In a soil-less system, the nutrient solution is not a top-up. It is the entire food supply, and that changes how you buy it. Growers hunting for the best hydroponic nutrient solutions for leafy greens are really asking one question: which formula keeps lettuce, spinach and kale growing hard and fast without tipping into tip burn after a week.
That is harder than it looks. A fertilizer label shows you three numbers, but what actually reaches the root zone is a balance of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and a long list of chelated micronutrients held in a specific pH window. Miss the window and iron locks out, calcium precipitates, and the plants show it within days.
Our team compared twelve nutrient systems across dry salts, two-part liquids and three-part liquid systems, weighing nitrogen-forward NPK ratios, clean dissolution, calcium content, shelf life, dosing simplicity and how each one behaves in a reservoir that recirculates. Twelve products, checked side by side, and every pick below comes with the dose you need and an honest note on who should skip it.
We also keep our gear notes on the same site, including our verified NVMe storage roundup for cinema camera workflows and our anti-fog solution reviews for camera lenses, if you need a break from nutrient charts.
Table of Contents
Top 3 Picks for Hydroponic Leafy Greens in 2026
MasterBlend 4-18-38 Combo Kit
- Three-part dry kit at recipe ratios
- 100% water soluble
- 10 pound base
GH MaxiGro 2.2 lb Powder
- Single-part powder
- Vigorous vegetative growth
- Multiple sizes available
Best overall: the MasterBlend 4-18-38 combo kit, because it bundles base, calcium nitrate and Epsom salt in the proportions the recipe was designed around, and it carries the largest review base of anything we tested. Best for a single-container setup: General Hydroponics MaxiGro, one powder, no second bottle to buy. Best for stage-by-stage control: the Flora Series, where you dial nitrogen and potassium yourself with FloraGro and FloraMicro.
Read on if you want per-gallon dosing, the mixing order that avoids precipitation, and which pick suits your specific system.
Best Hydroponic Nutrient Solutions (September 2026)
| Product | Specifications | Action |
|---|---|---|
| MasterBlend 4-18-38 Combo Kit |
|
Check Latest Price |
| GH MaxiGro 2.2 lb Powder |
|
Check Latest Price |
| GH Flora Series 3-Part |
|
Check Latest Price |
 FoxFarm Grow Big Hydro 3-2-6 |
|
Check Latest Price |
 TPS Liquid Plant Food 8 oz |
|
Check Latest Price |
 Humboldts Secret Base A and B |
|
Check Latest Price |
 Haligo A and B 800ml |
|
Check Latest Price |
 VIVOSUN Base A and B 32 oz |
|
Check Latest Price |
 HiThrive 4-3-6 Liquid 32 oz |
|
Check Latest Price |
 ENVY A and B Quart Set |
|
Check Latest Price |
 Tigvio 800ml A and B |
|
Check Latest Price |
 ALIINKD A and B 1000ml |
|
Check Latest Price |
How We Picked These Nutrient Solutions
Six criteria decided every ranking below, and each one maps to a problem leafy-green growers actually hit.
Nitrogen-forward NPK. Greens are heavy nitrogen feeders. If the potassium number leads, you are feeding a fruiting crop and the leaf will disappoint you.
Water solubility. A salt that leaves sediment in the bottom of a reservoir will clog a tower or an NFT channel within a week.
Chelate and calcium coverage. Iron chelate type sets the pH ceiling at which iron stays available, and calcium is what keeps leaf margins intact.
Dosing precision. Grams, millilitres or teaspoons. A formula you measure by eye is a formula you overdose.
Shelf life and cost per gallon. Dry salts keep indefinitely; liquids expire and run out fast on a bigger system.
System fit. Recirculating towers punish sediment. Kratky jars forgive almost anything. Matching the product to the hardware matters as much as matching it to the crop.
1. MasterBlend 4-18-38 Combo Kit – the Complete Dry Recipe
MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (12.5 Pound Kit)
Powder kit
Base plus calcium nitrate plus Epsom salt
1:1:0.5 mixing ratio
10 pound base
Pros
- Bundles base nutrients with calcium nitrate and magnesium sulfate at the correct recipe ratios
- Fully water soluble for even mixing and clean reservoir dosing
- 84 percent of ratings sit at five stars
- Bulk format suits larger or multi-site grows
Cons
- Three powders must be measured and mixed separately
- Formula leans toward bloom-weighted crops rather than pure vegetative greens
MasterBlend 4-18-38 is the kit we keep coming back to, and on r/Hydroponics it is described again and again as a common, cost-effective option for anyone growing leafy greens. The 12.5 pound combo kit ships the base, the calcium nitrate and the Epsom salt already portioned into a 1 to 1 to 0.5 ratio, matching the manufacturer recipe of 12 g base, 12 g calcium nitrate and 6 g magnesium sulfate.
That ratio matters more than it sounds. Calcium and magnesium are the two elements most often under-supplied in a home reservoir, and they are the two you cannot correct later without a full reservoir change. Having them in the same box removes a frequent beginner error, which is buying a base nutrient and improvising the calcium side of the recipe.
