Ionic PK Boost (PK 14/15)

Ionic PK Boost (PK 14/15) — Phosphorus & Potassium Flowering Booster

Best for: Growers looking to bulk up flowering yields during mid to late bloom without overcomplicating their feed schedule

Ionic PK Boost is a concentrated phosphorus and potassium flowering additive designed to support heavier yields and stronger bud development during the final weeks before harvest. Manufactured by Growth Technology Ltd, it delivers a balanced 14:15 PK ratio alongside iron and micronutrients — the kind of thinking you don't always get in a simple booster. Use it as a targeted push in mid to late flower, not as an everyday bottle, and it'll work across soil, coco, and hydroponics without fuss.

How it compares

Ionic PK Boost sits firmly in the premium formulated booster category.

• Balanced 14:15 ratio with added iron and micronutrients — more evolved than basic PK products
• Higher concentration than earlier Ionic formulas, so you dose weekly rather than every watering
• Designed to avoid mineral accumulation in reservoirs, which matters if you're running hydro or recycling water
• Significantly more affordable than branded premium alternatives without cutting corners on formulation

In simple terms: proper booster thinking at a sensible price.

Usage guidance

Soil and coco growers (hand-fed)
Add 1ml per litre of feed water once per week during mid to late flowering. Make up your base feed first using Ionic Bloom or any decent quality bloom nutrient, then add the PK Boost and stir in properly. Aim for an EC of 1.5 (CF 15). Adjust pH if needed.

Hydroponic growers
Mix your base nutrient as normal, then add Ionic PK Boost at 1ml per litre. Bring your EC up to 2.0 (CF 20). Change your reservoir weekly — this is when PK boosters work best.

When to start and stop
Introduce Ionic PK Boost around mid-flower when bud set is underway. Run it for 3-4 weeks, then drop it in the final week before harvest. Don't extend it or increase dosage — this is a short, sharp tool, not an everyday bottle.

Critical point
Never use Ionic PK Boost alongside other PK boosters, and never exceed the recommended rate. Overdoing phosphorus and potassium causes nutrient lockout and salt buildup faster than almost anything else. Sensible dosing works. Hammering it doesn't.

Mixing note
Never mix nutrients together in concentrate form. Add each one to your water in turn, stir properly, then add the next. This applies especially to boosters — they need space in solution to break down properly.

Technical specifications

• NPK Ratio: PK 14:15 (14% phosphorus, 15% potassium)
• Additional nutrients: Extra iron and micronutrients for enhanced firmness and flower density
• Dosage rate: 1ml per litre of feed water (weekly)
• Target EC soil/coco: 1.5 (CF 15)
• Target EC hydroponics: 2.0 (CF 20)
• Available sizes: 300ml, 1 litre, 5 litres, 20 litres
• Concentration: Highly concentrated — higher than previous Ionic Boost formula
• Compatibility: Works with soil, coco, and all hydroponic systems; use only with bloom-range base nutrients
• Manufacturer: Growth Technology Ltd (UK-based)

Who this is for

• Mid-level growers running soil, coco, or hydro who want to push yields without complexity
• Growers already using Ionic base nutrients (Bloom, Grow) who want a matched booster that actually works with the system
• Anyone running hand-fed setups where a weekly dose schedule fits naturally into feeding routine
• Hydroponic growers wanting to maximise bud weight and density without mineral salt accumulation
• Growers who've tried other PK boosters and found them too aggressive or chemically simple

Particularly well suited to anyone who values reliable, measured results over flashy promises. This is the booster for growers who understand that more doesn't equal better.

Our take

Ionic PK Boost is the kind of booster that does what it says without drama. It's properly formulated, it's made in the UK by a company that actually understands nutrient chemistry, and it sits at a price point that makes sense for everyday growers. The 14:15 ratio with added iron and micronutrients means you're getting genuine thought in the bottle, not just phosphorus and potassium thrown together.

Use it right — measured doses for a short window mid-flower — and you'll see measurable improvements in bud weight and firmness. Misuse it, and you'll learn some expensive lessons about nutrient lockout. The difference is respect for the tool and your plants.

If you're running Ionic base nutrients or looking for a booster that works across multiple systems without faffing about, worth picking up while stock lasts. Does exactly what it should, week in, week out.