General Hydroponics KoolBloom 2-45-28 - 16lb

Concentrated Dry Bloom Finisher for the Final Flowering Weeks, 16lb

The last stretch of flowering asks more of a feeding program than the rest of the cycle, and a standard liquid base feed does not always deliver enough concentrated phosphorus and potassium to finish fruits and flowers fully. General Hydroponics KoolBloom 2-45-28 is a concentrated dry bloom supplement applied at the very end of the flowering cycle, using a phosphorus- and potassium-heavy ratio to help finish fruits and flowers on annual crops.

The 16lb size fits larger gardens and commercial-scale grows finishing many plants through the same window.

Key Features & Benefits

• 2-45-28 dry concentrate — delivers a high-phosphorus, high-potassium ratio in powder form for precise mixing.
• End-of-cycle timing — formulated specifically for the final stretch of flowering rather than the full growth cycle.
• Annual crop finishing — supports fruit and flower finishing on annual crops nearing harvest.
• Precise dry-mix dosing — dissolves into solution at a measured rate rather than requiring a large liquid volume.

Who Should Use KoolBloom

Growers finishing annual fruiting or flowering crops who want a concentrated phosphorus-potassium boost during the final weeks before harvest are the fit for dry KoolBloom. It is layered onto an existing bloom-stage program rather than used as a standalone feed.

About General Hydroponics

Founded in 1976 by Lawrence Brooke, General Hydroponics built its FloraSeries nutrient line into one of the more widely used hydroponic feeding systems before Hawthorne Gardening Company, a Scotts Miracle-Gro subsidiary, acquired the California company in 2015.

Frequently Asked Questions

When during flowering should I apply KoolBloom?

KoolBloom is applied at the very end of the flowering cycle, not throughout bloom. Adding it too early can push a phosphorus-potassium ratio the plant is not ready to use yet, so follow the label's timing guidance.

Why is KoolBloom a dry powder instead of a liquid?

The dry 2-45-28 formula allows a highly concentrated phosphorus-potassium ratio to be measured and dissolved precisely into solution. That concentration would be harder to stabilize and ship in liquid form at the same ratio.

Does KoolBloom replace my base bloom nutrients?

No, it is a finishing supplement, not a complete feeding program, so it is meant to be layered onto an existing bloom-stage base feed during the final weeks. Continue your regular base nutrients alongside it until the label's cutoff point.

What is the difference between dry KoolBloom and Liquid KoolBloom?

Dry KoolBloom (2-45-28) is a concentrated finishing powder used at the very end of flowering, while Liquid KoolBloom (0-10-10) is a liquid bulking agent applied earlier, at the start of the reproductive cycle, to support fruit and flower size. They target different points in the flowering timeline.

How do I mix dry KoolBloom into my reservoir?

Dissolve the measured amount fully into water before adding it to the rest of the nutrient solution, following the label's rate for your reservoir size. Full dissolution prevents concentrated pockets from reaching the root zone unevenly.