Complete the stack.
They stack — each at its normal rate.
Liquid mycoOrca® Liquid Mycorrhizae
Myco you can pour. Four endo species plus five Bacillus strains, made for aeroponics, misters, and ultra-clean reservoirs.
From Regular price 
Bacteria boosterKing Crab® Liquid Bacteria
Straight bacteria — eleven strains at 25 million CFU per mL. Stack it on any program when you want the bacteria side cranked.
From Regular price Questions
Questions growers ask.
Which size should I get?
Price it per feed, not per ounce. One feed is 1 tsp (3.3 g) for a 10-gallon reservoir. The 1 oz covers about 8 feeds — a good first run. The 8 oz covers about 68 and brings it to about a dollar a feed. The 5 lb is the lowest cost per feed.
How do I use it, and how often?
Hydro: 1 tsp (3.3 g) per 10 gal, into the res with your regular feed. Soil, coco and top-feeding: 1 tsp per 2 gal of water. Lightly dust seeds and transplant holes; dip clones. Repeat every 2–3 weeks.
Does it work in soil, coco and hydro?
All three, seed to harvest. Dust seeds with it, dip clones in it, line the transplant hole, top-feed it, or drop it straight in the res.
There's sediment in my res after using Great White.
Normal. That's the carrier settling out, not the biology. Nothing's lost.
Is it compatible with my nutrients?
Great White goes into the res with your regular feeding. If you've got an edge case, email us.
Which product do I need?
Simplest cut: Great White is the full-spectrum powder you use everywhere, all stages. Orca® is liquid myco for res changes, irrigation, and plants already in the ground. King Crab® is a bacteria-only booster you run with any feed through veg and bloom. They stack — each at its normal rate.
How should I store it?
For maximum shelf life, store between 40°F and 85°F. Never let it sit above 140°F — a hot car or a shed in July will cook the biology.
What does shipping cost?
Free on U.S. orders over $60$70. Under that, shipping is calculated at checkout from your address and order weight. Prefer to buy local? Find a shop near you.
The flagship
Put 24 species to work.
From Regular price $13.95 Sale price $11.86. One teaspoon treats a 10-gallon reservoir — seed to harvest, soil, coco, or hydro.
Every species and count, printed on the label.