Hydroponic Nutrients Series: HY-GEN HYDRO GROWTH TWO PART explained

By Laszlo Bulatko | Updated 28 June 2026

I have been testing hydroponic nutrients in my Sunshine Coast workshop since November 2024, feeding lettuce, basil, and coriander on a 15-pod test bench with two-part nutrient sets. HY-GEN HYDRO GROWTH TWO PART is the vegetative-stage hydroponic nutrient I stock for trade resellers and use myself, because the Australian-made formulation has been consistent on calcium delivery without locking out iron or magnesium across the reservoirs I have run. This article is the technical breakdown I would give a customer asking what is actually in the bottle and how to use it.

Quick answer: HY-GEN HYDRO GROWTH TWO PART is an Australian-made, growth-stage hydroponic nutrient set built around calcium nitrate, potassium nitrate, and magnesium sulphate (each 10-30 percent by weight per the manufacturer's safety data sheet, April 2023). It is paired with HY-GEN HYDRO BLOOM for the flowering stage. The concentrate pH sits at 3.9 to 4.3; the working nutrient solution is buffered by the grower to pH 5.5 to 6.5 and EC 1.2 to 2.0 mS/cm during vegetative growth, in line with published hydroponic horticulture guidance.

If you are a hydroponic retailer, a market gardener, or a serious home grower comparing two-part nutrient sets for an Australian setup, this is the practical breakdown of what HY-GEN HYDRO GROWTH delivers, the verifiable composition data, and the dilution discipline that gets the most out of it.

What are hydroponic nutrients?

Hydroponic nutrients are water-soluble mineral concentrates that supply the 14 essential elements plants normally pull from soil: nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, iron, manganese, copper, zinc, boron, molybdenum, chloride, and nickel. The grower dilutes them into the reservoir water at a controlled electrical conductivity (EC) and pH, and the recirculating pump delivers the solution straight to the root zone on a timer.

In a soil pot, the same elements are released slowly as soil microbes break down organic matter, and uptake depends on temperature, moisture, and root contact with the soil matrix. In a hydroponic system, those variables are removed. The grower sets the elemental ratios, the pH window, and the EC; the plant then receives the calibrated solution on every pump cycle. The trade-off is that the grower is now responsible for the chemistry that the soil used to handle automatically, which is why a properly balanced two-part formula matters. Good nutrients for hydroponic plants do the job soil chemistry handles in the ground, on a schedule the grower sets.

Why hydroponic plants need a calibrated formula

A hydroponic system has no soil buffer. If calcium drops, the plant develops blossom-end rot or tip burn within days. If iron locks out because pH drifted above 6.5, new leaves yellow within a week. A well-engineered nutrient solution delivers all 14 elements in proportions tuned to the growth stage, plus enough chelation (the EDTA in the trace-element pack) to keep micronutrients available across the working pH range. The pH and EC targets matter as much as the elemental ratios themselves.

Mineral-salt nutrients versus organic nutrients

Hydroponic nutrients like HY-GEN HYDRO GROWTH are mineral-salt formulations: the elements are supplied as fully water-soluble salts that dissolve completely and deliver a precise, repeatable EC, which is exactly what a recirculating system needs. Organic nutrients (fish, kelp, and other carbon-based feeds) can grow plants too, but in a hydroponic reservoir they tend to feed microbes, cloud the solution, clog drippers and NFT channels, and release their elements unpredictably as they break down. For soilless systems where the grower wants to set the chemistry exactly, a soluble mineral-salt set is the standard choice; organic feeds are better suited to soil and media beds where the soil biology does the conversion work.

HY-GEN HYDRO GROWTH TWO PART: verified composition

The composition data below comes from the manufacturer's Safety Data Sheet (HY-GEN Holdings Pty Ltd, issued 23 April 2023), which is the only publicly verifiable specification on the product. I would rather quote the SDS than guess at numbers the supplier has not published.

