Most gardeners have trouble with moss on their lawns. It is one of the easier lawn problems to recognise because, unlike grass, moss tends to form soft, dense patches that sit across the soil surface, gradually filling bare or thinning areas where the grass has struggled to grow.
Even though your mossy lawn might look strong and healthy, if left untreated, it will smother grass and can leave your lawn patchy once winter is over. Removing lawn moss is best done in autumn, as the grass is still recovering from the heavy usage that it endured over the summer months.
To help maintain the health of your lawn and to ensure it survives through the winter, removing moss at this stage will help to prevent a bigger problem in the future. To get rid of lawn moss, the lawn experts at GreenThumb have shared a solution that “kills it quickly” and “makes lawns greener”.
What kills lawn moss?
GreenThumb claimed that iron sulphate (ferrous sulphate) is “the most effective and widely used moss killer in UK lawn care”. They explained that it “turns moss black” fast, “killing it quickly”.
Experts at LawnSmith also recommended this product, claiming that it gives a “wonderful green up” and helps “keep the grass healthy and moss-free” throughout the cooler months.
After applying it, moss should “quickly turn black and die, usually within about two hours”, though sometimes it may take several days, according to the Iron Sulphate retailer.
What is iron sulphate?
Iron sulphate consists of natural minerals that are crucial for plants, helping them produce sugars through photosynthesis using sunlight, carbon dioxide, and water. Gardening experts at Moowy claimed, “This process enhances plant strength and gives your grass that lush, deep green colour.”
When applied correctly, iron sulphate causes moss to blacken and die, making it much easier to remove by raking or scarifying. At the same time, it provides iron to the grass, helping to enhance its natural green colour and improve overall appearance.
How to use iron sulphate to kill lawn moss
Step one: Prepare the lawn
Before applying iron sulphate, mow the lawn a few days beforehand, remove leaves and debris, avoid cutting the grass extremely short, and check the weather forecast. Good preparation helps ensure even coverage.
Step two: Apply evenly
Always follow the application instructions provided. The aim is to mix 25g per litre of water and use a sprayer or watering can; one litre can treat five square metres. Apply evenly across the lawn and avoid overlapping applications. Uneven application can lead to inconsistent results.
Step three: Allow time to work
Following treatment, the moss will gradually darken, dry out, and then die. You may be concerned when the lawn starts turning black after treatment. This is completely normal and usually shows that the iron sulphate is working as intended. The lawn may temporarily look worse before it looks better.
Step four: Remove the dead moss
Once the moss has fully blackened, rake thoroughly, scarify heavily affected lawns and make sure to collect all loose debris.
Removing the dead moss improves air circulation, water absorption, seed-to-soil contact, and grass recovery. Leaving dead moss in place can slow lawn recovery.
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