For most home growers using FloraNova Grow in a standard vegetative feeding program, the go-to starting dose is around 3.6 ml per gallon for early growth, stepping up to 4.8 ml per gallon as plants get established and push harder. If you're running a more aggressive schedule, those numbers climb to 4.5 ml/gal for early growth and 6.0 ml/gal for late growth. You'll want your nutrient solution sitting at a pH of 5.0 to 6.5, with early veg EC hovering around 1.2 to 1.5 mS/cm (roughly 600 to 750 PPM on the 500 scale). That's the short version. Everything below breaks it down step by step so you're not guessing. If you're planning your first mhw botanical research grow, start by choosing a crop and matching the feeding and pH targets to what you're growing mhw botanical research what to grow.
How Much Floranova Grow Per Gallon: Exact Mixing Guide
What FloraNova Grow actually is (and which version you have)
FloraNova Grow is a one-part, liquid concentrate nutrient made by General Hydroponics. It's a heavy suspension, which means you'll notice it settles in the bottle if it sits for a while. Always shake it before measuring. The formula is designed to cover all macro and micro nutrients in a single bottle, which makes it popular with growers who don't want to juggle a three-part system. It's labeled for both soil and hydroponic use, though how you apply it differs between those two methods (more on that later).
The product comes in a few bottle sizes (quart, gallon, etc.) but the concentrate strength is the same across sizes. What matters is whether you're working from the standard FloraNova Grow label or from the FloraNova Professional 8-Part Feed Chart, because the 8-Part system layers in additional supplements on top of the base FloraNova dose. For most home growers just using FloraNova Grow as a standalone, you're working from the base nutrient column of that feed chart. If you bought FloraNova Grow from a hydro shop and it came in a single dark bottle, you're good to follow the doses in this article.
Nutrient dilution basics: EC, PPM, pH, and measuring per gallon
Before you mix anything, you need a way to verify that your nutrient solution is actually where it should be. A cheap pen-style EC meter or a combined EC/PPM meter is essential here. General Hydroponics explicitly recommends monitoring strength with a conductivity or PPM meter, and once you've used one a few times, it becomes second nature.
EC stands for electrical conductivity and measures how many dissolved salts (nutrients) are in your water. PPM (parts per million) is just EC converted to a number scale, and the two most common scales are the 500 scale and the 700 scale. General Hydroponics' feed charts use the 500 scale, so if your meter uses the 700 scale, your readings will come out about 40% higher for the same solution. Make sure you know which scale your meter uses before comparing numbers. <a data-article-id="C878B3D2-3614-41FA-9DCB-D13AF6D3F396"><a data-article-id="C878B3D2-3614-41FA-9DCB-D13AF6D3F396">Valerian grow best</a></a> when you match the timing and growing conditions to the type of setup you have, including light and soil or hydro practices.
Your target pH range for FloraNova Grow is 5.0 to 6.5 according to the product label. In practice, most hydroponic growers aim for 5.5 to 6.2, and soil growers push closer to 6.0 to 6.5 since organic matter in soil buffers and interacts with nutrient availability differently. Always measure pH after you've added and mixed your nutrients, not before, because FloraNova Grow will shift your water's pH. Use a calibrated pH meter or reliable pH drops, and keep pH Up/Down on hand to dial it in.
How much FloraNova Grow per gallon by growth stage
The dose changes as your plants move through their growth stages. Younger plants and seedlings are sensitive, so you start lower and work up as roots and foliage develop. Here's how the dosing breaks down across the two most common program intensities.
| Growth Stage | Light/Medium Program | Aggressive Program | Target EC (mS/cm) | Target PPM (500 scale) |
|---|---|---|---|---|
| Seedling / Early Veg | 3.6 ml/gal | 4.5 ml/gal | 1.2 – 1.5 | 600 – 750 |
| Established Veg / Late Growth | 4.8 ml/gal | 6.0 ml/gal | 1.5 – 2.0 | 750 – 1000 |
For seedlings in their first week or two after sprouting, I'd actually recommend starting even lower, around half the early growth dose, about 1.8 ml/gal, and verifying EC before feeding. Seedlings have tiny root systems and can't handle a full nutrient load yet. Once you see true leaves developing and roots actively growing, step up to the early growth dose. From there, increase to the late growth numbers only when plants are clearly vigorous and drinking heavily.