Source: HY-GEN Holdings Pty Ltd Safety Data Sheet for HY-GEN HYDRO GROW A & B, issue date 23 April 2023, Section 3.

Concentrate pH is 3.9 to 4.3 (SDS Section 9). The concentrate is non-flammable, non-corrosive, and soluble in water in all proportions. All 11 listed constituents appear on the Australian Inventory of Chemical Substances. HY-GEN HYDRO GROWTH ships as a liquid concentrate rather than a powder, so the two parts pour and dilute straight into the reservoir water.

One thing the SDS percentages do not give you directly is the N-P-K number you see on most fertiliser labels. N-P-K is the ratio of nitrogen (N), phosphorus expressed as phosphate (P₂O₅), and potassium expressed as potash (K₂O), printed as three figures by weight of the finished product. HY-GEN lists raw ingredient bands (calcium nitrate, potassium nitrate, magnesium sulphate) rather than a single front-label N-P-K stamp, because a two-part concentrate only reaches its final N-P-K ratio once Part A and Part B are diluted together in the reservoir. When you compare two-part sets, read the ingredient list and the working-solution analysis, not just a headline N-P-K number.

Why the two parts are split

Calcium nitrate (Part A) and the phosphate + sulphate ingredients (Part B) cannot be co-concentrated in one bottle. Calcium reacts with sulphate to form calcium sulphate (gypsum) and with phosphate to form calcium phosphate, both of which are poorly soluble and precipitate as a white sludge that the grower then has to filter out of the system. Splitting the formula into Part A and Part B keeps calcium isolated from those reactive anions until the moment of dilution, when the working concentration is too low for precipitation to occur. This is the standard approach across every reputable two-part hydroponic nutrient on the Australian market.

Two-part versus single-part: same final analysis

HY-GEN publishes that its two-part and single-part formulas share the same final analysis when fully dosed; the elemental ratios in the working solution end up identical (HY-GEN Product Guide, page 14). The two-part format is used by growers who want maximum solubility headroom in their concentrate stock, or who run mixed reservoirs and want fine control over calcium delivery. The single-part format is simpler for hobby growers who only want one bottle to dose. There is no chemistry advantage to one over the other in the working tank.

How HY-GEN HYDRO GROWTH supports hydroponic plants

Nutrient demand changes with growth stage

Hydroponic plants do not need the same elemental profile across their lifecycle. During the vegetative stage, nitrogen and calcium dominate: nitrogen for foliage, calcium for cell walls and root tip integrity. As the plant approaches early flowering, phosphorus and potassium demand climbs. HY-GEN HYDRO GROWTH is the vegetative and pre-flower formulation; it is designed to carry the plant from seedling through the start of bud formation. From that point, the grower transitions to HY-GEN HYDRO BLOOM, which shifts the N-P-K balance toward phosphorus and potassium for flowering and fruiting.

The role of calcium

Calcium nitrate is the largest single ingredient by composition range in the Part A bottle (10-30 percent w/w). Hydroponic systems demand more available calcium than soil growing, because there is no soil exchange capacity to buffer supply. Calcium does the cell-wall work, keeps root tips extending, and holds flowers on the stem long enough to set fruit. A short-term calcium deficiency in the vegetative stage shows up as tip burn on the newest leaves; a flowering-stage deficiency leads to flowers aborting before they set fruit. Once the calcium dose is right, the lettuce leaves come out thick and dark green, the basil stems hold their weight, and the harvest goes into the bag without papery edges. On the bench comparisons I have run, HY-GEN's Part A appears to sit at the upper end of the 10-30 percent w/w SDS band, and basil and lettuce stems held thicker at the third-week harvest than on the two generic two-part sets I trialled in early 2025.

