Green Planet PK Spike — 1Ltr

Green Planet PK Spike — 1Ltr

PK Spike is Green Planet's concentrated phosphorus-potassium booster — delivers a sharp PK hit during the critical 2-3 week window of peak flowering when bud development is at its most intense. Where base nutrients provide steady-state PK throughout bloom, PK Spike adds the extra push that drives maximum bud size and density during the transition from flower formation to flower fattening. Use for 2-3 weeks during mid-flower, then stop and let your base nutrient and finishing additives carry through to harvest.

Why growers choose PK Spike:

• Concentrated PK formula — sharp phosphorus-potassium boost at peak bloom
• Targeted application window — 2-3 weeks during mid-flower for maximum effect
• Drives bud size and density — the PK push that makes the difference
• Compatible with any base nutrient — brand-agnostic PK booster
• Available in 1L and 4L — accessible sizing for home growers

Who it's not for:

PK Spike is a short-duration mid-flower booster — don't run it for the entire bloom phase or you'll create nutrient toxicity. Start when buds are forming visibly (usually week 3-4 of flower), run for 2-3 weeks, then stop. For ongoing bloom feeding, your base nutrient handles that. PK Spike stacks with Bud Booster (different nutrient profile) but watch EC carefully when combining multiple flowering additives. For comparison: similar role to Canna PK 13/14, H&G PK 13/14, or Shogun PK Warrior 9/18.

In stock now — ships same working day from our Staffordshire warehouse with free UK delivery over £100. Pick up in-store at our Stone shop (ST15 0SR) if you're local, or click & collect at checkout.