General Hydroponics
General Hydroponics Dry Nutrient KoolBloom
Best ripening supplement for growers seeking heavier, more abundant floral yields.
General Hydroponics KoolBloom is a potent dry nutrient supplement engineered to amplify the final growth stages of annual flowers and herbs. This formula delivers a concentrated blend of phosphorus and potassium, crucial for fostering abundant blooms and ensuring fruits and flowers achieve their maximum size and weight. Designed for use at the very end of a plant's life cycle, KoolBloom facilitates ripening and enhances overall yield, helping growers achieve robust, heavy harvests. It's an essential tool for maximizing the final impact of your crops.
$33.45
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4348
#50 in Fertilizers
Price vs Category Average
-46%
Below average
Form
Dry Nutrient
/ Dry Nutrient
Who it's for
- Versatile growers managing multiple soil and hydroponic setups
- Serious growers aiming for maximum flower density and oil production
- Budget-conscious gardeners seeking long-term storage and cost-effective nutrition
Who should skip it
- Hands-off gardeners who prefer low-maintenance reservoir management
- Novice gardeners prone to accidental over-fertilization
- Busy growers wanting the convenience of pre-mixed liquid nutrients
Performance breakdown
Bloom Density
High phosphorus content drives significant weight and density in final harvests.
Ripening Efficiency
Accelerates the final maturation phase for a more uniform crop finish.
Nutrient Concentration
Potent mineral-based formula requires very little product for maximum impact.
Ease of Application
Granular form requires careful mixing to ensure proper dissolution in water.
Yield Maximization
Specifically engineered to push plants to their absolute genetic production limit.
Formula Precision
Targeted NPK ratio provides exactly what plants need during late flowering.
Key Specs
Form
Dry Nutrient
SKU
732531
Package Weight
4 oz
Fertilizer Form
Granular
Fertilizer Source
Mineral Based
Nitrogen
2%
Phosphorus
45%
Potassium
28%
Features
- Highly concentrated flowering and ripening supplement
- Maximizes final growth stages
- Rich in phosphorus and potassium
- Promotes abundant blooms
- Facilitates fruit and flower ripening
- Ensures larger, heavier yields
- For end-of-life cycle use only
What customers say
General Hydroponics Dry KoolBloom consistently earns high marks for its remarkable effectiveness during the crucial flowering stage. Consumers frequently praise its ability to dramatically boost yields and enhance flower density, confirming its reliability as a powerful bloom additive. While users note its highly concentrated nature requires precise measurement, the exceptional results achieved with minimal product solidify its outstanding value for money. This nutrient is widely considered a staple for serious growers seeking professional grade performance without excessive cost.
Know before you buy
KoolBloom is designed specifically for the final stages of your plant's life. You should begin using it once your plants have finished their initial flowering phase and are entering the final ripening period before harvest.
KoolBloom is a dry, granular formula that is not fully water-soluble. It is intended to be applied as a top dressing or mixed into your growing medium, rather than dissolved into a liquid nutrient solution.
While it is excellent for annual flowers, it is also highly effective for fruiting vegetables. The high phosphorus and potassium content helps maximize the size and weight of your harvest for both floral and edible crops.
With a 2-45-28 NPK ratio, this is a highly concentrated mineral-based supplement. It focuses almost exclusively on phosphorus and potassium to drive late-stage ripening and weight gain, rather than providing a balanced diet for general growth.
Yes, the concentrated phosphorus and potassium are specifically formulated to support the final development of fruits and flowers. By providing these essential nutrients during the ripening phase, you can expect denser, heavier yields.
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$33