Without
With mycorrhizaeGlass-box root trial
Same grass. Same soil. Microbes added.
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.
Orca® Liquid Mycorrhizae
Orca® Liquid Mycorrhizae
Regular price $39.95 Sale price $33.9616 oz bottle15% off
≈ 94 reservoir feeds at 5 mL / 10 gal — about
42¢36¢ 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
Orca® Liquid Mycorrhizae
16 oz bottle · 42¢36¢ / feed
Myco you can pour.
Orca® takes the Great White idea — myco plus beneficial bacteria — and puts it in a bottle. Four species of endomycorrhizae and five Bacillus strains in a liquid built to run through reservoirs, drip lines, irrigation, and plain old watering cans.
That makes Orca the move for plants that are already in the ground or already in the system: water it straight in, or run it at every res change from start to finish. Five mL treats a 10-gallon res — do the math on a bottle.
What's in every bottle — 4 species, 5 strains
What's in every bottle — 4 species, 5 strains
Endomycorrhiza (each at 19 props per mL): Glomus intraradices · Glomus mosseae · Glomus etunicatum · Glomus aggregatum
Beneficial bacteria (each at 250,000 CFU per mL): Bacillus subtilis · Bacillus licheniformis · Bacillus megaterium · Bacillus pumilus · Bacillus amyloliquefaciens
Every species and strain, printed on the label.
How to run it — rates for every setup
How to run it — rates for every setup
- Seeds: 1–2 drops directly on the seed.
- Clones/cuttings: soak starter cubes at 1–3 mL per 1 gal (4 L) of water, up to an hour. Works in the pre-soak solution too.
- Hydro: 5 mL per 10 gal (35 L) at every reservoir change, start to finish.
- Soil, coco & top-feeding: 1–5 mL per 1 gal, watered into existing plants.
Res dosing at a glance: 10 gal → 5 mL · 20 gal → 10 mL · 40 gal → 20 mL · 50 gal → 25 mL
Compare sizes
One formula, three sizes.
The same guaranteed analysis in every mL. A feed is one 10-gallon reservoir change at 5 mL.
16 ozHand-watering and smaller runs — mix it as you go.
≈ 94
32 ozOur pickMultiple reservoirs, or a full season of top-feeding.
≈ 189
1 galBest valueHigh-volume reservoir programs, dosed every change.
≈ 757
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 ingredient panel — 4 species of mycorrhizae and 5 Bacillus strains — is printed right on the label.
1999
Family owned sinceNo private label, no contract-formula swaps.
9
Species & strains in every bottle4 species of mycorrhizae, 5 Bacillus strains — all on the label.
5 mL
Treats a 10-gallon reservoirAt every reservoir change, start to finish.
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 pourable proof.
Real reviews from this store's customers.
Run it with
Complete the stack.
They stack — each at its normal rate.
The flagshipGreat White Premium Mycorrhizae®
24 species in one powder — fungi for reach, bacteria for uptake. The pick for 9 out of 10 growers.
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. One feed is 5 mL for a 10-gallon reservoir: the 16 oz covers about 94 feeds, the 32 oz about 189, the gallon about 757.
How do I use it, and how often?
Hydro: 5 mL per 10 gal at every reservoir change, start to finish. Soil, coco and top-feeding: 1–5 mL per gallon, watered into existing plants. Seeds: 1–2 drops right on the seed. Clones: soak starter cubes at 1–3 mL per gallon, up to an hour.
Will it run through my system?
That's what it's built for: reservoirs, drip lines, irrigation, and plain old watering cans.
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 pourable pick
Put mycorrhizae in every watering.
From Regular price $39.95 Sale price $33.96. Five mL treats a 10-gallon reservoir — seed to harvest, soil, coco, or hydro.
Every species and strain, printed on the label.