Probiotics for Plants

CharGrow BioGranules™ is a biochar-based probiotic containing beneficial microorganisms and microbial foods. When added to growing media and native soils, BioGranules has been proven to enhance biological activity and plant performance.
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“Really great yield, really great fruit set. Definitely the best tomato crop I’ve ever grown. I will definitely use BioGranules for the tomato crop, and probably for as many other crops as I can.”
Even ChenderThe Culinary Gardener

Growing results using CharGrow BioGranules

Field trials have shown better plant productivity when using BioGranules ™

Our  BioGranules™ product is a proprietary formula that evolved out of our work with organic potting soils, and the need to provide high concentrations of beneficial organisms in “peat lite” growing media.

Field trials with BioGranules™ have shown better plant productivity when added at 2-3% by volume (in growing mixes) or 15 – 20 lbs. per acre in row crops.

Healthy transplants reduce production costs

Healthy transplants reduce production costs

BioGranule inoculated transplants were greener and approximately 25% taller at field setting than control plants. Shortening the time required to produce healthy transplants reduces production costs.

Earlier fruiting, increased profits

Earlier fruiting, increased profits

Earlier fruiting yield was increased by 51% in BioGranule inoculated plants, compared to non-inoculated plants. Earlier fruiting normally results in increased profits, especially for growers in northern short-season climates.

Nutrient retention, environmental benefits

Nutrient retention, environmental benefits

Trial results demonstrated longer-term flower color retention (in Vincas) and reduced nutrient runoff, measured by soluble salts and nitrate-N analyses.

root mass on kale transplant grown with CharGrow BioGranules



“We found that using the BioGranules in our greenhouse mix consistently produced better, sturdier transplants.”
Ellen PolishuckPotomac Vegetable Farms
chargrow biogranules trail results summary eggplant

Eggplant starts – with BioGranules (top) and without (bottom)

Photo Courtesy of Ellen Polishuck – Potomac Vegetable Farms 2016

Virginia Tech

Tomato Transplants

Over 3 years of tomato trials, BioGranules was used at 2.5 Cups per 5 Gallons of potting soil (approx. 3% by volume).


  • 25% taller at field setting
  • 51% increase in yield at 1st pick
  • 10% increase in yield across growing season
Virginia Tech tomato transplant trials with and without CharGrow BioGranules

L: Control  | R:BioGranules-inoculated (2.5%)

University of Florida

Vinca & Hibiscus

In trials with hibiscus and vinca, BioGranules was incorporated at 20 LBS per Cubic Yard.


  • Increased nitrate retention
  • Reduced nutrient runoff
  • Longer-term flower color retention
  • Significantly improved plant growth

12 week-old Vinca Pacifica (L: with BioGranules, R: two plants without)

What’s your next growing project?

Mix BioGranules ™ into your growing media or native soil for seeding, transplants or stepping up
Rates by VOLUME

Add at 2.5% by volume (3 cups per cu. ft.) in growing mixes. Find your project needs by volume below

Rates by AREA

Apply 20 lbs. per acre for row crops and 10 lbs. per 1,000 square feet when inoculating gardens and flower beds, or maintaining turfgrass. Find your project needs by area below

Volume Application Rates

Quick Reference: How much can I accomplish with BioGranules? :: CLICK HERE

Amount of BioGranulesVolume of Media Treated
1 LB1 cu. ft.
10 LB10 cu. ft. / 0.37 cu. yd.
10 LB90 x 72 Cell Trays (6,480 seeds)
10 LB35 x 18 Cell Trays (630 seeds)
10 LB510 x 4 Inch Pots
10 LB66 x 7-8 Inch Pots
50 LB50 cu. ft. / 1.85 cu. yd.
50 LB450 x 72 Cell Trays (32,400 seeds)
50 LB175 x 18 Cell Trays (3,150 seeds)
50 LB2,550 x 4 Inch Pots
50 LB330 x 7-8 Inch Pots

Potting Soil:  Mix 2 – 3 cups BioGranules per cu. ft. of growing media.

Pot size Soil VolumeRepotting, mix BioGranules thoroughly into new potting soilCharging current potted plants, work BioGranules into top 2 inches of soil
4 inch1 pint (0.5 quart)2 Teaspoons1/2 Teaspoon
5-6 inch1 quart (0.25 gal)2 1/2 Tablespoons2 Teaspoons
7-8 inch1 gal : .15 cu ft4 1/2 Tablespoons3 1/2 Teaspoons
12 inch5 gal : .77 cu ft2 Cup1/2 Cup
14 inch7 gal : 1 cu ft3 Cups3/4 Cup
Pots Sizes: Plastic Nursery Pots And Clay Pots :: CLICK HERE

Pot SizeVolume GallonVolume Cubic Feet
4 inch pot (10 cm)1 pint (0.5L)0.019 cu. ft.
5-6 inch pot (13-15 cm)1 quart (1L)0.03 cu. ft.
7-8 inch pot (18-20 cm)1 gallon (4L)0.15 cu. ft.
8.5 inch pot (22 cm)2 gallon (7.5L)0.3 cu. ft.
10 inch pot (25 cm)3 gallon (11L)0.46 cu. ft.
12 inch pot (30 cm)5 gallon (19L)0.77 cu. ft.
14 inch pot (36 cm)7 gallon (26L)1 cu. ft.
16 inch pot (41 cm) 10 gallon (38L)1.5 cu. ft.
18 inch pot (46 cm)15 gallon (57L)2.3 cu. ft.
24 inch pot (61 cm)25 gallon (95L)3.8 cu. ft.
30 inch pot (76 cm)30 gallon (114L)4.6 cu. ft.

Trees and Shrubs: Mix 3 cups BioGranules per cu. ft. of soil from the planting hole. Place mixture into hole at 6-inch depth. Place tree or shrub into planting hole and fill with remainder of mix.

Flower Beds: Incorporate 3 cups BioGranules per cu. ft. of soil from the planting hole.

Area Application Rates

Vegetable Gardens: Apply 2 tablespoons of BioGranules per square foot (1 lb. per 100 square feet) of planting area or apply a pinch of BioGranules with each seed. Work into top 4 – 6 inches of soil; add seed or transplant, and water in.

Vegetable and Flower Transplants: Add 1⁄4 inch layer BioGranules to bottom of transplant hole.

Transplanting: At the time of transplant, use low salt amendments such as fish emulsion as starter fertilizer. Best results have been achieved where a cover crop is worked in prior to setting transplants.

Turfgrass: Apply 1 lb. of BioGranules per 100 square feet when seeding. Work into 4 inches of existing soil.  Add seed, rake and water thoroughly.

Maintenance: Following aeration, dethatching or scarification, apply 1/2 lb. per 100 square feet and mix into the top 4 inches of soil. Water in.

Growing AreaSeeding RateMaintenance Rates
Per 100 SQ FT1 LB1/2 LB
Per 1000 SQ FT10 LB5 LB

Contact Info


CharGrow USA LLC
8 Magnolia Ave, #102
Asheville, NC 28801

6424 Boylston Hwy, Lot 5
Mills River, NC 28759

How can we help?

Contact us for farm, retailer or distributor pricing.  As always, reach out with any questions about the product, application rates or whatever’s on your mind.

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