How to Fix a Patchy Lawn
Why lawns go patchy and how to fix bare patches properly by reseeding. The RHS-backed way, no chemicals, across South East London.
Why lawns go patchy and how to fix bare patches properly by reseeding. The RHS-backed way, no chemicals, across South East London.
A patchy lawn is one of those things you stop seeing until someone visits, and then it is all you can see: thin scrappy bits, bare soil showing through, that worn strip by the back door. It is the single most common lawn complaint we get across South East London, and the reassuring news is that a patchy lawn is almost always fixable, without a single chemical.
This guide covers why lawns go patchy in the first place, the RHS-backed method for repairing bare patches so they actually knit back in, and how to stop the patches returning. It is the same approach we use when we restore lawns across South East London every week.
Patches are a symptom, not the problem. Reseed without fixing the cause and the same bare spots come straight back. The Royal Horticultural Society puts it simply: lawns go tatty or patchy after heavy use or hot dry weather, and frosty or soggy winters take their toll, especially where the lawn is walked on a lot. The usual culprits:
Work out which of these is making your lawn patchy before you reseed. A spot you cannot stop walking across needs a path or a tougher seed, not just more seed. Match the fix to the cause and the repair lasts.
There is a whole shelf of products that promise to fix a patchy lawn. The honest truth is that a bare patch is bare because there is no grass there, and the only thing that fixes that is seed making contact with prepared soil. No chemical changes that.
We never use chemicals on a lawn, ever. Quite apart from the fact that they do not work here, weed and feed type products are indiscriminate, and the steady use of garden chemicals is very likely part of the wider decline in insects and the birds that feed on them. A thick, well-seeded lawn is better for your garden and the wildlife in it than anything out of a bottle.
A few isolated bare spots in an otherwise decent lawn just need patching. But if the lawn is patchy all over, spot-seeding never quite works, the repairs sit greener and thicker than the tired grass around them and it looks worse. A lawn that is patchy everywhere is telling you it is thin everywhere, and the real fix is a full scarify and overseed so the whole thing comes back evenly. Knowing which situation you are in saves you a season of disappointing patch jobs.
People scatter seed on a bare patch, it does not take, and they conclude the lawn is beyond help. It almost never is. Patch repairs fail for one reason: the seed never made proper contact with soil.
Seed thrown onto compacted ground, dead grass or thatch just sits there, dries out, or gets eaten by birds. The RHS method works because it does the unglamorous bit first: clear the debris, loosen the soil, work in a little compost, firm it level, then sow. That is the whole difference between seed that germinates and seed that washes away.
The other half is moisture. New grass has tiny roots and dies fast if it dries out once. Consistent watering for the first few weeks matters more than anything else you do. Get soil contact and moisture right and a patchy lawn knits back together surprisingly quickly.
This is the RHS-backed process we use to repair a patchy lawn so it actually knits back in. You can do it yourself, or book us to restore the whole lawn in one visit.
Run through the causes above and pin down what is making your lawn patchy: wear, drought, pets, scalping, or moss and thatch. Fixing the cause is what stops the same patches reappearing after you reseed.
Mow the lawn fairly short, then rake hard over the bare patches to pull out dead grass, moss and debris. The seed has to reach soil, not sit on a mat of dead material.
Lightly fork or rake over the soil in each patch, work in a little topsoil or garden compost, and firm it gently with your feet to a level surface. This is the step the RHS stresses and the one most people skip.
Sow grass seed at the recommended rate, roughly 15 to 25g per square metre, going over bare patches twice for thicker cover. We use Sprogs and Dogs seed, safe for children and pets and good in shade.
Cover the seed with a light sprinkling of soil or compost to hide it from birds, then water gently with a fine rose so the seed is not washed out of place.
Keep the patches consistently damp while the seed germinates, never let them dry out once, and keep feet, pets and mowers off until the new grass is established.
Mow a little higher, never scalp, feed the lawn so it stays vigorous, and overseed any thinning areas each spring or autumn. A thick lawn simply does not go patchy the way a thin one does.
Timing matters more for lawn repair than almost anything else, because it decides how hard you have to work to keep the seed alive. The RHS is clear: spring and autumn are the ideal times, when the weather is damp and cool and the lawn recovers best.
Early autumn is arguably the best window of all, warm soil from summer plus reliable rain, so the seed germinates fast with little help from you. Mid-spring is the next best, bringing the lawn back to full strength by summer.
You can repair patches in summer, but only if you are prepared to water every day without fail. One missed dry day at the wrong moment and the young seedlings are gone. If you cannot commit to that, wait for autumn.
Reseeded patches do not vanish overnight, and it helps to know what normal progress looks like so you do not give up too early.
Grass seed germinates within a few days to a couple of weeks depending on warmth. At first the new growth looks wispy and a different shade to the established lawn, which is normal. Over roughly four to six weeks, kept damp, it thickens and blends in. The repaired areas often look greener than the rest at first, simply because they are new, and that evens out as the whole lawn grows.
The only real way to fail is to let the patches dry out once during germination, or to walk and mow over them too soon. Patience for a few weeks is the entire skill. If a lawn is patchy all over rather than in a few spots, a full scarify and overseed gives a far more even result than chasing individual patches.
A few small patches in a decent lawn are a straightforward DIY job, the method above is the whole of it. The work is not hard, it just has to be done properly: real soil preparation, the right seed, and disciplined watering for a few weeks.
Where it is worth booking a pro is a lawn that is patchy all over. That needs a full scarify and even overseed, and a professional seed spreader gives consistent coverage that hand-sowing cannot match. Our all-in restoration is £249 for a regular lawn and £349 for a large one, one visit, fixed price, no quotes, and your garden guaranteed tidier than we found it.
One visit, one price, everything included. Your gardener Josh scarifies out the thatch and moss, prepares the bare areas, and overseeds the whole lawn so it comes back evenly. The same named gardener every visit, never a chemical in sight.
The RHS points to heavy use, hot dry spells, frosty or soggy winters, and being walked on a lot. Pets, scalping the mower too low, and a layer of moss and thatch choking the grass are also common. Patches keep coming back unless the cause is fixed too.
Clear the dead grass and moss, lightly loosen the soil and work in a little topsoil or compost, firm it level, then sow grass seed at about 15 to 25g per square metre, cover lightly and water with a fine rose. Keep it damp and off it until established.
A hard-wearing mix suited to your conditions. We use Sprogs and Dogs seed, which is safe for children and pets and germinates well even in the shadier conditions common across South East London gardens.
Grass seed germinates within days to a couple of weeks, and patches knit into the surrounding lawn over roughly four to six weeks if kept damp. A badly patched lawn does best with a full scarify and overseed rather than spot repairs.
Yes, and you should. A patchy lawn is a seed and soil problem, not something a chemical fixes. The repair is mechanical: prepare the ground and overseed. We never use chemicals on any lawn.
The RHS recommends spring and autumn, when the weather is damp and cool and the lawn recovers best. You can do it through summer too, but you have to be far more diligent with watering.
Our all-in lawn restoration, a full scarify and overseed in one visit, starts at £249 for a regular lawn and £349 for a large lawn, with no travel charges anywhere in South East London.
If the bare patches are mostly moss, start with our guide on how to get rid of moss in a lawn. For prices and what is included, see our lawn care prices guide.
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