As winter recedes, many British lawns are left yellow, patchy, and spongy. Gardening experts say early spring is the critical time to apply a key mineral—iron sulphate—to prevent moss takeover and promote thick, healthy grass.
Geoff Hodge, writing on the Richard Jackson Garden website, emphasises that feeding is essential. Regular mowing depletes nutrients, and a good lawn feed replaces them, making grass thicker, stronger, and better able to resist moss, weeds, and drought stress.
Liquid lawn treatments are recommended for immediate results with less risk of scorching than granular products. For professional-grade outcomes, Hodge suggests choosing a product containing iron sulphate, which simultaneously controls moss and boosts grass colour.
Iron sulphate works by blackening moss while supplying grass with extra iron for greener growth. It aids photosynthesis and enriches soil nutrients. However, it must be diluted in sand, fertiliser, or water—never applied pure.
