GH KoolBloom Dry
Best bloom booster for growers seeking larger, heavier late-stage harvests.
GH KoolBloom Dry is a highly concentrated nutrient supplement designed to significantly boost flowering and aid in the ripening of annual flowers and herbs. Its specialized formula is rich in phosphorus and potassium, providing essential elements for late-stage plant development. Intended for use at the very end of a plant's life cycle, KoolBloom helps growers achieve larger, heavier fruits and flowers, enhancing the final yield and quality of their harvest. This product is sold in a case of 12 units, each weighing 2.2 lbs.
$14.48
Owner Satisfaction
4.6
/ 5
Category Rank
1939
/ 4425
#1939 in Fertilizers
Price vs Category Average
-77%
Below average
NPK Ratio
24528
/ --
Who it's for
- Quality-focused cultivators wanting to enhance harvest flavor and oil production
- Commercial growers aiming for maximum flower density and size
- Budget-conscious gardeners seeking long-lasting, cost-effective nutrient solutions
Who should skip it
- Beginners uncomfortable with frequent pH and EC monitoring
- Novice growers prone to accidental over-fertilization
- Busy gardeners wanting a quick, hassle-free mixing process
Performance breakdown
Bloom density
High phosphorus content drives significant weight and density in final harvests.
Nutrient concentration
Potent mineral-based formula requires minimal product for maximum late-stage impact.
Solubility
Water-soluble powder dissolves quickly for efficient nutrient uptake in irrigation systems.
Ripening efficiency
Accelerates the final maturation phase for consistent and high-quality yields.
Application versatility
Effective across a wide range of plants from vegetables to shrubs.
Ease of storage
Dry powder format offers a stable shelf life for long-term use.
Key Specs
NPK Ratio
2-45-28
Nitrogen
2%
Phosphorus
45%
Potassium
28%
Fertilizer Form
Water Soluble Powder
Fertilizer Source
Mineral Based
Release Type
Quick Release
Container Weight
2.2 lb
Features
- Promotes abundant flowering for bigger blooms
- Facilitates fruit and flower ripening
- Rich in phosphorus and potassium
- Builds larger, heavier fruits and flowers
- Designed for late-stage plant nutrition
- Highly concentrated formula for potent results
- Aids in ripening for enhanced yields
- Supports fruit and flower development
What customers say
Customers consistently praise GH KoolBloom Dry for its exceptional effectiveness during the crucial flowering phase. Reviewers frequently note significant improvements in flower density and overall yield, confirming its reputation as a powerful bloom booster. The primary theme centers on outstanding quality and performance. Furthermore, its highly concentrated dry formula offers superb value. Users appreciate that a small amount delivers substantial results, making it an economical choice for serious growers seeking professional grade performance without excessive cost. This product is considered an essential, high impact investment for maximizing bloom potential.
Know before you buy
This supplement is specifically designed for the final stages of plant development. You should begin using it once your plants have transitioned into the late flowering or fruiting phase to help maximize yield and ripeness.
Yes, it is formulated for a wide range of plants, including vegetables, flowers, trees, shrubs, and houseplants. Its mineral-based, water-soluble formula makes it versatile for various growing environments.
The high phosphorus and potassium content provides the specific nutrients required for heavy flower and fruit production. This ratio helps plants shift their energy away from vegetative growth and toward building larger, denser, and higher-quality yields.
GH KoolBloom Dry is a concentrated nutrient supplement, not a complete base fertilizer. It is intended to be used alongside your regular nutrient program during the final weeks of the plant's life cycle.
As a water-soluble powder, it should be dissolved thoroughly in your irrigation water according to the manufacturer's recommended dosage. Ensure it is fully mixed before applying to your plants to prevent any potential nutrient burn.
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