If you're running the aggressive schedule, do so only when your plants have a proven track record of tolerating nutrients and your water quality is dialed in. Aggressive dosing in hard water (high starting EC from minerals in tap water) can push your solution EC dangerously high before you've even mixed much product. Always check your baseline EC before adding anything.
Step-by-step mixing: order matters more than you think
Mixing FloraNova Grow in the wrong order is one of the most common causes of nutrient lockout. Because it's a heavy suspension with chelated minerals, it reacts with other compounds in your water. Here's the process I follow every time.
- Start with plain water at your desired temperature (65 to 75°F is ideal). Fill your reservoir or mixing container to the target volume.
- Shake the FloraNova Grow bottle well for at least 30 seconds before measuring. The heavy particles settle and if you pour without shaking, your dose will be weaker than intended.
- Measure your dose using a graduated syringe or small measuring cup. Do not estimate by eye. A 5 ml syringe gets you accurate enough for single-gallon mixing.
- Add FloraNova Grow to the water while stirring. Never dump concentrate into a dry container before adding water.
- If you're using any additional supplements (Cal-Mag, silica, etc.), add those separately, one at a time, stirring between each addition. Silica always goes first if you use it, and it should be added to plain water before FloraNova.
- Once everything is mixed, check EC/PPM to confirm you're in the target range.
- Adjust pH last, after all nutrients are added and dissolved. Use pH Up or pH Down in small drops, stir well, and re-check.
- Let the solution sit for five minutes and check EC and pH one more time before using.
The most common mistake I see is adding pH adjusters before the nutrients, then re-adjusting after and overshooting. Another one is mixing FloraNova directly into a small amount of water and then topping up, which creates concentration pockets that don't fully dissolve. Always mix into your full final volume. And never mix FloraNova directly with any other concentrate before diluting in water first. That's how you get precipitates that clog drip lines and cause uneven nutrient delivery.
FloraNova in hydroponics vs soil: same rate?
The per-gallon rate on the label applies to both systems, but how you manage and interpret those doses is different between hydro and soil. In hydroponics, nutrients go directly to roots with no buffering medium in between, so what you mix is exactly what the plant gets. That means you need to be precise and consistent, and you need to monitor your reservoir EC actively, especially as plants consume water and nutrients at different rates.
General Hydroponics specifically recommends draining and replacing your nutrient solution every one to two weeks to prevent nutrient imbalance. As plants drink, the ratio of nutrients shifts because they absorb some elements faster than others. If you just keep topping off with fresh solution without ever doing a full reservoir change, you'll end up with mineral buildup and pH drift. When your reservoir EC is creeping up between top-offs, add plain pH-adjusted water to dilute back to your target range rather than adding more nutrients.
In soil, things work a bit differently. Soil (especially mixes with compost or coco buffered with calcium and magnesium) naturally holds nutrients and has some cation exchange capacity that buffers the solution. This means soil can hold back nutrients and release them slowly, so you're less likely to hit a sudden deficiency between waterings, but you're also more at risk of salt buildup over time. For soil growers, I recommend starting at the lower end of the dose range and watering to runoff occasionally to flush excess salts. Soil pH should be kept closer to 6.0 to 6.5 (vs the 5.5 to 6.2 sweet spot in hydro) to keep nutrient availability optimal for soil biology.
If you're growing in coco coir, treat it more like hydroponics than soil. Coco has very little nutrient buffering on its own, feeds daily or twice daily in many systems, and wants the same pH range as hydro (5.5 to 6.2). Use the hydro approach for coco and you'll be in good shape.
