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GH Maxi Series feeding schedule and calculator

General Hydroponics' official Maxi Series chart in all three strengths, scaled to the water you're mixing. Two dry powders, weighed in grams.

Checked Oct 20, 2026 Source: General Hydroponics Maxi Series Growth Stage Feedchart (USD, code 200824)
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

Grams or mL per gallon of water, as marked, at full strength

Light feed

Stage MaxiGro MaxiBloom EC
Grow 4.6 g 1.3–1.6
Bloom 3.9 g 1.4–1.7

Medium feed

Stage MaxiGro MaxiBloom EC
Grow 5.2 g 1.5–1.8
Bloom 4.4 g 1.6–1.9

Aggressive feed

Stage MaxiGro MaxiBloom EC
Grow 6.5 g 1.9–2.3
Bloom 5.5 g 2.2–2.6
03

Notes from the chart

  • Amounts are grams per US gallon (3.79 liters). A kitchen scale that reads 0.1 g is enough.
  • GH calls Maxi Series its professional outdoor 1-part system; it works indoors too.
  • Feeding charts are recommendations only. GH notes adjustments may be needed for your environment and setup.

Source: General Hydroponics Maxi Series Growth Stage Feedchart (USD, code 200824)

05

Threads worth reading

Discussions this page draws on

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Go deeper

Learn guides on THCFarmer

07

Common questions

Which feed strength should I use?

GH matches strength to how often you water and how big your plants are. Light is for frequent irrigation, small pots and sea of green. Aggressive is for big, topped plants watered once a day or less. If you're unsure, start light.

Why only two stages?

GH's Maxi Series chart is a growth-stage chart: one rate for grow and one for bloom. Use MaxiGro through veg and MaxiBloom through flower.

Still not sure? Ask the growers.

Post your nutrients, how much you're feeding, your medium and a photo. Members who've run GH Maxi Series 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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