DutchPro Hydro/Coco Bloom A+B Hard Water

Flowering-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 Bloom A+B Soft Water instead, which has an added calcium and magnesium boost built in.

The Bloom half of this two-part system shifts the balance toward the phosphorus and potassium your plants need for flower formation once flowering begins. Pair it with Hydro/Coco Grow A+B Hard Water, which is balanced instead for vegetative growth earlier in the cycle.