How to Repair a Patchy Lawn

Why Is Your Lawn Patchy?

Before you repair anything, work out why the patches appeared. Otherwise you'll be doing this again in six months.

Common Causes

• Wear and tear — the path between the back door and the shed, under the trampoline, where the kids play football. Heavy foot traffic kills grass in concentrated areas
• Dog urine — causes distinctive circular brown patches surrounded by a ring of darker green growth. See our guide to lawns and dogs for prevention strategies
• Shade — grass under trees or next to north-facing walls gradually thins and dies. See our shade guide
• Drought — areas of thin or sandy soil dry out first, creating brown patches in summer
• Disease — fungal problems like red thread or fusarium patch cause discoloured, dying areas. These are more common in autumn on underfed lawns
• Scalping — mowing too low on bumps or uneven ground strips the grass down to bare soil. Our lawn levelling guide covers how to fix the underlying unevenness
• Waterlogging — persistently wet areas drown grass roots. See our waterlogged lawn guide
• Chemical spill — petrol from mowers, over-application of fertiliser, or weedkiller drift

Method 1: Overseeding Bare Patches

Best for small to medium patches (up to about 30cm across) where the surrounding grass is healthy.

What You'll Need

• Grass seed (match the existing lawn — ryegrass for hardwearing lawns, fescue for finer lawns)
• A hand fork or rake
• Top-dressing mix (loam, sand, compost)
• Watering can or hose with a fine rose

Steps

1. Rake out dead grass and debris from the patch. Clear it right back to bare soil
2. Loosen the soil with a hand fork to a depth of about 25mm. Compacted, smooth soil won't let seed germinate well
3. Sprinkle seed at the rate shown on the packet (typically 35–50g per square metre). Don't overdo it — too much seed means the seedlings compete with each other and all grow weakly
4. Cover with a thin layer of top-dressing — just enough to barely cover the seed. This holds moisture and protects against birds
5. Firm gently with the back of a rake or your foot
6. Water with a fine rose and keep the patch damp for 2–3 weeks. Don't flood it — gentle, frequent watering is better

Seedlings should appear within 7–14 days depending on temperature. Don't mow the new grass until it reaches about 50mm, then set the mower high and just take the tips off.

For a full walkthrough of the overseeding process, including lawn-wide overseeding for generally thin grass, see our overseeding guide.

Method 2: Patch Repair with Turf

Best for larger patches (bigger than 30cm), areas that need to look good quickly, or spots where the soil is too poor for seed to establish.

Steps

1. Cut a neat square or rectangle around the damaged area using a half-moon edger or sharp spade. Cut slightly larger than the patch itself — clean edges are easier to work with than ragged ones
2. Remove the old turf and the top 25mm of soil beneath it
3. Fork over the exposed soil and add a thin layer of fresh topsoil if needed. Firm and level it so the new turf will sit flush with the surrounding lawn
4. Cut a piece of new turf to fit the hole exactly. It's better to cut slightly oversize and trim to fit than to leave gaps
5. Press the new turf firmly into place and fill any edge gaps with a sandy top-dressing mix. For more on dealing with gaps between turf pieces, see our gap repair guide
6. Water thoroughly and keep watering for 2–3 weeks until the new piece has rooted in

The join lines will be visible for a few weeks but will disappear as the grass grows together.

When to Repair

Spring (April–May): soil is warming up, rain is usually reliable, and grass is entering its fastest growth period. Ideal for both seed and turf patches.

Early autumn (September): still warm enough for germination, the summer stress is over, and autumn moisture helps establishment. This is actually the single best time for overseeding.

Avoid summer: too hot and dry for reliable germination unless you can water religiously. New turf can work in summer but needs heavy watering.

Avoid winter: seed won't germinate in cold soil, and turf lays poorly on frozen or waterlogged ground. See our winter turfing guide for what is and isn't possible.

Preventing Future Patches

• Feed regularly — a well-nourished lawn grows densely and recovers from wear faster. See our fertiliser guide
• Mow at the right height — never remove more than one third of the grass blade length in a single mow
• Aerate compacted areas annually to keep soil healthy
• Redirect foot traffic with stepping stones or a path through the worst-affected areas
• Water during drought — even established lawns need a good soak once a week during prolonged dry spells
• Overseed the whole lawn every autumn to thicken the grass sward and fill in thin areas before they become bare patches