Hesi Boost Flowering Booster and Ripening Additive
Hesi Boost Flowering Booster and Ripening Additive
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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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Pushes the plant through the middle of flower and into ripening
Hesi Boost is the flowering additive in the Hesi range, built on amino acids, vitamins and plant extracts rather than on a heavy mineral PK. It supports the plant's metabolism through the demanding middle weeks and helps it ripen evenly at the end.
Key Benefits
- Not another PK - works on metabolism rather than adding more phosphorus you may not need
- Amino acids and vitamins - support sugar transport into the flower
- Runs alongside a PK - the two do different jobs and can be used together
- Even ripening - reduces the gap between the top and bottom of a canopy
- Any base feed - not restricted to the Hesi programme
A canopy that ripens at three different speeds
Flowers at the top of a plant finish well before the ones underneath, so harvest becomes a compromise between cutting the bottom early or letting the top go over. Supporting metabolism through the whole canopy narrows that spread.
How to Use
- Weeks 3 to 6 of flower: 2 to 3 ml per litre at every watering
- With a PK: run alongside PK 13/14 rather than instead of it
- Final fortnight: continue to the flush - it supports ripening as well as bulking
- EC: reduce the base feed slightly as Boost goes up
- Media: soil, coco and hydroponics
Technical Specifications
- Role: Flowering booster and ripening additive
- Inputs: Amino acids, vitamins and plant extracts
- Typical dose: 2 to 3 ml per litre
- Window: Weeks 3 to 6 of flower and through ripening
- Use with: Hesi PK 13/14
- Media: Soil, coco, hydroponics
| Week | Per 1 L | Per 10 L |
|---|---|---|
| Flower weeks 3 to 6 — at every watering, continuing to the flush | 2–3 ml | 20–30 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.