Trace elements and EDTA chelation

The trace elements (iron, manganese, copper, zinc) sit under one percent each and are chelated with EDTA. Chelation matters because micronutrients like iron oxidise and precipitate out of solution above pH 6.5 if they are not bound to a chelating agent. EDTA holds them in available form across the typical hydroponic working pH window of 5.5 to 6.5. Boron and molybdenum are listed without EDTA in the SDS because both elements remain soluble across that pH range without chelation.

Spotting nutrient deficiencies in the working tank

Because a hydroponic reservoir has no soil buffer, a deficiency shows on the plant within days rather than weeks. Most vegetative-stage problems trace back to either an element running low or a pH drift that has locked an element out of solution. The table below maps the common symptoms to the likely cause and the first thing to check.

The fastest diagnostic is almost always a pH and EC reading: a meter tells you in seconds whether the cause is a low dose (EC) or a lockout (pH) before you reach for any supplement. This is general horticulture guidance — confirm against your own reservoir readings.

How to use HY-GEN HYDRO GROWTH

Working solution targets

HY-GEN publishes the concentrate composition but not a public dilution chart; the printed product label is the authoritative source for the dose rate per litre. For target ranges in the working tank, Sustainable Gardening Australia and the standard commercial NFT horticulture references put leafy-green and herb vegetative ranges at pH 5.5 to 6.5 and EC 1.2 to 2.0 mS/cm, and the NSW Department of Primary Industries' hydroponics guidance covers the same nutrient-solution pH and EC management for leafy crops. Fruit-bearing crops (tomato, capsicum, strawberry) sit at the higher end of EC 2.0 to 2.5 mS/cm by the time they reach early flower. The grower measures, adjusts with pH up or pH down solution, and tops up with fresh nutrient as plants draw the reservoir down. Do not top up with raw concentrate without re-checking EC afterwards; the easiest way to wreck a 4-week lettuce crop is to assume the meter does not need a second look.

I run a Digital 4-in-1 Water Quality Tester (pH, TDS, EC, temperature) on every reservoir I build at the Sunshine Coast workshop -- a $49.90 pen-style meter saves more in avoided crop failures than a single bag of supermarket basil. See the Digital 4-in-1 Water Quality Tester product page for the full spec.

Water source and quality

Your starting water sets the baseline the nutrient is added on top of, so measure it before you dose. Check the bare water with an EC meter first: rainwater and reverse-osmosis (RO) water usually read close to zero, which gives you a clean slate; hard tap water can already carry 0.3 to 0.5 mS/cm of dissolved calcium and magnesium, which adds to the final EC and can push calcium higher than the formula intends. Raw chlorinated or chloraminated tap water is best avoided for recirculating systems. Standing the water for a day off-gasses free chlorine, but chloramine — common in Australian town water — does not off-gas, so filter it with activated carbon or switch to rainwater or RO before mixing. If you are on hard water, dose to the EC target rather than the label volume so the minerals already in the water are counted in.

Reservoir temperature

Nutrient uptake and root health both depend on solution temperature, and it is the variable growers most often overlook. Aim to keep the working reservoir around 18 to 22 degrees Celsius. Warm solution (above roughly 24 degrees) holds less dissolved oxygen and favours root pathogens such as Pythium, which is why summer crops on a sunny bench can stall even when the EC and pH read correctly; cold solution below about 15 degrees slows uptake and growth. In a south-east Queensland summer this usually means siting the reservoir out of direct sun and, on a larger bench, shading or insulating the tank. General horticulture guidance — the exact optimum shifts a little by crop.

Mixing steps for the working reservoir

1. Fill the reservoir with the target water volume (rainwater or filtered tap water; avoid raw chlorinated tap water).
2. Add the Part A dose specified on the printed bottle label and stir for 30 seconds.
3. Add the Part B dose specified on the printed bottle label and stir again for 30 seconds. Never combine Part A and Part B directly without water in between -- the precipitation chemistry from the composition table applies.
4. Measure EC: target 1.2-2.0 mS/cm for leafy greens and herbs in the vegetative stage; 2.0-2.5 mS/cm for fruiting crops at early flower.
5. Adjust pH to 5.5-6.5 using pH up or pH down solution. Re-stir after adjustment.
6. Re-measure both EC and pH after 24 hours; the working tank can drift as plants draw nutrients down, especially in the first week of a fresh reservoir.

