PK Spike by Green Planet
PK Spike by Green Planet
PK Spike by Green Planet
PK Spike by Green Planet
PK Spike by Green Planet
PK Spike by Green Planet

PK Spike by Green Planet — PK Bloom Booster for Dense, Heavy Flowers

GP-NUT-PKSPIKE-1L

$34.95
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  • Low stock - 3 items left
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  • Free shipping on orders over $499*

Pairs well with

PK Spike is Green Planet's mineral bloom booster — a 0-14-15 shot of phosphorus and potassium built for one job: bulking and ripening flowers through mid and late bloom. It's drawn from multiple highly soluble P and K sources, runs at just 0.5–1 mL per litre, and delivers up to a 250 ppm boost at full rate. Green Planet rate it at over 25% more P/K per mL than the next leading brand, which is why a single bottle goes a long way. Clean, sterile-system friendly, and at home in hydro, coco or soil.

Concentrated 0-14-15Heavy phosphorus and potassium exactly when flowering plants demand it — bud formation, bulking and ripening.
Tighter, Denser FlowersPotassium strengthens cell walls to support heavy flowers and firms up airy, loose bud structure.
Clean Mineral FormulaNo organics, no fillers — ideal for sterile reservoirs and recirculating systems where biology isn't wanted.
Low Dose, Low Cost Per FeedAt 0.5–1 mL/L a litre stretches across a full cycle — a favourite in commercial rooms for a reason.

Specifications

NPK: 0-14-15
Form: Liquid mineral concentrate
Application rate: 0.5–1 mL per litre
PPM boost: Up to 250 ppm at full rate
Timing: Weeks 3–7 of bloom
Frequency: Every watering
Derived from: Monopotassium phosphate, potassium acetate, citrate & metaphosphate
Suits: Hydro, coco and soil
Sizes: 1L, 5L, 20L
Brand: Green Planet Nutrients
The Grow Guys Tip
  • PK Spike adds up to 250 ppm on its own — trim your base nutrient strength on Spike weeks so your total EC stays where you want it.
  • Add it after your base nutrients are mixed in, stir well, and adjust pH last.
  • Running Massive already? Pick one or the other — doubling up on PK boosters is the fastest way to burn tips in late flower.

How to Use PK Spike

1Mix your base nutrients into the reservoir first — Dual Fuel or GP3 parts added separately, stirring between each.
2From week 3 of bloom, add PK Spike at 0.5–1 mL per litre to every watering and stir thoroughly.
3Check your EC/PPM — full rate adds up to 250 ppm, so back off base strength if your total runs hot.
4Adjust pH last, once everything is in the tank.
5Keep it in every watering through to the end of week 7, then drop it from the mix as you run toward the finish.

Pairs Well With

Frequently Asked Questions

Can I use PK Spike in hydro, coco and soil?

Yes. PK Spike is fully soluble and works in hydro, coco and soil systems. Keep an eye on EC in coco and recirculating setups, where salts accumulate faster.

Does PK Spike work with Dual Fuel and GP3?

Yes. It's designed to slot into Green Planet's Dual Fuel and GP3 feed programs, and it plays fine with other quality base nutrients too. Add it after your base is mixed.

Should I run PK Spike and Massive together?

No. Use one or the other — each delivers the full P and K your plants need in bloom. PK Spike is the clean mineral option; Massive is a mineral/organic blend. Where sterile practices are required, PK Spike replaces Massive.

Will PK Spike raise my EC?

Yes. At the full 1 mL/L rate it adds up to 250 ppm, so reduce your base nutrient strength on Spike weeks to keep total feed strength in range.

When should I start and stop PK Spike?

Start at week 3 of bloom and include PK Spike in every watering through to the end of week 7. That window covers bud set, bulking and ripening.

Select Size

Put Weight On Your Flowers

Concentrated 0-14-15 PK from Green Planet. Free shipping over $499*.

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