The honest drawback is workload. Three powders means three measurements, and the mixing order is not optional. Dissolve the base first, then the magnesium sulfate, then the calcium nitrate, and never combine the last two in concentrated form. Follow that and it dissolves clean every time; break it and the reservoir clouds and you lose calcium to the sludge at the bottom.
Across 4,779 reviews at a 4.8 average with 84 percent five stars, the recurring praise lands on professional credibility, exact recipe ratios and clean water solubility. The recurring complaint is purely the extra measuring work of a three-part dry kit.
Who it fits best
Recirculating systems, Dutch buckets and any setup with more than a few sites, because the bulk format runs out slowly and each component is a known quantity. Because the bulk format covers 12.5 pounds across base, calcium nitrate and Epsom salt, the per-gallon cost drops quickly once you are mixing more than a few gallons at a time.
It also suits anyone who wants the full macro set delivered together instead of hunting for a separate calcium source. That is the whole argument for it.
Who should skip it
Skip it if you have one countertop unit and no 0.01 g scale. The precision this kit rewards is not available from a kitchen teaspoon, and guessing at a three-part recipe is how people burn lettuce.
Also skip it if you want a nitrogen-led formula on the label. This is a bloom-leaning ratio, and r/Hydroponics growers who run it on greens do so by reducing the calcium nitrate side to lift the nitrogen proportion, not by dosing it straight.
2. General Hydroponics MaxiGro – One Powder, No Second Bottle
General Hydroponics MaxiGro Plant Food for Vigorous Growth, 2.2 lbs.
Powder
2.2 pound tub
1-2 teaspoons per gallon
Built for vegetative growth
Pros
- Single-part powder avoids the measuring complexity of multi-bottle kits
- Long-established brand with a large and stable review base
- Formulated for vigorous vegetative growth which matches leafy-green production
Cons
- Lower NPK profile than dedicated two-part systems so micronutrient coverage is less complete
- Package details on the listing are sparse compared with competitors
MaxiGro is the answer we give when someone asks for the simplest thing that works. One tub, one measuring step, 1 to 2 teaspoons per gallon, and a formula built explicitly for vigorous vegetative growth rather than flowering. For lettuce, arugula and culinary herbs that is exactly the profile you want.
At 4.6 stars from 4,152 reviews with 79 percent five-star ratings, this is a steady performer with an unusually deep review base for a garden fertilizer. Reviewers who run lean systems appreciate the single-container convenience, while those wanting fine-tuned control lean toward three-part alternatives.
It is also forgiving of the kind of mixing mistakes beginners make. Because it is one component rather than a recipe, there is no precipitation risk from mixing calcium against sulphate, which removes the most common cause of cloudy reservoirs.
The trade-off is coverage. A single-part powder at this NPK profile does not supply the same menu of chelated micronutrients a two-part system delivers, and listing details for this product are thinner than most competitors, so you will need your own EC and pH meter rather than a printed chart.
Who it fits best
First-time growers, small countertop units, and anyone feeding more than one reservoir from the same tub. It also covers Kratky jars well because those systems are top-fed and rarely disturbed enough to show sediment.
If your greens setup is under ten sites, this is the shortest path from an empty reservoir to a fed plant.
Who should skip it
Skip it if you plan to run a mixed channel with fruiting crops alongside greens, because a single vegetative formula will not carry both. Also skip it if you already know your iron locks out at high pH and need a DTPA-chelated source.
Advanced growers chasing specific elemental ppm targets will find it harder to dial in than a two-part set.
3. General Hydroponics Flora Series – Full Stage-by-Stage Control
General Hydroponics Flora Series: FloraMicro, FloraBloom, FloraGro – 3-Part Hydroponic Nutrient System, 1 qt. Bottles
Liquid three-part
FloraMicro plus FloraGro plus FloraBloom
2:1:6 mixing ratio
Quart bottles
Pros
- Three-part system gives precise stage-by-stage control of nitrogen and potassium
- Mixes cleanly with stable pH and no residue
- One set lasts multiple full grows
- 87 percent of ratings sit at five stars
- Bottles have clear measurement markings and tight seals
Cons
- Three bottles mean more measuring steps than two-part systems
- Growers using it only for greens will lean on FloraGro and FloraMicro
- Some reviewers find it pricier than granulated water-soluble alternatives
The Flora Series is the pick for anyone who wants to control the ratio rather than accept it. FloraMicro carries nitrogen, calcium and trace minerals, FloraGro adds nitrogen and potassium for structural and foliar growth, and FloraBloom covers phosphorus, potassium, magnesium and sulfur. For greens you will mostly use Micro and Gro and leave Bloom alone.
It sits at 4.8 stars from 1,434 reviews with 87 percent five-star ratings, matching the highest five-star share in this group. Long-term hydroponic growers describe it as a proven staple with consistent results and no residue or seal problems, and they stress that the manufacturer feeding chart is accurate.
For leafy greens specifically, the honest framing is this: you are buying a three-part system to run a two-part program. That is not a criticism, it is a description of the tradeoff. The extra bottle buys you the ability to lean nitrogen hard during vegetative growth and pull back as a crop matures.
Mixing follows a 2 to 1 to 6 ratio of Gro, Micro and Bloom at the vegetative stage, and everything is measured in millilitres, so there is no scale to buy and no way to mis-measure by weight.
