General Hydroponics FloraPro Liquid PK+, 6 Gallon

PK+ is a zero-nitrogen Phosphorus, Potassium, and Sulfur supplement used to bulk and ripen crops. The benefit of PK+ is realized at the system level: by transitioning application rates away from the Bloom base and toward PK+ in flower, you effectively remove Nitrogen delivery while keeping P, K, and S in the target range for critical flower formation and bulking. This shift facilitates a Nitrogen-tapering signal to amplify senescence and color change.

What It Does

FloraPro PK+ (0-4-6) is a zero-nitrogen formula designed to help bulk and ripen plants by supplementing Phosphorus, Potassium, and Sulfur levels through flowering and finish. This boost is designed to regulate the on-set signal of senescence, which allows the plant to shift energy from leaf growth toward ripening.

How To Use It

This product is intended for use in continuous liquid feed programs for hydroponic use only. Normal feeding range is up to 10 mL/gal, depending on the growth stage. Consult FloraPro feed programs for additional information.

Application rates (in mL per gallon) based on the FloraPro Liquid Feed Program:

• Early Flower (Weeks 1-3): 2 mL
• Mid Flower (Weeks 4-6): 4 mL
• Late Flower (Weeks 7-8): 5 mL
• Finish (Week 9): 7 mL

Note: Adjustments may be needed based upon environmental conditions, water quality, individual grow structure and use of additional products. Feed programs are recommendations and a starting point, actual results may vary.

Why It Matters

By transitioning application rates away from the Bloom base and toward PK+ during the flowering stage, you reduce Nitrogen delivery. This shift maintains Phosphorus (P), Potassium (K), and Sulfur (S) within the target range required for critical flower formation and bulking. This precision steering triggers natural senescence signals, facilitating a clean finish and heavy generative weight without the interference of excess Nitrogen.

How To Use This Product

Zero-Nitrogen Flower Support

FloraPro PK+ delivers phosphorus, potassium, and sulfur without adding nitrogen. This makes it a useful tool for supporting flower development while the FloraPro Liquid Program tapers nitrogen through late flower and finish.

Supports Bulking and Ripening

PK+ is used throughout flowering to support the generative phase. Application rates increase as the crop moves from early flower into mid flower, late flower, and finish, helping support flower formation and ripening.

Works with Bloom A & B

PK+ is designed to work with FloraPro Bloom A and Bloom B. As Bloom base rates decrease, PK+ helps maintain P, K, and S delivery so the program can continue supporting flower formation, bulking, ripening, and finish quality.