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General Hydroponics Dry KoolBloom Nutrients

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General Hydroponics KoolBloom Dry

The final weeks of flowering determine whether months of cultivation deliver premium yields or mediocre returns—yet most growers continue standard bloom formulas right through harvest instead of triggering the ripening response that maximizes essential oil production and flower density. KoolBloom Dry delivers an extreme 2-45-28 NPK ratio designed specifically for the last 1-2 weeks of flowering, forcing plants to redirect all remaining energy into ripening, resin production, and the explosive finishing that separates exceptional crops from average ones.

This isn't just another bloom booster. KoolBloom Dry provides 45% phosphate and 28% potassium in a concentrated powder that signals plants the growing season is ending—triggering the natural senescence response that channels resources into seed and flower maturation rather than vegetative growth. The minimal 2% nitrogen prevents new leaf production while the extreme P-K ratio drives the metabolic processes that produce essential oils, terpenes, and the dense, resinous flowers that command premium prices in competitive markets.

Commercial growers recognize KoolBloom Dry as the finishing product that transforms good harvests into great ones. Use it only during the final 1-2 weeks after General Hydroponics Liquid KoolBloom Nutrients has built flower mass during early to mid-bloom. The concentrated formula means small amounts deliver powerful ripening effects—excessive dosing causes nutrient burn, so precision is critical. Compatible with all base nutrients across hydroponics, coco, and soil systems—including the General Hydroponics FloraMicro Nutrients, FloraGro, and FloraBloom series—KoolBloom Dry provides the PK punch that forces plants to finish strong, producing the abundant, aromatic flowers that justify months of careful cultivation.

Features

💥
Extreme P-K Ripening Formula

2-45-28 NPK ratio triggers finishing response for maximum ripening and density

🌸
Abundant Flower Production

Encourages explosive final flower development and bulk in the last weeks

💎
Essential Oil Enhancement

Boosts terpene and resin production for improved aroma and potency

⏱️
Late-Stage Finisher

Use only in final 1-2 weeks after Liquid KoolBloom builds flower mass

⚗️
Highly Concentrated Powder

Small amounts deliver powerful results—precise dosing prevents burn

🌍
Universal System Compatible

Works with all base nutrients in hydroponics, coco, soil, and soilless systems

What's Included

  • 1x container of KoolBloom Dry (size varies by selection)

Specifications

Specification Value
Total Nitrogen (N) 2.0%
Ammoniacal Nitrogen 2.0%
Available Phosphate (P₂O₅) 45.0%
Soluble Potash (K₂O) 28.0%
Magnesium (Mg) 1.0%
Sulfur (S) 1.5%
Derived From Ammonium Phosphate, Ammonium Sulfate, Magnesium Sulfate, Potassium Phosphate, Potassium Sulfate
Form Dry Powder (Water Soluble)
Available Sizes Multiple sizes available
Compatible Crops Hemp, Cannabis, Flowers, Culinary Herbs, Medicinal Herbs, All Flowering Crops
Compatible Media Hydroponics, Coco Coir, Soil, Rockwool, Peat-lite Mix, All Growing Systems
Application Final 1-2 Weeks of Flowering (Late-Stage Ripening Only)

FAQ

When exactly should I start using KoolBloom Dry?+

Start KoolBloom Dry only during the final 1-2 weeks before harvest, after you've used General Hydroponics Liquid KoolBloom Nutrients throughout early to mid-flowering. The extreme P-K ratio triggers ripening and senescence—starting too early causes premature finishing and reduced yields. Watch your plants' maturity indicators (trichome development, pistil color) and introduce KoolBloom Dry when flowers are fully formed and you want to force final ripening and resin production.

What's the difference between Liquid KoolBloom and KoolBloom Dry?+

General Hydroponics Liquid KoolBloom Nutrients is used throughout the flowering phase to build flower mass and support bloom development. KoolBloom Dry is a late-stage finisher with an extreme 2-45-28 ratio used only in the final 1-2 weeks to trigger ripening, enhance essential oils, and force final maturation. Think of Liquid KoolBloom as the builder and KoolBloom Dry as the finisher—they work sequentially, not simultaneously.