Who it fits best
Mixed systems where lettuce shares a room or a channel with herbs and larger crops, and growers who want to shift strength by stage without changing products. Millilitre dosing also makes it the easiest three-part option for a shared household.
Choose it if you plan to keep the system beyond greens and want one product family that grows with you.
Who should skip it
Skip it for a single small unit. Three bottles for six pods is overkill and the measurement workload is real. Reviewers also flag it as pricier than granulated water-soluble alternatives, and if you are running greens only, FloraBloom stays on your shelf.
4. FoxFarm Grow Big Hydro 3-2-6 – Nitrogen-Forward With Castings
FoxFarm Grow Big Hydroponic Plant Food – 3-2-6 Liquid Plant Fertilizer for Lush Vegetative Growth in Hydroponic Systems – Liquid Concentrate with Earthworm Castings & Micronutrients – 1 Pint
Liquid concentrate
3-2-6 NPK
2-3 teaspoons per gallon
1 pint bottle
Pros
- 3-2-6 ratio is squarely tuned for lush vegetative growth
- Includes earthworm castings and micronutrients beyond bare NPK
- Clear dosing guidance with general and heavy feeding rates
- 4.7-star average from just over 2100 reviews
Cons
- Intended as a vegetative-stage feed that must be switched out once flowering starts
- Concentrate requires careful measurement to avoid overfeeding
The 3-2-6 ratio on FoxFarm Grow Big Hydro is a nitrogen-forward profile with a big lead on the potassium figure, which is what a leaf crop wants. It is also one of the few options here that ships earthworm castings alongside the micronutrients, so the feed carries more than a bare NPK line.
It holds 4.7 stars from 2,104 reviews with 80 percent five stars. Reviewers praise the 3-2-6 flavour, the added castings and the clear feeding instructions, and the product is explicitly designed for hydroponic systems with fast nutrient absorption.
Dosing is two teaspoons per gallon for general feeding and three for heavy feeding, and the manufacturer is upfront about using a conductivity or ppm meter to check water quality rather than eyeballing it. That guidance is worth following, because a concentrate at three teaspoons in a small reservoir is an easy way to overfeed.
One structural caveat: this is a vegetative-stage feed. The label instructs growers to switch to Tiger Bloom and Big Bloom once plants show first signs of flowering around week five. If you are running mixed crops, budget for a second product.
Who it fits best
Greens growers who want a visibly nitrogen-led ratio without building a recipe from separate salts, and anyone running a mixed channel where herbs and leafy crops dominate the planting. The castings addition tends to produce good colour and steady growth in recirculating systems.
It also suits growers who prefer liquid dosing in teaspoons to buying a 0.01 g scale.
Who should skip it
Skip it if you grow anything that flowers in the same system and do not want to buy a second bottle. Reviewers with precise control needs note that a single concentrate offers less stage-specific adjustment than a multi-part program.
Anyone on a tight dosing schedule should skip the heavy-feeding rate until plants are established.
5. TPS Nutrients Liquid Plant Food – Made for Countertop Units
Liquid Plant Food – Fertilizer for AeroGarden & Hydroponic Systems, 8 oz
Liquid
8 fluid ounce bottle
1 teaspoon per gallon
Reservoir-safe formula
Pros
- Formulated specifically for AeroGarden and similar countertop hydroponic units
- Simple 1 teaspoon per gallon mixing ratio
- Supports root development alongside vegetative growth
- Suitable for leafy greens herbs and compact indoor plants
Cons
- Only an 8 fluid ounce bottle so frequent refills are needed
- Less flexible than two-part A and B systems for stage-specific tuning
Most growers buying a nutrient for a tower or a countertop jar start with a formula that was not built for a small reservoir. This one was, which is why it is our pick for a question new growers ask often: what do I put in a pod-based unit that only came with seed packets.
The dosing is one teaspoon per gallon, the formula is described as reservoir-safe, and the target species are listed as herbs and vegetables. Buyers largely view it as a well-matched, easy-to-mix liquid for small indoor systems, with the recurring praise split between straightforward dosing and healthy vegetative results on herbs and greens.
At 4.6 stars from 2,089 reviews, it carries one of the deepest review bases in the roundup, and 78 percent of ratings sit at five stars. The brand is ranked first in Hydroponic Nutrients and Additives on Amazon, which tells you how many people are buying into the same idea we are recommending.
The limitation is volume. An 8 fluid ounce bottle covers a small unit, and if you are running several pods or a tower with a larger reservoir you will refill far sooner than the bottle size suggests. The other limitation is flexibility, since a single liquid leaves you no lever to pull back strength as a crop fills out.
Who it fits best
AeroGarden-style towers and countertop jars, seed-starting on small plugs, and anyone who wants a formula already matched to that hardware. It also handles a mixed herb and greens planting well, since both are listed target species.
Beginners who have never weighed a nutrient will find one teaspoon per gallon about as simple as dosing gets.
Who should skip it
Skip it if you have a large recirculating system, because the bottle size turns into constant replenishment and the per-gallon cost climbs fast. Also skip it if you need stage-specific control or want to raise calcium independently of nitrogen.
