100% soluble dry veg feed. No urea, no sediment. Built for stock-tank fertigation at scale.
Athena Pro Grow (2-8-20) is a fully soluble dry vegetative fertilizer formulated for commercial cultivators running stock-tank or inline fertigation programs. Zero urea, zero ammoniacal nitrogen, zero sediment — the nitrogen it carries is purely nitrate-form, derived from potassium nitrate, paired with potassium phosphate, potassium sulfate, magnesium sulfate, and chelated iron (DTPA) to deliver clean, predictable veg-stage nutrition.
Athena Pro Grow is the vegetative-stage component of Athena's Pro Line — a two-product-per-stage dry soluble system designed around stock-tank concentrate mixing rather than bottle-per-gallon dosing. The formula carries a 2-8-20 NPK with 3% magnesium, 8% sulfur, and 0.1% chelated iron (DTPA). Nitrogen is delivered strictly as nitrate — there is no urea and no ammoniacal nitrogen in the formulation, which keeps nitrogen uptake predictable and avoids the pH instability and ammonia-toxicity risk those forms introduce in recirculating and coco systems.
The five active ingredients — monopotassium phosphate, potassium nitrate, potassium sulfate, magnesium sulfate, and iron DTPA — are large-grind, fully water-soluble salts that dissolve completely at room temperature with no particulates or sediment. That clean solubility is what makes this formula compatible with inline dosers, drip manifolds, and recirculating systems without reservoir fouling or emitter clogging.
Pro Grow is purpose-built for licensed commercial indoor and greenhouse cannabis and hemp operations running medium-to-large fertigation volumes: multi-light flower rooms with dedicated stock tanks, vertical farms dosing via Dosatron or Netaflex, and any facility where mixing by the gallon has become a bottleneck. The 25 lb bag format is the commercial standard — the dry concentrate dramatically reduces storage footprint and per-gallon cost compared to equivalent-volume liquid programs.
It is also the correct choice for operators standardizing on Athena's constant-EC feeding methodology, where the target electrical conductivity stays steady across the vegetative cycle and irrigation frequency is the variable — not the recipe. Pro Grow's clean ingredient list makes EC dialing precise and repeatable run to run. Athena recommends mixing stock concentrates at 2 lbs per gallon (Athena's standard recommendation) and scaling dosage to hit your target EC using the published dosing chart.
Pro Grow is always run alongside Pro Core, which supplies calcium (14-0-0 NPK), micronutrients (iron EDTA, manganese EDTA, copper EDTA, zinc EDTA, boric acid, sodium molybdate), and additional nitrogen. The two products together cover the complete vegetative macronutrient and micronutrient profile. The pairing ratio is 0.6 g of Pro Core for every 1 g of Pro Grow — this ratio is weight-based, not volume-based. Athena explicitly cautions against measuring by volume and against combining the two products in dry or concentrate form; each dissolves into its own stock tank, then both are dosed into the irrigation line or reservoir separately.
Sulfate chemistry in the formula is intentional: magnesium sulfate and potassium sulfate supply the sulfur fraction (8% S total), and sulfates are associated with secondary metabolite production in cannabis, including terpene and cannabinoid synthesis. Iron DTPA provides a chelated iron source that remains plant-available across the pH range typical of fertigation programs.
The Pro Line system — Core + Grow in veg, Core + Bloom in flower — replaces 5- to 10-bottle liquid programs with two powders per stage. For a facility running multiple stock tanks and automated injection, that means fewer SKUs to reorder, simpler mixing logs, and a substantially lower cost per gallon of finished feed compared to equivalent liquid concentrates. The 25 lb bag format ships efficiently and stores without refrigeration or special handling.
For operators setting up a new fertigation system or moving off a legacy liquid program, Pro Grow is a straightforward starting point: mix stock at the published rate, dial EC using the Athena dosing chart for your target growth phase, and hold EC steady while managing irrigation frequency and dry-back. If your facility runs RO source water, Athena Pro Balance handles pH and alkalinity adjustment as an add-on to the core program. HSC supplies the full Athena Pro Line — request a quote below or reach out to discuss program pricing for your facility's volume.
| SKU | PRO-GW-25 |
| NPK Guaranteed Analysis | 2-8-20 (Total N 2.0% | P₂O₅ 8.0% | K₂O 20.0%) |
| Magnesium (Mg) | 3.0% |
| Sulfur (S) | 8.0% |
| Iron (Fe) | 0.1% chelated with DTPA |
| Nitrogen Forms | Nitrate only — no urea, no ammoniacal nitrogen |
| Derived From | Monopotassium Phosphate, Potassium Nitrate, Potassium Sulfate, Magnesium Sulfate, Iron DTPA |
| Package Size | 25 lb bag |
| Stock Tank Max Concentration | 2.5 lb per 1 gallon water (Athena recommends 2 lb/gal standard) |
| Reservoir Direct-Mix Rate | 4–6 g/gal vegetative stage; pair at 0.6 g Pro Core per 1 g Pro Grow |
| Compatible Dosing Systems | Dosatron, Netaflex, Rhythm, inline injectors; all fertigation systems |
| Sediment / Particulates | None — 100% water soluble, large-grind salt |
No. Pro Grow supplies the phosphorus, potassium, magnesium, sulfur, and iron fractions of the vegetative recipe, but it does not cover calcium or micronutrients. Athena Pro Core (14-0-0 + Ca, Fe, Mn, Cu, Zn, B, Mo) must be run alongside it. The two are mixed in separate stock tanks and dosed together — never combined dry or in concentrate form.
Nitrate-form nitrogen is the preferred nitrogen source for most recirculating and substrate-based cannabis programs because it is immediately plant-available, has a predictable uptake rate, and does not suppress calcium absorption the way ammoniacal nitrogen can. Urea requires microbial conversion before uptake and can cause localized pH swings in inert media. Athena's choice to use only nitrate nitrogen (from potassium nitrate) keeps the formula predictable across substrates — coco, rockwool, and hydro alike.
Athena recommends two separate stock tanks — one for Pro Grow, one for Pro Core. Mix each at up to 2.5 lb per gallon of water (Athena's recommended working rate is 2 lb/gal), agitate until fully dissolved. Do not combine the powders dry or mix them together in concentrate. Dose both into your irrigation line or reservoir separately at a ratio of 1 g Pro Grow to 0.6 g Pro Core, then adjust injection rate to hit your target EC. Refer to Athena's published dosing chart for EC targets by growth stage.
Yes. The large-grind salt formula is 100% water soluble with no particulates or sediment. It will not clog emitters, drip lines, or inline dosers. It is explicitly compatible with Dosatron, Netaflex, and Rhythm injection systems, and works with any other inline or reservoir-based fertigation setup.
Pro Grow is substrate-agnostic. The formula is used commercially in deep-water culture, recirculating NFT, coco coir, and perlite-based programs. Soil growers can run it as well, though the constant-EC feeding methodology Athena is built around is most precisely executed in inert or hydroponic substrates where you have direct control over irrigation and runoff EC.
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