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GH BioThrive feeding schedule and calculator

General Hydroponics' BioThrive label rates, scaled to the water you're mixing. GH doesn't publish a week-by-week BioThrive chart, so this follows the product directions by stage.

Checked Oct 20, 2026 Source: General Hydroponics BioThrive Grow and Bloom product directions (generalhydroponics.com)
How to read a feeding chart Schematic of a 12 week feed chart. Each week shows the label dose as a dashed outline, a solid start at 50 percent, and a gold work-up band to 75 percent. Veg weeks 1 to 4, flower 5 to 11, flush week 12. FIG. 01 · READING A FEED CHART SCHEMATIC, NOT A BRAND CHART Label dose, and where to start LABEL 100% WORK UP 75% START 50% 01 02 03 04 05 06 07 08 09 10 11 H₂O 12 VEG · WK 1 TO 4 FLOWER · WK 5 TO 11 FLUSH
01

Mix calculator

Pick a week and how much you're mixing

Many growers here feed below the chart. Start low and raise it only if the plants want more.
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Turn on JavaScript to use the calculator, or read the full schedule below.
02

The full schedule

mL per gallon of water, at full strength

Standard (most soils and mixes)

Stage BioThrive Grow BioThrive Bloom
Veg 5–10
Transition (optional, 1 to 2 weeks) GH suggests half-strength Grow plus half-strength Bloom for sensitive crops. 2.5–5 2.5–5
Flower 5–10

pH 6.0 to 7.0. THCFarmer's soil range.

Aggressive (heavy feeders)

GH: up to 15 mL per gallon, watching overall EC and plant response.

Stage BioThrive Grow BioThrive Bloom
Veg 10–15
Transition (optional, 1 to 2 weeks) GH suggests half-strength Grow plus half-strength Bloom for sensitive crops. 5–7.5 5–7.5
Flower 10–15

pH 6.0 to 7.0. THCFarmer's soil range.

03

Notes from the chart

  • Amounts are mL per US gallon of water, from GH's BioThrive label directions. Feed on your normal watering schedule.
  • Add BioThrive to fresh water first, then any other supplements, stir, and check pH.
  • The aggressive range is shown as 10 to 15 mL ("up to 15" on the label). The transition stage uses half of each, as GH suggests for sensitive crops.

Source: General Hydroponics BioThrive Grow and Bloom product directions (generalhydroponics.com)

05

Threads worth reading

Discussions this page draws on

06

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07

Common questions

Is there a BioThrive weekly chart?

GH doesn't publish one. These are the label rates from GH's BioThrive product pages: 5 to 10 mL per gallon for most soils, up to 15 for heavy feeders.

When do I switch from Grow to Bloom?

GH says to start the switch when you see pre-flowers or early blooms, optionally blending half-strength Grow and Bloom for 1 to 2 weeks.

Signs I'm feeding too much?

GH says to back off if you see dark, clawed leaves or tip burn.

Still not sure? Ask the growers.

Post your nutrients, how much you're feeding, your medium and a photo. Members who've run GH BioThrive will tell you what they'd change.

08

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09

More grow tools

These numbers are starting points, not rules. Strains, water, medium and light all change what a plant wants, so watch your plants and adjust.

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