The Flora Series feeding chart from General Hydroponics tells you how many milliliters of FloraMicro, FloraGro and FloraBloom to add per gallon at each growth stage. Seedlings start near 1.8 mL/gal of each part. Vegetative feeds lean on Micro and Gro, and bloom feeds lean on Bloom. Always add Micro to the water first, then Gro, then Bloom, and check EC and pH last.
| Stage | FloraMicro (mL/gal) | FloraGro (mL/gal) | FloraBloom (mL/gal) | EC (if listed) |
|---|---|---|---|---|
| Seedling | 1.8 | 1.8 | 1.8 | — |
| Early growth | 3.6–4.9 | 3.4–4.6 | 2.6–3.4 | — |
| Late growth | 6.0 | 5.6 | 4.2 | — |
| Early bloom | 7.6 | 6.6 | 8.5 | 2.0–2.4 |
| Mid bloom | 4.6 | 4.6 | 6.6 | 1.4–1.7 |
| Late bloom | 3.3 | 3.3 | 4.0 | 0.9–1.1 |
| Ripen | 2.0 | 2.0 | 3.2 | — |
Values are from the General Hydroponics FloraSeries feed program we reviewed. GH publishes several chart versions (including light, medium and aggressive tiers), so confirm against the current chart in GH’s resource library.
What Do the Three Parts on the Flora Series Feeding Chart Do?
| Part | Label N-P-K | Main job |
|---|---|---|
| FloraMicro | 5-0-1 | Nitrogen, calcium and chelated micronutrients; the base of every mix |
| FloraGro | 2-1-6 | Vegetative growth: leaves, stems, roots |
| FloraBloom | 0-5-4 | Flowering and fruiting: phosphorus and potassium |
Because calcium lives in FloraMicro, it must go into plain water before the other parts. General Hydroponics says to add FloraMicro to fresh water first, then FloraGro and FloraBloom, and never to mix undiluted concentrates together.
How Do You Read the Flora Series Feeding Chart?
- Rows are growth stages. Seedling, early and late growth, then bloom stages and ripening.
- Columns are the three parts, in milliliters per US gallon.
- The ratio shifts. In growth stages Micro and Gro are highest; in bloom, Bloom takes the lead.
- EC guidance. Where listed, use EC to confirm strength. Your tap water adds to the reading. See starting EC baseline.
- Tiers. Light, medium and aggressive versions exist. Start light for leafy greens and seedlings.
How Do You Mix GH Flora Step by Step?
- Fill the reservoir with fresh water. Note the starting EC.
- Shake each bottle.
- Measure FloraMicro and add it first. Stir well.
- Add FloraGro. Stir.
- Add FloraBloom. Stir.
- Check EC. Compare with the chart and adjust with water or more nutrient.
- Adjust pH last. Most crops do well around 5.5 to 6.5. See how to control pH.
Use a syringe or graduated cylinder marked in milliliters; kitchen teaspoons are too rough for small reservoirs. See nutrient mixing order for why order matters.
What Does a 5-Gallon Flora Series Feeding Chart Mix Look Like?
Multiply each mL/gal number on the Flora Series feeding chart by your reservoir size. Here is a 5-gallon example:
| Stage | FloraMicro | FloraGro | FloraBloom |
|---|---|---|---|
| Seedling | 9 mL | 9 mL | 9 mL |
| Late growth | 30 mL | 28 mL | 21 mL |
| Early bloom | 38 mL | 33 mL | 42.5 mL |
| Mid bloom | 23 mL | 23 mL | 33 mL |
For a 10-gallon tote, double these numbers. For a 1-quart Kratky jar, divide the per-gallon number by four.
How Do You Use the Flora Series Feeding Chart for Vegetables?
- Lettuce, herbs and greens: use the seedling to early-growth range for the whole crop. Leafy crops rarely need late-growth strength. See leafy vs fruiting recipes.
- Tomatoes, peppers, cucumbers: follow growth stages until flowers appear, then move to bloom ratios.
- Mixed systems: if greens and tomatoes share a reservoir, feed for the most sensitive crop and accept slower fruiting. See multi-crop reservoirs.
Why Does the Flora Series Feeding Chart Drop Strength in Late Bloom?
Look at the EC column: it peaks at 2.0–2.4 in early bloom, falls to 1.4–1.7 in mid bloom and ends at 0.9–1.1 in late bloom. The chart tapers feeding as flowers and fruit mature instead of pushing harder to the end. For tomatoes and peppers that keep flowering for months, many home growers hold mid-bloom rates as long as the plant keeps setting new fruit, then watch leaf color and EC to fine-tune.
How Do You Convert the Chart’s EC to PPM?
Meters that read ppm use a conversion factor, usually 500 or 700. An EC of 1.4 reads about 700 ppm on a 500-scale meter and about 980 ppm on a 700-scale meter. Check your meter’s manual before you compare numbers on the Flora Series feeding chart with forum advice. See pH and EC meters.
How Often Should You Refresh a Flora Series Mix?
Between full changes, top off with plain water when EC is rising and with a weak nutrient mix when EC is falling. Replace the whole reservoir every one to three weeks, sooner in small or warm systems. See topping off vs reservoir changes.
General Hydroponics also sells other base lines, such as FloraPro, the Maxi Series and FloraNova. Their charts are different, so don’t apply FloraSeries rates to them.
What Mistakes Happen With the Flora Series Feeding Chart?
| Mistake | Result | Fix |
|---|---|---|
| Adding Gro or Bloom before Micro | Cloudy solution, calcium lockout | Micro first, always |
| Mixing concentrates in one cup | Precipitate forms | Add each part to water separately |
| Using aggressive rates on lettuce | Tip burn, dark leathery leaves | Use the light tier of the Flora Series feeding chart |
| Ignoring tap-water EC | Stronger solution than intended | Subtract your baseline |
| Not adjusting pH after mixing | Deficiency symptoms despite feeding | Check pH last |
FAQs About the Flora Series Feeding Chart
How much GH Flora per gallon does the Flora Series feeding chart call for?
It depends on stage: about 1.8 mL/gal of each part for seedlings, rising to roughly 6 mL Micro, 5.6 mL Gro and 4.2 mL Bloom in late growth on the chart we reviewed.
What order do you mix Flora Series?
FloraMicro first, then FloraGro, then FloraBloom, each into water, never into each other.
Can I use only FloraGro and FloraBloom?
No. FloraMicro supplies the calcium and micronutrients. Skipping it leaves plants short.
Is the Flora Series feeding chart in teaspoons?
GH’s charts are in milliliters per gallon. One teaspoon is about 5 mL.
Do I need CALiMAGic with Flora Series?
Often only with RO or very soft water. See calcium and magnesium deficiency.
Related HydroponicEra Guides
- Best hydroponic nutrients
- One-part vs two-part vs three-part nutrients
- EC and TDS in hydroponics
Sources
- General Hydroponics — FloraSeries feed charts (resource library)
- General Hydroponics — FloraMicro
- General Hydroponics — FloraGro
- General Hydroponics — FloraBloom
- Penn State Extension — Nutrient Solution Programs and Recipes