PK 9-18 5L – Phosphorus & Potassium Bloom Booster

Targeted PK Support for Heavier, Denser Flowers

PK 9-18 5L is a concentrated phosphorus (P) and potassium (K) booster formulated to support plants during the peak flowering phase, when demand for these two elements is at its highest. With a precise 9–18 PK ratio, this additive is designed to enhance flower size, density, and overall yield by supplying readily available nutrients exactly when plants need them most.

Phosphorus plays a critical role in energy transfer and flower formation, while potassium is essential for carbohydrate transport, water regulation, and structural strength within developing blooms. Used correctly, PK 9-18 helps plants maximise bud development without overloading nitrogen, making it ideal for mid-bloom supplementation.

Key Features:

• Volume: 5 Litre bottle – suitable for medium to large grow setups

• PK Ratio: 9% Phosphorus / 18% Potassium

• Mid-Bloom Focused: Designed for peak flowering weeks

• Supports Bud Weight & Density: Encourages strong, compact flowers

• Low Nitrogen Content: Prevents unwanted leafy growth during bloom

• Fast Uptake: Fully soluble and readily available to plants

• Versatile Use: Suitable for hydroponics, coco, and soil

What the Package Contains:

• 1 × 5L bottle of PK 9-18 Bloom Booster

• Secure, tamper-evident cap

• Dosage and safety information printed on the label

How to Use the Product & Best Usage Recommendations:

Dosage & Timing

• Typical application rate: 1–2 ml per litre of water

• Use during mid-flowering, usually weeks 3–6 depending on plant variety

• Apply alongside your regular bloom base nutrient

• Do not use during early flower or final flush unless specified by your feeding schedule

Application Guidelines

• Add PK 9-18 after mixing base nutrients

• Monitor EC/PPM carefully—PK boosters significantly increase nutrient strength

• Avoid combining with other high-PK additives at full strength to prevent nutrient imbalance

• Suitable for run-to-waste, recirculating systems, drip irrigation, and hand watering

Best Practice Recommendations:

• Ensure plants are healthy before introducing PK 9-18

• Reduce dosage if signs of nutrient stress appear

• Maintain stable pH levels for optimal phosphorus uptake

• Discontinue use before final ripening and flushing stage

When used correctly, PK 9-18 provides the nutritional push required during peak bloom, helping plants reach their genetic yield potential without unnecessary additives.