How to use this Flora Series tool
Set your options in the calculator above, read the result, then verify with a calibrated meter when the decision matters. Bookmark this page for reservoir day — consistent units beat copying numbers from charts that never name their scale or bottle rate.
Formula reference
ml = volume (gal) × rate (ml/gal) × strength
What this chart is (and isn’t)
FloraMicro, FloraGro, and FloraBloom are the classic General Hydroponics three-part liquid line. Growers still search “Flora Series chart” constantly because stage ratios change — more Gro in veg, more Bloom in fruiting.
Presets here follow widely published starting ml-per-gallon schedules. They are not a license from the brand, and they are not a substitute for an EC meter. Hard water, RO water, and crop load all move the real target.
Mix order that doesn’t wreck the jug
Add FloraMicro to water first and mix. Then FloraGro. Then FloraBloom. Never combine the concentrates together undiluted — they can precipitate and leave you with sludge instead of nutrients.
Adjust pH after the reservoir is mixed and stirred. Many leafy and herb runs land somewhere in the mid 5s to low 6s; fruiting crops still need stable readings more than perfect folklore numbers.
Hard water vs soft water
Some regions use FloraMicro Hardwater formulas when tap calcium/magnesium is already high. If your source water EC is already elevated, start milder and watch leaf tips before running “aggressive veg” charts.
RO or very soft water usually wants the full chart calcium/micronutrient contribution from Micro — don’t skip it to “save money.”
Frequently asked questions
Is this official General Hydroponics software?
No. HydroGrowLab is independent. Rates are approximate starting points aligned with common published Flora Series schedules. Always confirm with your bottle labels and an EC meter.
Can I mix Flora Series with MasterBlend?
Don’t stack random charts. Pick one complete program per reservoir. Use our Master Blend calculator only when you are running that dry-salt recipe.
What EC should Flora Series hit?
Seedlings stay soft; veg and bloom climb. Many home leafy tanks land roughly ~1.0–1.6 mS/cm and fruiting runs higher later — measure rather than assuming the chart’s ml always equals your meter.
Related calculators
- Master Blend Calculator — Dose MasterBlend 4-18-38, calcium nitrate, and Epsom salt by reservoir volume — classic dry-salt hydro recipe.
- Nutrient Mixing Calculator — Calculate exact nutrient amounts for your reservoir based on volume and concentration ratios.
- EC to PPM Converter (500 vs 700) — Convert between Electrical Conductivity (EC) and PPM across 500, 640, and 700 TDS scales.
- pH Adjustment Calculator (Up/Down) — Estimate how much pH Up or pH Down solution is needed to reach your target pH.
Keep learning
Pair this calculator with our pH & EC guide, crop targets in plant guides, and meter picks in product reviews.