High-P/K dry soluble flower feed — zero sediment, stock-tank ready, built for commercial fertigation.
Athena Pro Bloom (0-12-24) is a fully soluble dry fertilizer formulated for the flowering phase, delivering elevated phosphorus and potassium alongside sulfate-sourced magnesium and chelated iron. Part of the Athena Pro Line two-part system — pair with Pro Core throughout flower for a complete, stackable mineral-only recipe.
Athena Pro Bloom is a zero-nitrogen, high-phosphorus and high-potassium dry soluble fertilizer designed specifically for the flowering stage of commercial cannabis and hemp production. The guaranteed analysis reads 0-12-24 — no nitrogen, 12% available phosphate (P₂O₅), 24% soluble potash (K₂O), 3% magnesium, 9% sulfur, and 0.1% chelated iron (DTPA). Potassium is sourced from potassium sulfate rather than potassium nitrate, keeping nitrogen out of the bloom recipe and delivering sulfate alongside every application.
Pro Bloom is one half of the Athena Pro Line two-part base system. It covers the P, K, Mg, S, and Fe side of the flower recipe; Pro Core (14-0-0) supplies the calcium, nitrogen, and chelated micronutrient package. Used together at the 1g Bloom : 0.6g Core ratio, the program delivers a complete, balanced nutrient profile with no additional bloom boosters required.
Pro Bloom is built for licensed cannabis and hemp operators running automated fertigation at scale — multi-light rooms, large recirculating systems, and outdoor or greenhouse operations where stock-tank preparation is the standard workflow. If your room runs Dosatron, Netaflex, Rhythm, or any similar injection system, Pro Bloom is engineered for that environment: the large-grind granule dissolves completely at room temperature, leaves no sediment in reservoirs, and will not clog drip emitters or irrigation lines.
Operators who want tight EC control without additive complexity will find the Pro Line approach straightforward: dose by weight (not volume), mix to a stock concentrate, and inject at a rate that hits your target EC. The dry format ships and stores compactly relative to equivalent liquid nutrient volume, which matters when you're buying at scale. HSC supplies Pro Bloom nationally to licensed cultivators across the US — available in 10 lb boxes for smaller facilities or in 25 lb boxes and bags for high-volume programs.
The potassium sulfate source is a deliberate formulation choice. Sulfate-form potassium delivers elemental sulfur (9% S on the guaranteed analysis) alongside potassium — sulfur is associated with secondary metabolite production including terpenes and cannabinoids, giving flower-stage sulfate feeding a dual function beyond basic macronutrient delivery.
Pro Bloom is completely free of particulates and sediment. Athena's large-grind format solubilizes fully in water at room temperature, meaning no screen filters to clear, no precipitate building up in reservoir walls, and no compatibility issues when used as directed. The formula also carries a low heavy-metal content designation — relevant for licensed operators in markets with finished-product testing that covers metals. Chelated iron (DTPA) ensures iron stays plant-available across the pH range typical in cannabis fertigation.
Mixing protocol matters: always pre-dissolve Pro Bloom and Pro Core in separate stock containers before combining into the final batch tank. Do not blend the dry powders together directly, and do not mix the two concentrates together before dilution — this prevents precipitation. Athena recommends mixing at no more than 2.5 lbs per gallon of water in the stock container.
Pro Bloom slots into the flowering weeks of the Athena Pro Feed Schedule, replacing Pro Grow as the base nutrient once the plant transitions to reproductive growth. Because the system uses a constant-EC feeding philosophy — steady EC maintained throughout the cycle, with irrigation frequency adjusted to manage substrate dry-back and nutrient availability — Pro Bloom's consistent formulation makes EC targeting predictable run over run.
For operations scaling up or streamlining a nutrient program, the Pro Line two-part dry concentrate approach consolidates what many facilities handle as five to ten separate liquid bottles into a two-component system (Bloom + Core) with optional supporting products. The dry format also means lower cost per gallon of mixed feed at volume compared to equivalent liquid programs. Contact HSC to discuss quantities, Pro Line program structure, and getting Pro Bloom scheduled into your next order.
| NPK | 0-12-24 |
| Available Phosphate (P₂O₅) | 12.0% |
| Soluble Potash (K₂O) | 24.0% |
| Magnesium (Mg) | 3.0% |
| Sulfur (S) | 9.0% |
| Iron (Fe) | 0.1% — chelated (DTPA) |
| Derived From | Monopotassium Phosphate, Potassium Sulfate, Magnesium Sulfate, Iron DTPA |
| Form | Dry soluble granule — 100% water soluble, no particulates or sediment |
| Max Stock Concentrate | 2.5 lb per 1 gallon water |
| Available Sizes | 10 lb box (two 5 lb inner bags), 25 lb box, 25 lb bag |
| Dosing Ratio (with Pro Core) | 1 g Pro Bloom : 0.6 g Pro Core |
| Compatible Dosing Systems | Dosatron, Netaflex, Rhythm, and comparable injection systems |
No — Pro Bloom must be paired with Athena Pro Core throughout the flowering stage. Pro Core supplies calcium, nitrogen, and the chelated micronutrient package (iron, manganese, copper, zinc, boron, molybdenum) that Pro Bloom does not contain. Running Bloom without Core will produce deficiencies. The standard ratio is 1 g Pro Bloom to 0.6 g Pro Core; refer to the Athena Pro Feed Schedule for week-by-week EC targets.
The flowering stage does not require the additional nitrogen that potassium nitrate would introduce. Potassium sulfate keeps nitrogen out of the bloom base while simultaneously delivering sulfur (9% S on the guaranteed analysis). Sulfur sourced as sulfate is associated with increased secondary metabolite production — terpenes and cannabinoids — making it a meaningful formulation decision for cannabis operators focused on end-product quality.
Athena discourages direct reservoir mixing for the Pro Line. The recommended approach is to pre-dissolve Pro Bloom into a stock concentrate (up to 2.5 lbs per gallon of water), then use that concentrate to dose your batch or reservoir tank via an injection system. This ensures full solubility and consistent dosing accuracy. Never combine dry Pro Bloom and dry Pro Core powders together before dissolving — mix each into its own stock container first.
No. Pro Bloom's large-grind granule is 100% water soluble and dissolves completely at room temperature. It leaves no particulates or sediment in reservoirs and will not clog drip emitters, irrigation lines, or dosing system components when used as directed.
Pro Bloom is available in a 10 lb box (containing two 5 lb inner bags), a 25 lb box, and a 25 lb bag. HSC supplies Pro Bloom nationally to licensed cannabis and hemp operators. Contact us for pricing, volume availability, and lead times on your program quantity.
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