Soil for acid-loving plants 125 L

Compost for acid-loving plants is an acidic growing substrate with a deliberately low pH. Ordinary garden soil suits most plants, but for rhododendrons, azaleas, blueberries, heather, hydrangeas and conifers it is too neutral.

Why this matters so much: at the wrong acidity the plant cannot take up iron, even when there is plenty of it in the soil. The leaf turns yellow while the veins stay green — this is called chlorosis, and feeding will not cure it. Acidic compost keeps the pH in the right range, so iron stays available to the plant. For hydrangeas acidity has one more effect: it is what decides whether the flowers come out blue or pink.

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