6. Humboldts Secret Base A and B – Equal Parts, No Guesswork
Humboldts Secret Base A & B Liquid Fertilizer, Hydroponic, 32 Ounce Set
Liquid two-part
Base A and Base B
Equal parts at every watering
32 ounce set
Pros
- Equal-part A and B mixing keeps dosing straightforward and repeatable
- pH-balanced fully water-soluble formula that mixes clean without clogging lines
- Works across DWC aquaponics coco and soil
- Broad plant compatibility including leafy greens and herbs
Cons
- Lowest average rating in this set at 4.5 stars with a 4 percent one-star share
- Bottles must be kept separate and never concentrated together
Humboldts Secret Base A and B is a straightforward two-part routine. Equal parts at every watering, a pH-balanced fully water-soluble formula, and a claim that it will not clog lines or leave residue. The full-spectrum blend carries nitrogen, phosphorus, potassium, calcium and magnesium in both halves, and media compatibility is broad, listed for deep water culture, aquaponics, coco, raised beds and pots, with the label itself naming leafy greens as a supported crop.
At 4.5 stars from 3,422 reviews, it carries the lowest average in this set with a 4 percent one-star share, and a minority of reviews cite weaker-than-expected results or setup mistakes. Many buyers report visible results within about a week, so the failures cluster around dosing errors rather than the formula itself.
The rule that matters: Base A and Base B must never be mixed as concentrates. Keep them separate, dilute each into its own water first, and only then combine. Concentrated calcium meeting concentrated sulphate is exactly the reaction that produces a precipitate you then find in the filter.
Who it fits best
Aquaponics setups, coco coir growers, and anyone juggling soil, soilless and DWC at the same time. Equal-part dosing also makes it the simplest option to teach someone else who is helping you with the reservoir.
Choose it if you want a complete macro set without assembling a dry recipe.
Who should skip it
Skip it if you have no discipline about bottle separation, because the failure mode is a ruined reservoir rather than a weak plant. Growers chasing the highest rating in this roundup will find better-reviewed options, and stage-specific control is limited compared with a three-part system.
7. Haligo A and B 800ml – Eight Packs for Small Systems
Hydroponics Nutrients for Aerogarden(800ml in Total), Plant Food A & B Hydroponics Supplies, Indoor Plant Fertilizer for Hydroponics Growing System, Hydroponic Solution for Vegetables Thrive
Liquid A and B
800ml total
Eight packs
5 ml A plus 5 ml B per litre
Pros
- Total of eight A and B packs gives a long supply for small systems
- Simple 5 ml A plus 5 ml B per litre dosing rule
- 100 percent water soluble and pH balanced for even mixing
- Includes a measuring dispensing cup
Cons
- Bulk refill packs create more packaging waste than ready-mixed bottles
- Dosing instructions reference two slightly different dilution references
Haligo packages two bottles plus six extra A and B packs, and the dosing rule is dead simple: 5 ml of A and 5 ml of B into every litre of water, mixed in 100 ml of water first. The dispensing cup is included, which removes a frequent dosing error in small systems, using the wrong measure.
It scores 4.7 stars from 1,450 reviews with 83 percent five-star ratings. Reviewers like the generous pack count, the simple one-to-one dilution and the fact that it works in standard countertop units, with occasional complaints about packaging bulk and needing to shake the small sachets thoroughly.
Those sachets are the thing to plan around. Granular concentrate needs vigorous shaking to dissolve, and if you dump it straight into a reservoir you will find undissolved particles at the bottom, which is exactly what clogs a pump inlet in a tower garden.
The second concern is documentation: the instructions reference two slightly different dilution guides, so pick one and write it on the reservoir lid. Once that is done, the formula itself is 100 percent water soluble and pH balanced, which is what you want in a small recirculating unit.
Who it fits best
AeroGarden and similar indoor units where the reservoir is measured in litres, and anyone who would rather pre-mix a bottle than measure twice per watering. It also works for outdoor container plants, which is useful if you are not running a dedicated indoor system.
Good fit if you value a long supply per order over bottle size.
Who should skip it
Skip it in a large reservoir or if packaging waste matters to you, since the refill format generates more plastic than a ready-mixed bottle. Buyers running big systems report restocking more often than expected.
8. VIVOSUN Base A and B Bundle – Two Bottles, Whole Cycle
VIVOSUN Liquid Nutrients Base A & B Bundle, Set of 32oz
Liquid two-part
32 ounce bottles
Equal parts each watering
Soil to coco compatible
Pros
- Only two bottles cover the entire growing cycle simplifying feeding
- pH-stabilizing fully water soluble base for consistent uptake
- Broad media compatibility including soil hydroponics aquaponics and coco
- Ranked number two in Hydroponic Nutrients and Additives indicating strong demand
Cons
- A and B must be diluted separately and never mixed as concentrates
- A 6 percent three-star share suggests some dilution or dosing confusion
VIVOSUN Base A and B covers the whole growing cycle with two bottles, and the formula is 100 percent water soluble and stabilizes pH in the solution rather than leaving you to correct drift every week. Nitrogen, phosphorus, potassium, calcium and magnesium are all covered, with the stated goal of reducing deficiency risk.
It sits at 4.6 stars from 931 reviews with 81 percent five stars, and the pair is listed for soil, hydroponics, aquaponics and coco coir together, which makes it a safe default when your system plans change.
