How to Get Rid of Moss in a Lawn
Remove moss from your lawn by treating it, scarifying, and improving drainage and light so grass can thrive.
Quick answer
Apply a moss killer, wait 7 to 14 days for it to blacken, then rake it out vigorously. Aerate the soil and overseed bare patches to stop it returning.
Moss grows where grass struggles: in shade, on compacted soil, or where drainage is poor. Killing the moss is only half the job. You must fix the underlying conditions or it will come back within months.
What you’ll need
- moss killer or lawn sand
- spring-tine rake or scarifier
- garden fork or hollow-tine aerator
- grass seed
- topsoil or compost
- watering can
Step by step
- 1
Apply moss treatment
Choose a lawn moss killer or an iron sulphate-based lawn sand. Read the packet instructions carefully. Spread it evenly on a dry day when rain is not forecast for at least 24 hours.
- 2
Wait for the moss to blacken
This takes 7 to 14 days. The moss will turn dark brown or black once it is dead. Do not rake it while it is still green or you will spread living spores across the lawn.
- 3
Scarify the lawn
Use a spring-tine rake or a powered scarifier. Pull firmly to lift the dead moss and thatch. Collect the debris with a rake or lawn sweeper so it does not smother the remaining grass.
- 4
Aerate compacted areas
Push a garden fork 10 cm into the ground every 15 cm across the lawn. Rock it gently to open air channels. For large lawns, hire a hollow-tine aerator and fill the plugs with sharp sand.
- 5
Overseed bare patches
Sprinkle grass seed evenly over thin or bare areas. Cover lightly with a thin layer of topsoil or compost. Water gently and keep the soil moist until the seed germinates, which usually takes 1 to 2 weeks.
- 6
Improve light and drainage
Cut back overhanging branches to let in sunlight. Fill shallow dips with topsoil so water does not sit on the surface. Avoid mowing the grass too short, as this weakens it and lets moss take hold.
Wear gloves when handling moss killer and wash your hands afterwards. Keep pets and children off the lawn until the product has dissolved or been watered in, as directed on the label. Do not apply more than the recommended dose or you may scorch the grass.
Common mistakes
- Raking live moss, which spreads spores to other parts of the lawn
- Applying too much moss killer and scorching the grass blades
- Overseeding before removing the moss, so seeds land on thatch instead of soil
- Mowing the lawn too short, which weakens grass and invites moss back
Frequently asked
What time of year should I treat moss?
Early spring and early autumn are best. Avoid hot, dry spells and frosty periods. These seasons give grass time to recover before stress from heat or cold.
Can I just rake moss out without chemicals?
Yes, but it is harder work and you may not remove it all. Scarifying alone works for light infestations, though repeat treatments are usually needed.
Will the grass grow back where the moss was?
Only if you overseed and improve the conditions. Moss returns quickly to bare, shady, or waterlogged soil if nothing changes.
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