GH KoolBloom Dry 1kg | High-PK Bloom Booster & Ripening Powder (2-45-28)

GH KoolBloom Dry

The General Hydroponics KoolBloom Dry is the ultimate late-stage PK bloom booster and ripening agent trusted by professional growers worldwide. Engineered with a powerful 2-45-28 NPK ratio, this high-intensity dry powder delivers the precise phosphorus and potassium surge your plants need in the final weeks of flowering, triggering explosive bud swelling, flower hardening, and enhanced terpene and resin production. If you're chasing bigger yields, denser flowers, and premium-quality harvests, KoolBloom Dry is the finishing tool that delivers.

Why GH KoolBloom Dry Outperforms Other Bloom Boosters

• Massive PK Boost (2-45-28): An aggressive phosphorus and potassium spike maximises flower development, final swell, and harvest weight during the critical ripening phase.
• Superior Flower Hardening: Transforms soft, airy flowers into dense, heavy, rock-hard buds with improved structure and bag appeal.
• Enhanced Terpene & Resin Production: Boosts essential oil output for stronger aroma, flavour, and visual resin coverage at harvest.
• Precision Ripening Across the Canopy: Ensures even maturity from top to bottom, improving overall harvest consistency and quality.
• Highly Soluble & System Safe: Dissolves instantly with no residue, safe for DWC, NFT, recirculating hydroponics, coco coir, and soil without clogging lines or drippers.

Late Flowering Performance | Final Swell & Ripening

KoolBloom Dry is specifically engineered for the final 2 to 3 weeks of flowering, where yield and quality are determined. Unlike early-stage bloom nutrients, this formula delivers a targeted PK surge that forces plants to shift all available energy into flower mass, density, and resin production.

• Final Flower Swell Activation: Triggers rapid expansion of flower mass during the critical final phase of the cycle.
• Bud Hardening Technology: Increases density and structural integrity, eliminating light, airy flowers for a more professional finish.
• Resin & Terpene Spike: Enhances secondary metabolite production for stronger aroma, flavour complexity, and higher-quality crop finish.
• Even Canopy Ripening: Balances nutrient delivery to ensure uniform harvest readiness across the entire plant.

Guaranteed Analysis

• Nitrogen (N): 2.0%
• Phosphate (P₂O₅): 45.0%
• Potash (K₂O): 28.0%
• Derived from: Magnesium Phosphate, Potassium Phosphate, Potassium Sulfate

How & When to Use

• When: Final 2 to 3 weeks of the flowering stage only
• Dosage: 0.3g, 0.6g per litre (approx. ¼, ½ tsp per 4L)
• Mixing: Dissolve thoroughly into water before adding to reservoir. Use alongside base nutrients, reduce base nutrient strength to prevent overfeeding at high EC levels.
• Compatible with: Hydroponics (DWC, NFT, recirculating), coco coir, and soil

Product Details

• Size: 1kg Powder
• Type: Dry PK Bloom Booster & Ripening Agent
• Stage: Late Flowering / Ripening only

GH KoolBloom Dry is the professional-grade PK bloom booster for Australian growers who demand denser flowers, heavier harvests, and premium-quality results in the final weeks of their grow cycle.

Frequently Bought Together

• Grotek Monster Bloom, an alternative high-PK dry powder booster; compare both to find your preferred PK profile
• Rock Resinator, stack with KoolBloom Dry for maximum resin production and bud hardening in the final weeks
• Terra Aquatica Final Part, follow KoolBloom Dry with Final Part in the last 7 to 10 days for a complete ripening finish

Frequently Asked Questions

When do I start using GH KoolBloom Dry 1kg?

Start using GH KoolBloom Dry 1kg in the final 2 to 3 weeks of flowering only, once buds are actively swelling and the plant is moving into the ripening phase. It is not a base bloom nutrient and is not intended for the start of flowering or the end of veg, its heavy 2-45-28 ratio is formulated specifically to trigger final swell, hardening, and ripening in the closing weeks of the cycle. Introducing it earlier than that risks overfeeding phosphorus and potassium while the plant is still building structure rather than finishing flowers. Follow the feeding chart for your specific crop.

Can I use GH KoolBloom Dry 1kg alongside my base nutrient?

Yes, GH KoolBloom Dry 1kg is designed to complement your existing base nutrient. Add your base nutrient first, then add GH KoolBloom Dry 1kg and any other additives. Always check total EC after mixing to ensure you are not overfeeding. If EC is too high, reduce your base nutrient dose proportionally rather than reducing GH KoolBloom Dry 1kg, the booster's specialised chemistry should remain at full dose for best results.

Will GH KoolBloom Dry 1kg affect my nutrient solution's pH?

Adding GH KoolBloom Dry 1kg may shift your reservoir pH slightly. Always measure and adjust pH after adding all nutrients and additives. Target pH 5.8 to 6.2 for hydroponics and coco, 6.0 to 6.5 for soil. Use a calibrated pH meter and pH Up or pH Down solution to dial in your final reading.

Does GH KoolBloom Dry 1kg ship fast within Australia?

Yes, GH KoolBloom Dry 1kg ships from our Australian warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2 to 5 business days. WA, NT, and TAS orders typically arrive within 5 to 12 business days.