• Green Planet PK Spike — 1L
  • Green Planet PK Spike phosphorus and potassium bloom booster, 1L
  • Green Planet PK Spike — 500ml
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Green Planet

Green Planet PK Spike

Green Planet PK Spike

£20.90 GBP
£20.90 GBP
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Order by 3pm Mon–Fri — we aim to post same day · FREE Express Delivery over £60 · 1–2 working days · Free Wembley pickup

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Description

A stable PK spike built to hold in solution

Green Planet PK Spike is an extremely stable, water-soluble 0-14-15 phosphorus and potassium booster, formulated to stay in solution rather than precipitating out the way cheaper PK spikes can when mixed with calcium-heavy feeds. It is the designated bloom booster in the AutoPot feed programme and works equally well dosed into any flowering line.

Because it holds its stability, PK Spike can be introduced earlier in flower and run at a consistent rate without the reservoir management headaches that come with less soluble PK additives.

Key Benefits

  • 0-14-15 NPK concentrated phosphorus and potassium spike
  • Extremely water-soluble and stable in the reservoir
  • Designated bloom booster in the AutoPot feed programme
  • Suits any flowering feed line, not just Green Planet's own
  • Reduces lockout risk compared with less soluble PK products

How to Use

  • Introduce from the second or third week of flower through to the pre-flush stage
  • Add to the reservoir alongside the base feed and other flowering boosters
  • Follow the Green Planet feed chart for exact weekly rates

Technical Specifications

  • NPK: 0-14-15
  • Format: water-soluble liquid PK booster
Feed Chart
Green Planet PK Spike · hydroponics, coco and soil
Stage Per 1 L Per 10 L
Mid flower — weeks 3, 4 and 5 1 ml 10 ml
Note — GreenPlanet publish this as 1 mL per litre of water. Begin in week 3 for short-flowering plants (65 days or less), or week 4 for longer cycles. PK Spike and Massive are alternatives — use one or the other, not both. If you use PK Spike instead of Massive, reduce your base nutrient to stay within the target EC. Hold the solution at pH 5.8 – 6.3 and 18 – 22°C. Check pH and EC after mixing.

FREE Express Delivery on orders over £60. We aim to post same day for next-working-day arrival — order by 3pm Mon–Fri. Delivery is 1–2 working days. A few harder-to-stock or large, bulky items can take a little longer — we'll tell you if that applies to your order. Heavy-item surcharges are always shown at checkout before you pay — we only ever charge what delivery costs us. Prefer to collect? Free pickup at our Wembley store.