What over and underfeeding look like, and how to fix it
Signs you're feeding too much
- Leaf tip burn: the very tips of leaves turn brown or crispy, starting at the outer edges. This is classic nutrient burn from excess EC.
- Clawing or 'taco' leaves: leaf edges curl downward and under, often a sign of nitrogen toxicity from over-dosing a grow formula.
- Dark, almost bluish-green foliage: overly dark leaves usually mean nitrogen excess, a common result of pushing the aggressive FloraNova dose too early.
- Slow or stalled growth despite healthy-looking water: high EC can create osmotic stress that actually prevents water uptake even when nutrients are present.
Signs you're not feeding enough
- Yellowing of older, lower leaves (starting from the bottom up): this is classic nitrogen deficiency, the first thing to show up when FloraNova Grow is under-dosed.
- Pale, light green overall coloration: the whole plant looks washed out, not just the lower leaves.
- Slow growth and thin stems: plants that aren't getting enough nutrients during veg stall and stay small.
- Small, widely spaced internodes with weak branching: another sign of overall nutrient deficiency slowing development.
How to adjust
If you see burn symptoms, immediately mix a fresh batch of nutrient solution at a lower dose. Drop back by about 20 to 25% (for example, from 4.8 ml/gal to around 3.6 ml/gal) and verify the EC comes down to your target range. In hydro, drain the reservoir and refill with the corrected solution. In soil, flush with pH-adjusted plain water (two to three times the container volume) to push out excess salts, then resume feeding at the lower rate once runoff EC drops.
If you see yellowing or deficiency signs, first check your pH before assuming you need to add more nutrients. A pH that's drifted out of range is the most common cause of apparent deficiency even when the nutrient solution is properly mixed. If pH is fine, bump your dose up by one step and re-check plant response in three to five days. Don't overcorrect all at once.
Quick reference dilution table and next steps
| Growth Stage | Light/Medium (ml/gal) | Aggressive (ml/gal) | Per Liter (Light/Med) | Per Liter (Aggressive) | Target pH | Target EC | Target PPM (500 scale) |
|---|---|---|---|---|---|---|---|
| Seedling (first 1-2 weeks) | ~1.8 ml | ~2.25 ml | ~0.48 ml | ~0.59 ml | 5.5 – 6.5 | 0.8 – 1.0 | 400 – 500 |
| Early Veg / Early Growth | 3.6 ml | 4.5 ml | 0.95 ml | 1.19 ml | 5.5 – 6.5 | 1.2 – 1.5 | 600 – 750 |
| Established Veg / Late Growth | 4.8 ml | 6.0 ml | 1.27 ml | 1.59 ml | 5.5 – 6.5 | 1.5 – 2.0 | 750 – 1000 |
If your plants are showing symptoms right now, here's what to do immediately. Check EC and pH first before changing your dose. If EC is in range but pH is off, fix pH and wait three to five days to see if the plant recovers. If EC is too high, dilute with plain water or mix a fresh lower-dose batch. If EC is too low and pH is fine, bump your dose by 20% and reassess in a few days. In hydro, if you haven't done a full reservoir change in more than two weeks, drain and start fresh with a clean mix.
For ongoing dosing schedules, it's worth looking at how often to use FloraNova Grow alongside the per-gallon rate, since feeding frequency interacts directly with how much total nutrient load your plants receive. If you're also comparing FloraNova to other single-part nutrient lines, checking out terra grow dosage and floranova grow dosage side by side can help you decide whether FloraNova's dilution rates match up to what you're used to with other products. If you need to dial in the exact right amount, use this floranova grow dosage guide for your growth stage and setup. If you want a flora-based alternative focused on CO2 and carbohydrate-driven growth, compare it with common flora grow carbo CO2 alternatives before choosing your program. A good way to set the right strength is to compare the terra grow dosage guidance to your current FloraNova Grow ml per gallon and EC readings.