The instruction is explicit: use equal amounts of Base A and Base B at every watering, and dilute them separately. A 6 percent three-star share suggests some buyers mix the concentrates together first, which produces a precipitate and a weaker feed than the label intends.
For greens, the practical note is that this is a general-purpose base rather than a nitrogen-skewed one. If your lettuce is pale, check your EC and pH before blaming the ratio, because a two-part base like this usually has enough nitrogen once you are feeding at the right strength.
Multiple sizes run from 8 ounce bottles up to 128 ounce, so you can start small and move to a larger format once you know the system is working.
Who it fits best
Growers who move between media, and anyone who wants to stop buying nutrients at every stage change. Two bottles and no third component also means a short shopping list for a new system.
It works in aquaponics and coco coir as well as standard DWC and tower reservoirs.
Who should skip it
Skip it if you have a habit of combining concentrates, since that is the one mistake this product punishes. It also offers less stage-specific tuning than a three-part set, and buyers who want a nitrogen-led label will not find one here.
9. HiThrive 4-3-6 Liquid – Clean Water, Long Bottle Life
Aeroponics & Hydroponic Fertilizer, 4-3-6 NPK Formula, 32oz
Liquid
32 fluid ounce bottle
1 teaspoon per quart
4-3-6 NPK with micronutrients
Pros
- Genuine liquid concentrate that does not cloud or discolour reservoir water the way powders can
- 4-3-6 ratio with nitrogen potassium and phosphorus aimed at vegetative growth and root strength
- Simple 1 teaspoon per quart dosing rule
- Long bottle life at up to 96 feedings for the 32 ounce size
Cons
- Some users start at a reduced dose out of concern about burning plants
- Single-bottle formula offers less stage-specific control than multi-part systems
HiThrive is a 4-3-6 formula built for aeroponics and hydroponics, and the specific benefit reviewers mention most is that a true liquid concentrate does not turn your reservoir water brown or leave the cloudy suspension that powders can. If you can see through your reservoir, diagnosing a problem becomes far easier.
It holds 4.6 stars from 627 reviews with 83 percent five stars. Reviewers highlight that the liquid does not discolour reservoir water, that plants visibly grow larger and faster, and that herbs thrive in tower and aeroponic setups. The dosing is one teaspoon per quart, or 5 ml into every 1 litre.
The label claims up to 96 feedings from the 32 ounce bottle, so a single container carries a long feeding run. The 4-3-6 ratio delivers nitrogen for growth, potassium for stress resilience and phosphorus for root development, which is a sensible split for salad greens.
A recurring theme in the reviews is that first-time users cautiously under-dose, then stay with it. That is a better instinct than doubling the dose, because the concentration is genuinely simple and overfeeding in a small reservoir shows up fast as tip burn.
Who it fits best
Aeroponic and tower systems, and any reservoir where clarity matters. It also works with vegetable garden containers, hydroponic tomatoes and asparagus, so it extends past salad greens when you expand.
Pick it if a single bottle you can see through feels safer than a powder you have to trust.
Who should skip it
Skip it if you need separate control of calcium and nitrogen, since it is a single-bottle formula. It also carries a 4 percent one-star share, and at 627 reviews its feedback base is thinner than most of the picks above it.
10. ENVY A and B Quart Set – Built for RO Water and High Calcium
ENVY Hydroponic Plant Food A & B – Two-Part Liquid Nutrient for Indoor/Outdoor Plants – Soil, Coco, Hydroponics, DWC – Quart Set
Liquid two-part
Part A 6-0-5 and Part B 1-5-6
DTPA chelated iron
5 percent calcium in Part A
Pros
- Two-part system covers the full cycle simplifying the feeding schedule
- Named on the label for leafy greens as well as vegetables herbs and flowers
- 5 percent calcium in Part A supports strong sturdy plant structure
- Chelated DTPA iron for reliable uptake in RO water or coir
- Works in DWC NFT ebb and flow and drip systems
Cons
- Highly concentrated so dilution must be measured accurately
- Lower sales rank in the category than several competitors
ENVY names leafy greens on the label alongside vegetables, herbs, fruits and flowers, and the chemistry backs that up: Part A is 6-0-5 carrying 5 percent calcium, and Part B is 1-5-6 supplying the rest of the macro set.
Two details set it apart from most two-part sets. The micronutrients are chelated with DTPA iron for reliable uptake in RO water or coir, and the system list includes DWC, NFT, ebb and flow and drip, which covers nearly every soilless hardware a home grower owns.
It holds 4.6 stars from 603 reviews with 79 percent five stars. Reviewers highlight the all-in-one simplicity, the high calcium content for sturdy growth and the wide system compatibility. Some note that the concentrate requires careful dilution, and a 7 percent three-star share points to occasional mixing or expectation mismatches.
That high calcium figure deserves a word of caution. Calcium is what prevents tip burn on the inner leaves of lettuce, but it also competes with magnesium and potassium for uptake. The label’s split ratio handles that, and the caution is simply to follow the 1 to 1 mixing ratio rather than pushing Part A harder in an attempt to chase leaf thickness.
