How to Get Rid of Moss in Your Lawn
To get rid of moss in your lawn, kill it with an iron treatment, wait until it turns black (around 10 to 14 days), then rake or scarify the dead moss out. That clears what you can see, but moss returns unless you fix the cause: compacted, shaded or waterlogged soil where grass struggles and moss thrives.
Moss is one of the most common problems in UK lawns: spongy underfoot, light green and quick to take over. Before you reach for a treatment, it pays to understand why it is there, because the moss is really a symptom of the soil and growing conditions. Clear it without fixing the cause and it will be back. Here is how to get rid of moss in your lawn and keep it gone.
Why is there moss in my lawn?
Moss takes hold wherever grass is too weak to compete. The usual culprits are heavily compacted soil, shaded or sparse areas, and boggy or waterlogged ground. Notice that these are exactly the conditions grass hates: where compaction, shade or standing water stop grass establishing a deep, dense sward, bare patches open up and moss, which needs very little light and draws most of its nutrients from the air, moves straight in.
How do you get rid of moss in a lawn?
Iron (Fe) is the proven way to knock moss back. It works by drying the moss out and turning it black, usually within 10 to 14 days, after which the dead moss needs raking or scarifying out and removing from the lawn. A granular iron treatment like Iron Sward both kills the moss and greens up the surviving grass, so the lawn looks better as the moss dies off. Follow the rate on the pack, and sweep any granules off paths, patios or concrete before rain, as iron can leave orange staining on hard surfaces.
How do you stop moss coming back?
This is the part most people skip, and it is why moss keeps returning. Once the dead moss is out, fix the conditions that let it in. Relieve compaction with regular aeration and scarifying; improve boggy ground by aerating and topdressing with a sand and soil mix so water drains freely; and overseed thin or shaded patches with a shade-tolerant seed so thick grass crowds moss out. Most importantly, keep the lawn fed and dense, because a strong sward is the best moss prevention there is. A combined lawn feed, weed and moss killer keeps grass growing while staying on top of moss through the season.
Watch it in action: Mowd lawn renovation, including moss removal
MyLawn is Mowd's free DIY lawn app. It looks at your postcode's weather, the season and your lawn, then tells you the single best next thing to do, in plain English, with reminders for jobs like aerating, feeding and moss control. Take a look at MyLawn.
Related Mowd guides: How and Why to Scarify Your Lawn · Lawn Renovation: A Step-by-Step Guide · Essential Lawn Care Calendar
Not sure why the moss keeps returning? Our moss inspection guide helps you diagnose the underlying cause before you treat it.
Frequently asked questions
Why do I have moss in my lawn?
- Moss thrives where grass struggles: compacted soil, shade, and boggy or waterlogged ground. It needs little light and feeds from the air, so wherever bare or thin patches appear, moss moves in.
What kills moss in a lawn?
- Iron (ferrous sulphate) is the standard treatment. It dries the moss out and turns it black, usually in 10 to 14 days, after which you rake or scarify the dead moss out. A granular iron treatment also greens up the surrounding grass.
Should I rake moss out before or after treating it?
- After. Treat the moss first and let it blacken over 10 to 14 days, then rake or scarify it out. Raking live moss just spreads the spores around your lawn.
Will moss come back after treatment?
- It will if you do not fix the cause. After removing the dead moss, aerate to relieve compaction, improve drainage, overseed thin and shaded areas, and keep the lawn well fed so dense grass crowds moss out.