FAQ
My meter scale is different, how do I know how much FloraNova Grow per gallon to mix accurately?
Use a calibrated meter to confirm EC in your final mixed solution, then back-calculate the ml/gal dose if needed. A common cause of “wrong” dosing is forgetting your meter’s scale (500 vs 700). If your EC is already high at the expected ml/gal rate, reduce nutrients and recheck after mixing thoroughly, then only adjust dose in small steps (about 10 to 20%).
Can I measure FloraNova Grow in half a gallon (or liters) instead of a full gallon?
The ml/gal rates in the guide assume you measure FloraNova Grow as concentrate and mix into the full finished gallon. If you only have part of the gallon, scale the ml proportionally (for example, half a gallon is half the ml). Avoid adding nutrients to a small amount of water and topping up later, because it can create uneven pockets that dissolve slowly.
Does shaking FloraNova Grow matter, and what happens if I don’t shake before measuring?
FloraNova Grow is a suspension, so settling changes how concentrated the bottle contents are at the moment you scoop. Shake well, measure promptly, and use the same technique each time. If you wait after shaking and the bottle settles again, you can get inconsistent ml/gal-to-EC results even when you “measure correctly.”
What should I do if I mixed too strong, EC is higher than target, but my plants still look hungry?
If you overshoot EC, the cleanest fix in hydro is to drain and refill, or dilute by replacing part of the reservoir with plain pH-adjusted water until you return to target EC. In soil, flush with pH-adjusted water (multiple passes) and watch runoff EC drop before resuming feeding. Avoid repeatedly adding more nutrients to “chase” deficiency when EC is already too high.
Should I set pH before or after adding FloraNova Grow, and why does it matter?
Mix into water with pH already roughly in the working range, then measure and correct pH only after nutrients are fully mixed. Do not adjust pH first and then add nutrients and assume pH stays put, because FloraNova can shift pH. Also, mix in the correct order (nutrients first, then pH adjust), so you don’t overshoot.
How do hard water minerals affect how much FloraNova Grow per gallon I should use?
FloraNova’s per-gallon rate stays the same, but the practical dose you need may change with water source. If your tap water starts with high baseline EC from dissolved minerals, the mixed EC can become “too strong” sooner than expected. Always measure your baseline EC before adding any nutrients, then compensate by reducing the FloraNova dose to hit the target final EC.
If I’m starting with seedlings, can I use the early growth ml/gal right away?
Yes, if seedlings show stress or slowed growth, drop to the lower start rate rather than using the early veg number immediately. The guide suggests about half the early-growth dose (around 1.8 ml/gal) for the first week or two after sprouting, then step up once true leaves and active root growth are evident. Recheck EC after feeding, not just the next day.
How can I compare FloraNova Grow per gallon to another nutrient brand without guessing?
If you must compare your ml/gal mixing strength to other nutrient lines, compare using final EC (and confirm the EC scale), not just the ml amounts. Different brands can have different nutrient concentration profiles, so two “recommended” ml/gal doses may not produce the same EC. Use your meter targets to decide whether to match FloraNova strength by EC rather than by label dose alone.
What’s the safest way to adjust FloraNova Grow dose if plants respond poorly after mixing?
Do it in small, measurable changes. For example, if you need to move from one stage rate toward the next, increase by about 10 to 20% and reassess in 3 to 5 days. Big jumps are more likely to cause temporary burn or lockout, especially if pH and EC drift are already near the edge.
How long can I top off a hydro reservoir before I should drain and refill?
For hydro, don’t rely on “topping off” for long periods. If you have not fully drained and replaced the reservoir in more than about two weeks, drain and start fresh with a clean mix, then rebuild dosing based on the new EC and pH targets. This prevents nutrient ratio drift even when your next top-off seems small.