How much KoolBloom Dry should I use per gallon?+

KoolBloom Dry is highly concentrated—typical application rates are 1/4 to 1/2 teaspoon per gallon (approximately 1.25-2.5 grams per gallon). Start at the lower end and increase cautiously based on plant response. The extreme phosphate concentration means small amounts deliver powerful effects, while excessive dosing causes nutrient burn and pH crashes. Always check the feed charts for specific recommendations based on your growing system.

Can I use KoolBloom Dry throughout flowering?+

No, KoolBloom Dry is designed exclusively for late-stage finishing. Using it throughout flowering will cause premature ripening, stunted flower development, and reduced yields. The minimal nitrogen (2%) and extreme P-K ratio trigger senescence—the natural end-of-life response where plants stop vegetative growth and channel all energy into seed/flower maturation. This is exactly what you want in the final weeks, but disastrous if started too early.

How does KoolBloom Dry enhance essential oil production?+

The extreme phosphate and potassium levels drive the metabolic pathways plants use to synthesize terpenes, resins, and essential oils during ripening. Phosphorus is critical for energy transfer (ATP) that powers these synthesis reactions, while potassium regulates enzyme activation and nutrient transport. The sulfur (1.5%) provides the building blocks for many aromatic compounds. Together, these elements force plants to maximize secondary metabolite production, especially when used alongside General Hydroponics Purpinator Nutrients for improved color and potency.

Will KoolBloom Dry lower my reservoir pH?+

Yes, the high phosphate concentration in KoolBloom Dry is acidic and will lower pH significantly. Always check and adjust pH after adding KoolBloom Dry to your nutrient solution. The pH drop is normal and expected—just factor it into your mixing routine. Dissolve KoolBloom Dry completely before checking pH, and be prepared to use less General Hydroponics Liquid pH Down Nutrients than usual since the product itself is acidic.

Can I use KoolBloom Dry with organic nutrients?+

KoolBloom Dry is a synthetic mineral salt fertilizer and is not certified organic. However, it's compatible with organic base nutrients if you're running a hybrid program where you accept some synthetic inputs. For strictly certified organic production, you'll need organic-approved bloom boosters instead. Many growers use organic nutrients throughout most of the grow but accept KoolBloom Dry's synthetic inputs for the dramatic finishing benefits in the final weeks.

Do I need to flush after using KoolBloom Dry?+

Many growers flush with plain water or a flushing solution for the final 3-7 days after using KoolBloom Dry to remove accumulated salts and encourage final ripening. However, flushing practices vary by grower preference and crop type. Monitor trichome development and plant fade rather than following rigid schedules. Some growers feed KoolBloom Dry until the final days before harvest, while others stop 3-5 days early and flush. Experiment to find what works best for your specific cultivars and quality goals.

Shipping & Returns

Order Processing & Shipping

We currently ship within the United States only. No international shipping is available at this time.

Order Processing:

  • Most orders are processed within 24-48 hours after being placed.
  • Some products may have extended processing times of 7-14 business days or more, which will be clearly indicated on the product page. If your order includes such items, you will receive an email from our team or be contacted directly to confirm the estimated shipping timeframe.

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We partner with reliable national carriers to deliver your orders. While specific delivery times can vary, here's a general timeframe for each carrier:

  • USPS: Typically delivers between 9:00 AM and 5:00 PM, Monday through Saturday.
  • FedEx: Typically delivers between 8:00 AM and 8:00 PM, Monday through Friday, with some Saturday deliveries.
  • UPS: Typically delivers between 9:00 AM and 7:00 PM, Monday through Friday, with some Saturday deliveries.

Note:

  • These are estimated delivery hours and may vary depending on your location and specific delivery circumstances.
  • For the most accurate delivery information, please refer to the tracking details provided once your order has shipped.

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Refunds & Returns

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Returns are subject to each manufacturer's return policy. Please look into the return policy of the brand prior to ordering. Learn more

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