Crop-specific working ranges (general guidance)

EC and pH ranges are general hydroponic horticulture guidance for the working tank, drawn from Sustainable Gardening Australia and standard commercial NFT references. The Part A and Part B dose rate per litre that achieves these EC targets is printed on the HY-GEN bottle label and is the authoritative source for the exact dilution.

Application schedule

HY-GEN HYDRO GROWTH is dosed continuously from seedling germination through to the start of bud or fruit formation. Reservoir top-ups happen as plants draw the level down (typically every 5-7 days in a small kitchen system, every 24-48 hours in a commercial NFT bench). A full reservoir flush every 7 to 14 days resets accumulated salts and prevents nutrient lockout. The flush replaces all reservoir water with fresh, freshly dosed solution.

Best uses

• Seedlings and cuttings: half-strength dose for the first 7 to 10 days while the root system establishes
• Vegetative leafy growth: full vegetative-strength dose targeting EC 1.2-1.5 mS/cm for lettuce, basil, herbs, and leafy greens — see our hydroponic herb garden guide for a worked herb example
• Pre-flower transition: continued use of HY-GEN HYDRO GROWTH until visible bud formation, then transition to HY-GEN HYDRO BLOOM
• Foliar spray: the highly soluble formulation works as a foliar application, supplementing root uptake during fast-growth phases
• Inert substrate compatibility: validated by the manufacturer for NFT, expanded clay (LECA), perlite, and other soilless substrates

We use HY-GEN HYDRO GROWTH on the demo units we run at south-east Queensland shopping-centre displays, alongside microgreens and herb crops. Shoppers pinch a basil leaf at the three-week mark, sniff it, then ask what we are feeding it. Enough of them wrote the bottle name down on their phone for me to keep HY-GEN on the reseller list.

Common mistakes to avoid

• Combining Part A and Part B neat: never pour the two concentrates together before they are diluted in the reservoir water — that is exactly the calcium-precipitation reaction the two-part split exists to prevent.
• Topping up with raw concentrate: add fresh nutrient to water and then re-check EC; tipping concentrate straight into a drawn-down tank spikes the EC and can burn roots.
• Trusting a single reading: re-measure EC and pH after 24 hours and through the week — a fresh reservoir drifts as plants feed.
• Letting pH sit outside 5.5-6.5: even a correctly dosed tank locks out iron and calcium once pH climbs above 6.5.
• Ignoring reservoir temperature and starting-water quality: both quietly change what the plant actually receives, no matter how carefully you dosed.

Pairing with HY-GEN HYDRO BLOOM

HY-GEN HYDRO GROWTH is one half of a complete vegetative-to-flowering nutrient program. Once buds or fruit start forming, the grower switches to HY-GEN HYDRO BLOOM, which redistributes the elemental balance toward phosphorus and potassium for flowering. The two formulas are designed to run as a sequence rather than a blend: GROWTH from seed to early flower, BLOOM from early flower to harvest. Most reseller orders I ship include both bottles, because the crop cycle runs through both stages and a customer who buys only the GROWTH bottle comes back for the BLOOM bottle within four to six weeks.

Pack sizes and trade availability

Pack codes and sizes from HY-GEN Product Guide, page 14. Trade pricing on application via the LaNiTex reseller registration form.

HY-GEN has been on the Australian market since the early 2000s and is carried by hydroponic retailers in every mainland state. We picked it for the reseller list because other Australian distributors have been shipping the same range for years without the formulation complaints we have seen on cheaper imports.

Feed HY-GEN nutrients into a system that runs itself. The Smart Grow Box holds the mix in a 15-hole tank and keeps the full-spectrum LED and pump on a timer — you dose the reservoir and top up the water.

