Newmarket, Ontario (Head Office)
1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
- Mon10:00am–6:00pm
- Tue10:00am–6:00pm
- Wed10:00am–6:00pm
- Thu10:00am–6:00pm
- Fri10:00am–6:00pm
- Sat10:00am–4:00pm
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$0.00 CAD
This product may offer additional benefits beyond those listed.
1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
106 Saunders Road, Unit #2A
Barrie, ON L4N 9A8
719 Krosno Boulevard
Pickering, ON L1W 1G4
915 McLeod Avenue, Unit #4
Winnipeg, MB R2G 0Y4
This product may offer additional benefits beyond those listed.
General Hydroponics KoolBloom Dry is a dry concentrated plant food supplement and ripening formula for late flowering, designed to encourage abundant flowering and promote ripening in annuals. This highly concentrated nutrient supplement is built for growers who want a focused bloom-finishing tool that supports robust blooms and a stronger finish without turning your base nutrition into a guessing game.
KoolBloom Dry is formulated to promote intense and abundant flowering, helping push bloom expression when plants are nearing the end of the flowering cycle. General Hydroponics positions it to enhance the production of robust blooms while also boosting the production of essential oils and fragrances in many flowers and culinary and medicinal herbs. The result is a late-stage bloom supplement that supports both visual impact and finish quality, keeping the emphasis on fuller bloom development and richer aromatic character.
A compact facts layer: KoolBloom Dry carries an NPK of 2-45-28, making it a phosphorus- and potassium-forward ripening formula geared toward bloom-stage demand. The nutrient inputs are derived from ammonium phosphate, ammonium sulfate, magnesium sulfate, potassium phosphate, and potassium sulfate. This mineral-driven profile aligns with its role as a dry concentrated supplement intended to support intense flowering and a more complete ripening finish.
KoolBloom Dry fits a wide range of setups and media, including rockwool, coco, potting mix, peat lite mix, in-ground soil, and water culture. That broad media coverage makes it easy to keep a consistent flowering-and-ripening approach across hydroponic gardens, container grows, and traditional beds, while staying focused on the same goal: abundant flowering, better ripening, and stronger fragrance cues.
Plant categories listed include vegetables, herbs, fruits, flowers, and other high value crops, which makes KoolBloom Dry a practical option for mixed gardens and high-output runs alike. This is a good fit for growers who want a dry concentrated plant food supplement and highly concentrated nutrient supplement that encourages abundant flowering, facilitates ripening in annuals, and boosts production of essential oils and fragrances during late flowering.
Step-by-step mixing and feeding instructions for General Hydroponics Kool Bloom - 2.2 LB.
Fill your reservoir or watering container with clean, room-temperature water first. Shake the bottle of General Hydroponics Kool Bloom - 2.2 LB well before every use. Using the feeding schedule below, measure the recommended dose and add it directly to the water while stirring. Allow the solution to mix fully before adding any other fertilizers, additives, or supplements.
Always add nutrients to water — not the other way around. Mix thoroughly between products to ensure an even, stable nutrient solution.
Vegetative stage — Kool Bloom
Flowering stage — Kool Bloom
Warning – Important Safety Information
This product may cause mild skin irritation and eye irritation. Avoid unnecessary contact with skin, eyes, and clothing. Use only as directed.
General safety precautions
Read and follow all instructions on the product label and any accompanying documentation before use. Keep out of reach of children and pets. Do not ingest. Avoid breathing vapours, mist, or dust that may be generated during handling or use.
Wear appropriate personal protective equipment (PPE), such as protective gloves, long sleeves, long pants and closed-toe footwear. When there is a risk of splashing or airborne particles, use safety glasses or other suitable eye and face protection.
First aid – skin contact
IF ON SKIN OR HAIR: Remove contaminated clothing immediately. Rinse skin with clean water for several minutes, then wash with mild soap and water. If irritation or redness develops and persists, seek medical attention. Wash contaminated clothing before reuse.
First aid – eye contact
IF IN EYES: Rinse cautiously with clean water for several minutes, keeping eyelids open. Remove contact lenses if present and easy to do. Continue rinsing. If irritation persists, obtain medical advice.
First aid – ingestion and inhalation
IF SWALLOWED: Rinse mouth thoroughly with water. Do not induce vomiting unless instructed by a medical professional. Seek medical attention if you feel unwell.
