General Hydroponics KoolBloom 2-45-28 - 16lb

Late-Bloom Ripening Booster for Flowering Plants, 16lb

General Hydroponics KoolBloom 2-45-28 is a concentrated dry bloom supplement designed to support abundant flowering and ripening in annual flowers and herbs. Applied only at the end of the plant's life cycle, it supplies a high ratio of phosphorus and potassium to help finish fruits and flowers.

This 16lb package covers larger gardens and commercial-scale grows that need a full-cycle supply of concentrated bloom nutrient.

Key Features & Benefits

• High Phosphorus & Potassium Ratio — supplies the elements plants draw on most heavily during ripening
• Concentrated Dry Formula — a little goes a long way, reducing storage space and shipping weight
• End-of-Cycle Timing — designed for use only in the final stage of flowering, not throughout the grow
• Water-Soluble — mixes cleanly into reservoirs and irrigation lines

Who Should Use KoolBloom

Growers finishing photoperiod annuals, herbs, and other short-cycle flowering crops who want a dedicated ripening-stage supplement.

About KoolBloom

General Hydroponics has manufactured plant nutrients for hydroponic and soil growers since 1976, and KoolBloom is part of its bloom-support lineup alongside MaxiBloom and Liquid KoolBloom.

Frequently Asked Questions

When during the grow cycle should I apply KoolBloom?

Apply only during the last one to two weeks before harvest, once flowers or fruits have begun to form.

Can KoolBloom be used with Liquid KoolBloom?

Yes, many growers combine the dry and liquid formulas during the finishing stage for added phosphorus and potassium.

Is KoolBloom suitable for soil gardens?

Yes, it is water-soluble and can be used in soil, soilless, and hydroponic systems.

How do I mix KoolBloom?

Dissolve the recommended amount in your reservoir or feed water; check the label for exact rates.

What size should I choose?

The 2.2lb size suits smaller home gardens, while the 16lb size fits larger or commercial operations that need a season's supply.