Gardening expert Matt Adams shares a simple way to fight moss and strengthen lawns.
Early spring weak grass is vulnerable to moss, which can stunt its growth.(Image: Getty Images)
With spring officially here, lawns across the country are beginning to awaken from their winter dormancy, but gardeners are being warned to act quickly before moss takes hold. Early spring is a prime time for moss to thrive, as grass is still fragile after the harsh winter months.
Moss competes aggressively for sunlight, space and nutrients, leaving grass at risk and potentially slowing its recovery. Matt Adams, an expert from The Relentless Gardener, has shared a simple method to tackle moss while giving lawns a much-needed boost, The Mirror reports.
He said: “Iron sulphate is a widely used product on lawns. It is, of course, known for its strength in controlling or killing moss. That’s not all, though, it can also help grass with photosynthesis, meaning it will help give it a nice green colour whilst adding some much-needed nutrients into the soil.”
Iron sulphate is a mineral salt that, when mixed with water, effectively burns moss and causes it significant damage. While safe for grass in standard quantities, it draws moisture from moss and rapidly dehydrates it, a process made easier because moss is thin and lacks roots. Within days of application, lawns should appear greener and more vibrant.
Grass relies on iron to produce chlorophyll, the compound responsible for its rich green colour. Chlorophyll also allows plants to absorb sunlight for photosynthesis, meaning iron sulphate provides lawns with an energy boost that encourages thicker growth throughout spring.
Beyond killing moss, the treatment helps prevent yellowing and supports overall grass health, reducing the likelihood of moss returning later in the season. Lawns often develop moss during winter when soil becomes compacted and waterlogged after freezing conditions.
To ensure moss does not return permanently, experts recommend aerating and scarifying the lawn beforehand to improve soil drainage.
Iron sulphate is readily available at garden centres, typically sold as lawn sand, fertiliser, or in a water-soluble formula.
Adams cautions against applying iron directly to grass, as it is highly potent and must always be diluted with water, sand, or fertiliser to avoid scorching both the lawn and the moss.
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In early spring, lawn sand is generally the preferred option. It delivers nutrients safely when temperatures remain low, whereas fertilisers can cause serious damage to fragile turf.
Gardeners are advised to spread lawn sand containing iron sulphate after rainfall, allowing it to dissolve easily.
The treatment helps the grass develop a rich emerald hue while keeping moss under control throughout the spring months.
By following these steps, homeowners can enjoy a healthier, greener lawn this season while preventing moss from taking over during the crucial early growth period.
Iron sulphate offers a dual benefit, strengthening grass while tackling the unsightly moss that can dominate weak lawns.