IF INHALED: Move the person to fresh air and keep them comfortable for breathing. If coughing, breathing difficulty, dizziness or other symptoms occur, seek medical assistance.
Storage and handling
Store this product in its original closed container, in a cool, dry and well-ventilated area. Protect from extreme temperatures and direct sunlight. Keep container tightly sealed when not in use.
Avoid release to drains, natural waterways or outdoor soil. Dispose of unused product and empty containers in accordance with local regulations and the directions on the label.
Important: If medical advice is needed, keep the product label or container available. Always follow the specific instructions and safety recommendations provided by the manufacturer. This safety notice is intended as general guidance and does not replace official label directions or documentation.
| Total Nitrogen (N) | 2.0% |
|---|---|
| Available Phosphate (P2O5) | 45.0% |
| Soluble Potash (K2O) | 28.0% |
| Total Magnesium (Mg) | 1.0% |
| Sulfur (S) | 1.5% |
| Molybdenum (Mo) | 0.001% |
Ammonium phosphate is unique because it delivers phosphorus alongside ammonium nitrogen, which can slightly lower pH right at the root surface and help plants access phosphorus more efficiently. That matters because phosphorus fuels root energy and early establishment, while ammonium supports immediate growth, making this ingredient especially useful for strong starts when used in balanced amounts.
Ammonium sulfate is unique because it delivers fast ammonium nitrogen plus plant-ready sulfate sulfur in one ingredient, and it can gently acidify the root zone over time, which matters for nutrient availability. This makes it especially useful when plants are pale and slow from true nitrogen and sulfur shortage, but it also means overuse can cause salt stress or pH drift faster than many other options.
Available Phosphate (P₂O₅) supports root development, energy transfer, and early structural growth by providing a form of phosphorus that plants can absorb and use quickly.
Molybdenum is important because it helps plants convert nitrogen into usable building blocks for chlorophyll and growth, and it’s unique from many nutrients because it mainly supports enzyme-driven “nutrient use” rather than directly building plant tissue.
Soluble potash (K2O) is important because it helps plants control water use, move sugars to new growth and fruit, and build stronger, higher-quality structure under stress. It’s unique from many other nutrients because it acts more like a regulator and transport helper than a direct “building material,” so the biggest benefits show up as steadier growth, stronger stems, and better finishing instead of just bigger leaves.
Sulfur is important because plants need it to build key amino acids and proteins that drive real growth, strong structure, and efficient use of nitrogen, making it uniquely different from “look-alike” nutrients that may change leaf color without supporting the plant’s core building process.
Total magnesium is important because magnesium powers chlorophyll and energy use, helping plants stay green, turn light into growth, and use other nutrients efficiently—and it’s unique because its problems often come from nutrient balance and uptake competition, not just a simple shortage.
Total Nitrogen is important because it directly drives leafy growth, chlorophyll production, and overall growth speed, which sets the pace for the entire plant. It’s unique because the “total” number can include different nitrogen forms that behave differently in the root zone, meaning the same total amount can produce very different results depending on the nitrogen type and plant stage.
Magnesium sulfate supplies magnesium for chlorophyll and sugar movement plus sulfur for protein building, helping plants stay efficient and green during high-demand growth. It’s unique because it adds magnesium without extra nitrogen or calcium, so it corrects magnesium issues with fewer side effects when balance is the real goal.
Potassium phosphate supplies both potassium and phosphorus, supporting root energy, nutrient transport, and flowering readiness when plants are actually limited by those nutrients. It’s unique because it delivers two major nutrients in a fast-available form, so it can correct a real PK bottleneck quickly, but it also requires careful use to avoid salt stress and nutrient imbalance.
Potassium sulfate is often preferred because it supplies potassium without added chloride and also provides sulfur, which supports protein-building and efficient nutrient use, making it a cleaner, balanced option when plants are sensitive to chloride or when you want potassium without pushing extra nitrogen or phosphorus.

1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
106 Saunders Road, Unit #2A
Barrie, ON L4N 9A8
719 Krosno Boulevard
Pickering, ON L1W 1G4
915 McLeod Avenue, Unit #4
Winnipeg, MB R2G 0Y4