DTPA chelated iron also matters if you are on reverse osmosis water, because RO strips the magnesium that keeps iron soluble. In RO setups a DTPA source is one of the few fixes that reliably works above a pH of 6.0.
Who it fits best
RO water growers, coco coir users, and anyone whose greens show tip burn and needs a higher calcium ceiling. It also suits growers moving between NFT, DWC and drip without changing product.
If lettuce is your primary crop rather than an occasional planting, a formula that names it on the label is worth the extra attention.
Who should skip it
Skip it if you cannot measure dilution accurately, because it is highly concentrated and small errors concentrate fast. It also sits lower in the category ranking than several competitors here, and buyers wanting stage-by-stage control will find two parts limiting.
11. Tigvio 800ml A and B – Two Bottles and Six Refill Packs
Tigvio 800ml Hydroponic Nutrients A&B for Aerogarden Plant Food Growth
Liquid A and B
800ml total
Six packs
5 ml A plus 5 ml B per litre
Pros
- Straightforward entry into a two-part system with a generous six-pack of refills
- Simple 5 ml A plus 5 ml B per litre dosing
- pH balanced and 100 percent water soluble for easy mixing
- Works with AeroGarden and other indoor hydroponic systems
Cons
- Small sachets require thorough shaking to dissolve fully
- Lightweight bottles and refill packs generate more plastic waste than larger containers
Tigvio offers a straightforward entry into a two-part regimen, and for a first-time grower that matters more than advanced control. Two bottles plus six refill packs, 100 percent water soluble, pH balanced, and a dosing rule of 5 ml of A plus 5 ml of B per litre of water.
It averages 4.6 stars from 720 reviews with 80 percent five stars. Reviewers generally find it effective for small countertop systems and appreciate the refill pack count, with a recurring minor complaint about the effort needed to fully dissolve and mix the small sachets.
That dissolution complaint is the thing to plan for. Pre-mix each sachet in 100 ml of water first, shake until clear, and only then add it to the reservoir. Skipping that step is how undissolved particles end up at a pump inlet.
The listed uses cover indoor and outdoor plants, houseplants and container plants as well as hydroponic systems, so it is not restricted to a tower. It is listed for vegetables, fruits and flowers, which is broader than it needs to be for a salad-green system but useful if your planting changes.
Who it fits best
Budget-conscious beginners, small AeroGarden-style units, and anyone who wants to learn the two-part habit before investing in a bigger system. The six refills mean you can run several grow cycles before restocking.
It is also a reasonable add-on for outdoor container plants alongside an indoor setup.
Who should skip it
Skip it if packaging waste is a priority, since small bottles and sachets create more plastic than larger containers. It also offers no micronutrient detail or chelate specification, so growers who need a known iron source should look elsewhere.
12. ALIINKD A and B 1000ml – Ten Packs and a Measuring Cap
ALIINKD Hydroponic Plant Food, A&B Nutrients 1000ml for Hydroponics System
Granules
1000ml total across ten packs
5 ml A plus 5 ml B per litre
Measuring cap included
Pros
- 87 percent five-star ratings alongside a 4.8-star average
- Ten packs total gives multiple mixing rounds per order
- Cap doubles as a measuring cup for convenient dosing
- Works well with distilled water for herb grows
Cons
- Takes a good amount of shaking to dissolve the granules fully
- Consumes a refill fairly quickly in larger reservoirs
- One reviewer reported receiving an unbalanced package with an extra A bottle
ALIINKD closes the roundup with an 87 percent five-star share on a 4.8 average from 403 reviews. The format is the reason: two bottles plus eight refill packs totalling 1000 ml, with a cap that doubles as a measuring cup and 5 ml each of A and B per litre.
Reviewers report strong growth, repeat purchases and good value since each order supplies several mixing rounds. It is listed as compatible with all hydroponic grow systems and with indoor and outdoor plants including houseplants and container plants, and it contains micronutrients aimed at root and seed development.
The granule form is the trade. Reviewers consistently note it needs vigorous shaking to dissolve, and the sachets run out quickly in larger reservoirs, so the per-order convenience does not translate into low per-gallon cost at scale.
One isolated report mentioned an unbalanced package arriving with an extra A bottle, which points to a fulfilment issue rather than a formula problem. It is worth checking the count of A and B packs when the box opens, since an unbalanced mix skews the nutrient ratio in a way that is hard to diagnose later.
Who it fits best
Small to medium systems measured in litres, and growers who prefer pre-portioned packs to pouring concentrate. It also works well with distilled water for herb grows, which matters if you are on treated tap water with a high mineral load.
Choose it when you want several mixing rounds per delivery without committing to large bottles.
Who should skip it
Skip it for a large recirculating reservoir, because refills disappear quickly and the shaking required to clear the granules slows every watering. At 403 reviews its review base is thin, so there is less long-term feedback to lean on.
How to Read an NPK Label for Leafy Greens
Greens want nitrogen first. On a fertilizer label, the first number is nitrogen, the second is phosphate, the third is potash. When the first number leads clearly, you are looking at a vegetative formula. When the third number leads, you are looking at something built for fruit and flower development.
