Grotek Carbo Max
Grotek Carbo Max
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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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Feed the root zone through every stage of bloom
Grotek Carbo Max is a concentrated carbohydrate supplement — a source of simple sugars that root-zone microbes and beneficial bacteria feed on directly, supporting a more active, healthier rhizosphere through the flowering cycle. It is not a primary nutrient; it works alongside your base feed as an energy source for the biology in the root zone rather than the plant's mineral nutrition.
Because it is added at every feed through bloom rather than as a one-off boost, Carbo Max is best thought of as a background supplement — one that supports ripening, flavour development and overall plant vitality by keeping the root-zone ecosystem well fed for the whole flowering run.
Key Benefits
- Concentrated carbohydrate source for root-zone microbial activity
- Supports ripening through the flowering cycle
- Used at every feed for consistent background support
- Compatible with all growing media
- Highly concentrated — a little covers a large feed volume
How to Use
- Dose: 100g per 380 litres of water
- Timing: add to every feed throughout bloom
- Dissolve fully before adding to the reservoir
Technical Specifications
Guaranteed analysis: Soluble Potash (K2O) 1%
Application rate: 100g/380L, every feed through bloom
Grow phase: Flowering
Compatible systems: Hydroponics, soil, soilless

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.