BioTabs PK 5-8
BioTabs PK 5-8
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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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An organic top-booster built for the last stretch of flower
BioTabs PK 5-8 is an organic liquid flowering accelerator with an NPK of 2-5-8, formulated around seaweed, vitamins A, B1, B2, B3 and B12, auxins and other phytohormones, plus calcium, molasses and humic acid. It's dosed from the second week of flowering right through to a week before harvest, at 1-3ml per litre with every watering, or as a heavier weekly feed of 10ml per plant, diluted in at least a litre of water, across weeks 3 to 6 of bloom.
It's built for soil and coco growers running potted or in-ground plants, and — like most organic liquid feeds with a bit of body to them — BioTabs specifically advise against running it through drip irrigation or AutoPot-style systems, since it can block fine pipework; hand watering is the recommended route, with automated watering systems switched off for 24 hours either side of application. That makes it a good fit for hand-fed soil or coco grows looking for an organic route to bigger, denser, more fragrant flowers without reaching for a synthetic PK booster.
- Purpose-built for late flower — dosed from week two of bloom through to a week before harvest.
- Loaded with bloom-support extras — seaweed, vitamins A/B1/B2/B3/B12, auxins and phytohormones alongside the core NPK.
- Organic route to bigger buds — phosphorus, potassium and calcium aimed at flower size, density and fragrance.
- Two dosing options — a steady 1-3ml/L every watering, or a heavier 10ml-per-plant feed across weeks 3-6.
- Suits soil and coco — for potted or in-ground plants, hand-watered rather than fed through driplines.
- NPK: 2-5-8 + calcium (2.5%), seaweed, molasses, humic acid, vitamins A/B1/B2/B3/B12
- Dose: 1-3ml per litre every watering (week 2 of flower to 1 week pre-harvest), or 10ml per plant in at least 1L water (weeks 3-6)
- Application: hand watering only — not recommended through drip or AutoPot systems
- Growing medium: soil, coco — potted or in-ground
| Stage | Per 1 L | Per 10 L |
|---|---|---|
| Week 2 of flower to a week before harvest, every watering | 1–3 ml | 10–30 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.