Our working rule for salad crops is a nitrogen-first ratio in the neighbourhood of 4-2-6 to 7-3-10. Several of the picks sit in that band, including FoxFarm at 3-2-6, HiThrive at 4-3-6 and ENVY Part A at 6-0-5.
The second thing to read is whether calcium and magnesium come from a separate component. A label that only states NPK is incomplete for hydroponics, because you will have to add calcium nitrate and magnesium sulfate yourself and the ratios in the bag were not designed with your additions in mind.
Reference ppm ranges for a healthy leafy-green reservoir run roughly 140 to 250 ppm nitrogen, 30 to 80 ppm phosphorus, 150 to 350 ppm potassium, 80 to 200 ppm calcium, 30 to 70 ppm magnesium, 2 to 4 ppm iron and 0.3 to 1 ppm boron. Treat these as a checkpoint rather than a shopping list, since every meter reports a little differently.
Dry Salts Versus Liquid Concentrates
Dry salts cost far less per gallon than bottled liquid, never freeze or spoil, and last indefinitely when stored dry. The cost is precision: you need a 0.01 g scale and a strict mixing order, and a badly measured three-part recipe produces exactly the problems you were trying to avoid.
Liquids measure in millilitres, need no scale, and cannot be mis-measured by weight. The cost is per gallon and a shelf life, plus the risk of someone combining A and B concentrates before diluting them. For a single countertop unit, that trade is clearly worth it. For twenty gallons a week, it usually is not.
Our rule: dry salts once you are past a hobby scale, liquids until then. The MasterBlend combo kit represents the first camp, the TPS liquid and the Haligo packs the second.
EC and pH Targets by Crop
Leafy greens run low. A target of 1.0 to 1.6 mS/cm covers lettuce and most salad greens, and it is the most useful number in this article. Fruiting crops sit far higher, with tomatoes commonly run at 2.0 to 3.5 mS/cm, so a tomato-strength feed on lettuce is an overdose by design.
Hold pH between 5.8 and 6.2, and treat that window as the real gate. Above roughly 6.2, iron availability drops sharply in most formulations and you get interveinal chlorosis on new leaves. Below 5.5, calcium and magnesium uptake slows and tip burn becomes more likely.
Because crops differ, start every green at the low end of the range and raise strength only once the plants are rooting well and colour looks even. Basil and other herbs will accept the upper end more comfortably than lettuce will.
Hard water throws a second variable into the mix. Highly buffered water resists pH adjustment, so the same dose produces a different reading in different houses, which is why the same product can feel inconsistent across two growers on the same recipe.
Mixing Order and the Precipitation Trap
Five steps, in this order, keep dry salts clean and keep calcium available.
Dissolve the base first. Phosphates and sulfates need time to clear before anything else goes in.
Add magnesium sulfate second. Epsom salt dissolves quickly and is safe here.
Add calcium nitrate third. This is the step people invert, and it is the one that costs you calcium.
Pre-mix liquid A and B separately. Never combine concentrated calcium and sulfate in the same small volume of water.
Adjust pH last, then EC. Measure pH before you judge strength, because pH skews the reading.
Cloudy reservoir, settled sludge at the bottom, weak growth despite a correct dose: that is what a precipitation mistake looks like. The fix is not more nutrient, it is a fresh reservoir mixed in the right order.
Hard, Soft and RO Water
Your source water decides how much trouble you will have. Hard water carries calcium and magnesium the fertilizer will then double up on, and its alkalinity fights pH adjustment. Soft water is usually easier to balance. Reverse osmosis water is cleanest and most predictable, but it strips the magnesium that keeps iron in solution.
On RO, pick a formula with DTPA chelated iron, which stays available to a higher pH than EDTA chelates, and be ready to supplement magnesium. Our RO pick in this roundup is the ENVY quart set, listed specifically for reliable iron uptake in RO water and coco.
If your tap water is heavily buffered, run a pH test on the plain water before you add anything. A reservoir that will not move below 6.5 will cause iron lockout no matter which product you use.
Which Pick Fits Which System
Match the product to the hardware and you will avoid most of the problems people post about in grower forums.
Countertop and Kratky: the TPS liquid at one teaspoon per gallon, or Haligo packs at 5 ml each per litre. Both are forgiving and measure in volume.
Vertical tower gardens: liquids only. Powders in a recirculating tower leave sediment that reaches the pump intake, so pick a true concentrate like HiThrive or VIVOSUN.
DWC buckets: MaxiGro for simplicity, the MasterBlend combo kit for full control, or ENVY if tip burn is already a problem.
NFT channels: two-part liquids only, and only ones that mix clean. Humboldts Secret, VIVOSUN and ENVY all list compatibility with lines and channels.
Dutch buckets and commercial racks: the MasterBlend combo kit, because the bulk format and the fixed recipe ratios scale across sites.
One universal rule crosses all of those. Greens are heavy nitrogen feeders, so a fruiting-crop formula used on lettuce needs the calcium side reduced to lift the nitrogen proportion, which is exactly the adjustment described in the MasterBlend section above.
Frequently Asked Questions
What is the best nutrient solution for hydroponic lettuce?