Start your bench garden →

Personally tested at home on the Sunshine Coast before listing.

HY-GEN HYDRO GROWTH vs HY-GEN HYDRO BLOOM: which to use when

The two formulas are designed to run in sequence across the crop cycle. Here is how they compare across the variables that matter for purchase planning.

EC ranges are general hydroponic horticulture guidance for leafy and fruiting crops; the printed bottle label is the authoritative source for exact dilution rates and HY-GEN-specific working EC targets.

The bench-top workhorse

Put your nutrient know-how to work on a compact bench-top garden. The Smart Grow Box runs the water, feed and full-spectrum LED on a timer across 15 planting holes — you choose what to grow and when to harvest.

Start your indoor garden →

Personally tested at home on the Sunshine Coast before listing.

Want more plants from the same nutrients? The V5.2-A tower stacks up to 72 planting sites and full-spectrum LED into a 0.3 m² footprint — the same hands-off routine, scaled up.

Scale up your grow →

Personally tested at home on the Sunshine Coast before listing.

Frequently asked questions

What is HY-GEN HYDRO GROWTH TWO PART used for?

HY-GEN HYDRO GROWTH TWO PART is a vegetative-stage hydroponic nutrient set used from seedling through pre-flower. It is built around calcium nitrate (Part A) and potassium nitrate plus magnesium sulphate (Part B), with phosphates and six chelated trace elements. The manufacturer recommends use during the growth stage and until buds or fruit have started to form, at which point the grower transitions to HY-GEN HYDRO BLOOM for the flowering and fruiting phase.

What pH and EC should I run with HY-GEN HYDRO GROWTH?

The HY-GEN concentrate pH is 3.9 to 4.3 (per the manufacturer's Safety Data Sheet, April 2023). The working nutrient solution (after the concentrate is diluted into the reservoir water) is buffered by the grower to pH 5.5 to 6.5 and EC 1.2 to 2.0 mS/cm during vegetative growth, in line with general hydroponic horticulture guidance for leafy crops and herbs. Fruiting crops climb to EC 2.0 to 2.5 mS/cm by early flower. The printed product label is the authoritative source for the exact dilution rate that achieves these targets in your reservoir.

Why is HY-GEN HYDRO GROWTH split into two parts?

Calcium (in Part A) cannot be co-concentrated with sulphate or phosphate (in Part B) because the three react to form calcium sulphate and calcium phosphate, both of which precipitate as poorly soluble white sludge. Splitting the formula across two bottles keeps the calcium isolated until the moment the grower dilutes both parts into the reservoir, at which point the working concentration is too low for precipitation to occur. Every reputable two-part hydroponic nutrient on the Australian market uses the same split for the same chemical reason.

Can I use HY-GEN HYDRO GROWTH on its own without the BLOOM bottle?

Yes, for leafy greens, herbs, and any non-flowering crop you intend to harvest before bud formation. Lettuce, basil, coriander, parsley, rocket, bok choy, and microgreens are all harvested at the leafy stage and never see the flowering nutrient profile. For fruiting and flowering crops (tomatoes, capsicums, strawberries, cucumbers, ornamentals), HY-GEN HYDRO GROWTH should be paired with HY-GEN HYDRO BLOOM, with the transition occurring at first visible bud or fruit.

What pack sizes does HY-GEN HYDRO GROWTH come in, and how do I buy it as a reseller?

HY-GEN HYDRO GROWTH ships in five pack sizes: 1 L Part A + 1 L Part B kits (code HGT01, 12 per case), 5 L sets (HGT05), 20 L sets (HGT20), 200 L drums, and 1,000 L IBC containers. The 1 L and 5 L kits suit retail and hobby growers; the 20 L through 1,000 L sizes are intended for commercial NFT benches, greenhouse operators, and market gardeners. LaNiTex Hydro Garden stocks the range for Australian B2B trade customers. Apply via the reseller registration form for trade pricing and shipping out of the Kunda Park warehouse on standing pallet allocation.

