Advanced Nutrients Hammerhead PK Late Flowering Booster
Advanced Nutrients Hammerhead PK Late Flowering Booster
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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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A straight PK for the second half of flower
Hammerhead is Advanced Nutrients' phosphorus and potassium booster for the back half of flowering. It is a straightforward PK rather than a blended additive, which makes it easy to slot into any feed schedule without duplicating what a base feed already provides.
Key Benefits
- Straight PK, no passengers - you are paying for phosphorus and potassium and nothing else
- Second half of flower - the window where a PK earns its place
- Low cost per litre - among the cheapest ways to add a real PK
- Any base feed - mineral or organic
- Easy to dial in - one variable rather than a blend of several
Flowers that stop gaining in the last three weeks
A base feed carries a general ratio, and in the second half of flower demand for phosphorus and potassium climbs well past it. The plant plateaus, and the difference between a good yield and an average one is usually decided right there.
How to Use
- Weeks 4 to 6 of flower: 2 ml per litre at every feed
- Heavy feeders: up to 3 ml per litre if leaf colour holds
- Taper: stop about a week before harvest and flush
- EC: reduce the base feed as the PK goes up so total EC stays on target
- Watch for: dark, clawed leaf tips mean too much - back it off
Technical Specifications
- Role: Late flowering PK booster
- Window: Weeks 4 to 6 of flower
- Typical dose: 2 to 3 ml per litre
- Formulation: Straight phosphorus and potassium
- Media: Soil, coco, hydroponics
| Stage | Per 1 L | Per 10 L |
|---|---|---|
| Flowering weeks 4 to 6 | 2 ml | 20 ml |
| Heavy feeders, if leaf colour holds | 3 ml | 30 ml |

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.