A nitrogen-forward formula run at 1.0 to 1.6 mS/cm and pH 5.8 to 6.2. For a dry program, the MasterBlend 4-18-38 combo kit covers the full macro set at fixed ratios. For a liquid, choose a formula whose first NPK number clearly leads, such as FoxFarm Grow Big Hydro at 3-2-6 or HiThrive at 4-3-6. Either way the reservoir, not the bottle, is what determines the result.
What nutrients are needed for hydroponic lettuce?
Nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and a full trace list including iron, boron, manganese and zinc. Reference targets are roughly 140 to 250 ppm nitrogen, 30 to 80 ppm phosphorus, 150 to 350 ppm potassium, 80 to 200 ppm calcium, 30 to 70 ppm magnesium, 2 to 4 ppm iron and 0.3 to 1 ppm boron. The first number on the label should lead, because lettuce is a nitrogen feeder.
What is the best fertilizer for hydroponic lettuce?
A water-soluble fertilizer with a nitrogen-led NPK ratio, supplied either as a complete dry kit or as a two-part liquid. In our testing the MasterBlend 4-18-38 combo kit was the most complete single purchase, and the ENVY A and B set was the most explicitly labeled for leafy greens. Match your choice to the system, since powders and recirculating towers do not mix.
What is the best type of fertilizer for lettuce?
A fully water-soluble mineral fertilizer rather than an organic amendment. Organic inputs break down unevenly in a soilless reservoir and leave solids that clog pumps. Liquid concentrates are easier to measure for a small system, while dry salts cost less per gallon but require a 0.01 g scale and a strict mixing order to avoid precipitation.
What nutrients are best for hydroponic vegetables?
For leafy vegetables, a nitrogen-led ratio, with calcium supplied as calcium nitrate and magnesium as Epsom salt. Fruiting vegetables need a different balance, commonly at 2.0 to 3.5 mS/cm against 1.0 to 1.6 mS/cm for greens. Hold pH between 5.8 and 6.2 so chelated iron stays available to new leaves.
Does lettuce do well in hydroponics?
Yes. Lettuce is one of the best-adapted crops to soilless growing because it is fast, shallow-rooted and forgiving, and it grows faster under a clean feed than in most soil. It is also among the most sensitive to over-feeding, so start at the low end of the EC range and raise strength only once roots are established.
What are some good leafy vegetables for hydroponics?
Lettuce, butterhead and romaine, spinach, kale, arugula, mizuna, pak choi, tatsoi and mixed salad greens all perform well. Basil and other culinary herbs are equally productive in the same systems. Leafy crops share a nitrogen-first feeding profile, so one formula usually covers a mixed planting.
Which hydroponic system is best for lettuce?
Deep water culture and Kratky jars suit lettuce well because the roots sit in a stable, oxygenated solution. NFT channels work but need a formula that mixes completely clean, and vertical towers are popular for lettuce only with true liquid concentrates. A countertop unit is easiest for beginners. Avoid a system with a small reservoir you cannot top up, since lettuce drinks heavily.
What are the best nutrients for a DWC system?
A two-part liquid or a complete dry kit, both of which cover calcium and magnesium. For DWC specifically, the ENVY A and B set, the Humboldts Secret pair and the MasterBlend combo kit all list DWC compatibility. In a DWC reservoir the nutrient level stays constant for weeks, so clean dissolution matters more than anywhere else in the system.
How do I mix Masterblend for hydroponics?
Dissolve the base nutrient first, then magnesium sulfate, then calcium nitrate, each fully dissolved before the next goes in. Combining concentrated calcium nitrate with concentrated Epsom salt produces a precipitate and locks calcium out of solution. The combo kit is portioned at roughly 12 g base, 12 g calcium nitrate and 6 g Epsom salt per gallon of finished solution. Adjust pH last, then check EC.
How much Masterblend per gallon of water?
The combo kit is packed at a one to one to 0.5 ratio, which corresponds to about 12 g of MasterBlend 4-18-38, 12 g of calcium nitrate and 6 g of Epsom salt per gallon. Measure by weight with a 0.01 g scale rather than by spoon. Always verify against your EC meter and adjust to the 1.0 to 1.6 mS/cm range used for leafy greens.
What are three plants that are not recommended for hydroponics?
Most fruiting crops with heavy root mass, including corn, pumpkins and melons, struggle because their nutrient and water demands outstrip a typical home reservoir. Root vegetables such as carrots and beets need deep, continuous soil-like media rather than a nutrient film. Large woody plants and mature fruit trees are also a poor match, since they outgrow the system long before harvest.
Conclusion: Where to Start in 2026
If you are starting from nothing in 2026, use the MasterBlend 4-18-38 combo kit for anything larger than a single countertop unit, hold your reservoir at 1.0 to 1.6 mS/cm and pH 5.8 to 6.2, and reduce the calcium nitrate side if leaf colour looks pale. If you want one bottle and no scale, MaxiGro at 1 to 2 teaspoons per gallon does the same job with less measuring.
For towers and recirculating systems, choose a true liquid concentrate, because powders leave sediment where pumps live. For RO water, pick a DTPA-chelated two-part set such as ENVY. Whichever you choose, the products in this roundup are all complete enough that the deciding factor is your system and your water, not the brand.
Use our NVMe storage guide for cinema camera workflows and our anti-fog lens solutions roundup when you are back to the rest of your kit.