How should I store HY-GEN HYDRO GROWTH, and how long does it last?

Store both concentrate bottles sealed, upright, and out of direct sunlight in a cool spot; the mineral-salt concentrate keeps a long shelf life when stored this way, and the printed bottle label carries the manufacturer's stated use-by guidance. Once you dilute Part A and Part B into the reservoir, treat that working solution as short-life -- mix only what the system needs and refresh it on the normal 7-to-14-day flush rather than storing diluted nutrient for later. Keep the bottles out of reach of children and pets, in line with the safety data sheet.

Which hydroponic nutrients should I use, and which is best?

For an Australian setup, choose by crop stage rather than by brand hype. HY-GEN HYDRO GROWTH covers seedlings, leafy greens, herbs, and the vegetative stage of fruiting crops; pair it with HY-GEN HYDRO BLOOM once buds or fruit appear. When growers search for the best hydroponic nutrients in Australia, what actually matters is a two-part set with a verified composition, reliable calcium delivery, and consistent batches — which is why we stock the HY-GEN range for resellers rather than the cheaper imports that draw the most formulation complaints. Register for trade pricing, or run it at home alongside a Digital 4-in-1 Water Quality Tester.

Are hydroponic nutrients safe?

Used as directed, yes. The HY-GEN HYDRO GROWTH concentrate is non-flammable and non-corrosive, and all eleven listed constituents appear on the Australian Inventory of Chemical Substances (per the manufacturer's Safety Data Sheet, April 2023). Produce grown on a correctly dosed reservoir is safe to eat — rinse the harvest as you would any vegetable. Handle the concentrate like any garden product: avoid skin and eye contact, do not drink it, and store the bottles sealed and out of reach of children and pets. Follow the printed safety data sheet for first-aid guidance. This is general handling information, not a substitute for the product label.

About the writer

Laszlo Bulatko is the founder of LaNiTex Hydro Garden, based on the Sunshine Coast, Queensland. LaNiTex ships from the Sunshine Coast across south-east Queensland — Brisbane orders are typically picked up or delivered the same week. He has 15 years of experience in international sales and brand development, including building and exiting LaNiTex Kft, a Hungarian fishing-tackle distribution business he sold in 2018. He relocated to Australia in 2023 and founded LaNiTex Hydro Garden in December 2024 to apply the same distribution discipline to the Australian indoor-gardening market. Every product LaNiTex stocks was personally tested once at the Sunshine Coast workshop before being added to the catalogue. Read more about Laszlo.

Sources

1. HY-GEN Holdings Pty Ltd T/AS Hydroponic Generations, Safety Data Sheet for HY-GEN HYDRO GROW A & B, issue date 23 April 2023: https://www.hy-gennutrients.com/wp-content/uploads/MSDS-HY-GEN-HYDRO-Grow-A-_-B.pdf. Composition by weight, concentrate pH, AICS listing.
2. HY-GEN Nutrients Product Guide, page 14, HY-GEN HYDRO GROWTH TWO PART: https://www.hy-gennutrients.com/wp-content/uploads/HY-GEN-Nutrients-Hydro_Growth_Two_Part.pdf. Pack-size codes, growth-stage usage, two-part vs single-part final analysis.
3. Sustainable Gardening Australia: https://www.sgaonline.org.au/. General hydroponic horticulture guidance for working pH and EC ranges.
4. NSW Department of Primary Industries, Leafy Asian vegetables and their nutrition in hydroponics (Sophie Parks): https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0007/385576/Leafy-Asian-veg-final-Low-Res.pdf. Independent government guidance on controlling nutrient solution pH and EC for hydroponic leafy vegetables.
5. LaNiTex Hydro Garden internal testing: HY-GEN HYDRO GROWTH dosed across reservoir test rigs at the Sunshine Coast workshop, continuous use since November 2024.