DutchPro Hydro/Coco Grow A+B Hard Water

Vegetative-stage hydro/coco feed for hard or ordinary tap water

Unlike soil, hydro and coco substrates don't hold any background nutrition of their own, so DutchPro's Hydro/Coco range is formulated at a higher concentration than the Soil range — enough to avoid a deficiency when the substrate can't top the plant up itself. This Hard Water version is built for ordinary UK tap water, which naturally carries calcium and magnesium, so no extra is added; if you're feeding with reverse-osmosis or very soft water (roughly under 150ppm), use Hydro/Coco Grow A+B Soft Water instead, which has an added calcium and magnesium boost built in.

The Grow half of this two-part system is balanced for the vegetative stage — building strong stems, leaves and root structure before the plant switches to flowering. Pair it with Hydro/Coco Bloom A+B Hard Water, which shifts the balance toward phosphorus and potassium for flower formation once flowering begins.