Green Planet PK Spike | Phosphorus & Potassium Bloom Booster | 1L, 5L, 20L

Trigger Budding. Bulk Up Flowers. Tighten Every Bud.

Green Planet PK Spike is a high-concentration phosphorus and potassium flowering supplement derived from multiple highly soluble PK sources — engineered to push your plants through the most critical phases of bloom. From initial budding through to final ripening, PK Spike delivers the two macronutrients your flowering plants demand most, exactly when they need them.

Why Growers Use PK Spike

• High-solubility phosphorus (P) — fuels photosynthesis, energy transfer, and nutrient uptake during the demanding flowering stage
• Potassium (K) for flower density — tightens loose, airy buds into dense, heavy flower clusters that weigh more at harvest
• Supports budding & bulking — encourages flower site initiation and drives the cell expansion needed for maximum bud size
• Strengthens cell walls — potassium reinforces structural integrity so stems and branches can support heavy flower loads
• Boosts immunity response — stronger cell walls create a natural barrier against pathogens and attacking pests during bloom
• Aids ripening — helps plants complete the flowering cycle efficiently for a clean, timely harvest
• Delivers up to 250 PPM boost — highly concentrated formula, adjust base nutrients accordingly
• Multiple soluble PK sources — ensures rapid absorption and consistent delivery to flower sites

How It Works

During the flowering stage, phosphorus and potassium become the two most critical macronutrients in your plant's diet — yet most base nutrients don't deliver them in high enough concentrations to support peak bloom performance. PK Spike fills that gap with a precision-formulated, high-solubility PK boost.

Phosphorus (P) is the engine of flowering. It drives photosynthesis, facilitates energy transfer (ATP production), and enables the plant to efficiently uptake and utilise the nutrients essential for bud formation and development. Without adequate phosphorus, flower sites struggle to initiate and develop to their full potential.

Potassium (K) is the architect of flower quality. It converts phosphorus into usable plant energy, reinforces cell wall structure to support heavy flowers, and — critically — tightens up loose, airy buds that are a telltale sign of potassium deficiency. The result is denser, more compact flower clusters that are visually impressive and heavier on the scales.

Together, PK Spike's dual-action formula triggers budding, drives bulking, and supports clean ripening — delivering your heaviest yields yet.

How to Use

• Add at 0.5–1 ml per litre to your nutrient reservoir
• Apply from week 2 of bloom, every 2 weeks, until 1 week before flush
• PK Spike adds up to 250 PPM at recommended rates — reduce base nutrient strength to compensate and avoid overfeeding
• Follow the PK Spike Application Rates chart for optimal results throughout the full flowering cycle

💡 Pro Tip: Combine PK Spike with Green Planet Massive Bloom Formulation and Rezin for a complete bloom stack targeting flower size, PK delivery, and resin production in one powerful program.

Available Sizes

Available in 1L, 5L, and 20L — suitable for home growers and large-scale commercial operations.