Bad Patchy Grass: Why & How to Repair It
Bare patches are a symptom with a dozen causes. Diagnose yours first, then repair it properly. No chemicals, ever.
Bare patches are a symptom with a dozen causes. Diagnose yours first, then repair it properly. No chemicals, ever.
Bad, patchy, balding grass is one of the most common things we are called to across South East London, and the single biggest mistake people make is reaching for grass seed before asking why the grass died there in the first place. Reseed a patch with the cause still in place and you are back to bare soil in a month.
So this guide is deliberately a diagnosis before it is a repair. We will work through the dozen or so reasons a lawn goes bad, help you pin down which is yours, then do the repair properly so it actually holds. It is the same order we work in on tired lawns across South East London every week, and no chemicals are involved.
The Royal Horticultural Society says plainly that it is tricky to diagnose a bad lawn just by appearance, so it is best to consider which causes may apply to yours. Group them like this and read the pattern, not just the patch:
Most bad lawns are two or three of these stacked together. You do not need to be certain, just close enough to act, because the repair method changes depending on which group you are in. Guessing wrong is why so many reseeding attempts fail.
When a lawn looks rough the reflex is a box of weed-and-feed or a lawn tonic. It greens things up for a fortnight and changes nothing underneath. Worse, the RHS lists fertiliser overdose itself as a cause of dead patches, so the panic feed can be the very thing that scorched the lawn in the first place. Chemicals do not fix a bad lawn, they mask it, then often make it worse.
We never use chemical feeds or weedkillers, on any lawn, ever. Not just on principle, though a lawn is a small piece of habitat and we are not willing to poison it, but because they genuinely do not address the cause. A scorched, compacted or shaded lawn needs the cause removing and real grass establishing, not a colour top-up.
The RHS guidance on repairing lawns is refreshingly low-tech: sort the cause, prepare the ground, reseed or returf. That is exactly how we work, and it is the rest of this guide.
The phrase people use is "my lawn is dead", and it almost never is. Underneath the bald patches is nearly always soil that will grow grass again the moment the cause is removed and it is reseeded properly. Telling a genuinely finished lawn from a fixable one is the judgement call, and it is exactly what we bring to tired lawns across South East London every week.
This is the one idea that decides whether your repair lasts a season or a month. Grass seed is not a fix, it is the last step of a fix. If the patch was caused by the dog, by a scalping mower, by waterlogging or by deep shade, fresh seed dropped onto it dies the same way the old grass did, just slower.
So the order is non-negotiable: identify the cause, remove or reduce it, prepare the ground, then reseed. The reseeding is the easy bit almost anyone can do. The diagnosis and the cause-fixing are where bad lawns are actually won or lost.
The steps below follow that order exactly. Do not skip to the seeding because it is the satisfying part. The boring early steps are the ones that make the satisfying part work.
The no-chemical repair we use, in the order that actually makes it last. You can do it yourself, or book us to do the whole lawn in one visit.
Go back to the groups above and decide which fit your lawn: scorch, water, mowing and traffic, shade and bad ground, or pests and disease. The RHS says to consider which causes apply rather than judge by appearance. You only need to be close enough to act.
This is the step nearly everyone skips. Raise the mowing height, improve drainage on a wet area, cut back what is casting shade, or change where the dog goes. Reseeding before this is just feeding the same problem fresh grass.
Rake out the dead grass and debris down to soil, then lightly fork or rake the surface to break the compacted crust so new roots can actually get down into it.
Where a patch has sunk or the soil is exhausted or full of rubble, work in a little fresh topsoil or compost and firm it gently so it sits level with the lawn around it.
Sow pet and child friendly grass seed over the prepared patch, going over it twice for density, and use a shade-tolerant mix if shade was your cause. The right seed for the conditions matters as much as the seeding itself.
Keep the seeded patches consistently damp, never letting them dry out, and keep feet, pets and the mower off them until the new grass is properly established. Young grass fails from drying out more than anything else.
The step that turns a repair into a fix. A dense, well-fed, correctly mown lawn simply does not go patchy as easily. Scarifying and overseeding the whole lawn, not just the bald bits, is what stops you back here next year.
Reseeding works best in spring (March to April) and early autumn (September to October), when the soil is warm and moist enough for grass seed to germinate fast and establish before it is tested by heat or cold. Patch repair in the middle of a July drought rarely takes.
The diagnosis and the cause-fixing, though, can and should be done the moment you notice the lawn going. Spotting that a patch is dog urine, dry patch or grubs early means less to repair later. On the heavy clay across South East London, autumn repairs often establish better than spring ones because the ground holds moisture for the new seed.
As a rule, if the cause is fixed, one good repair in the right season plus thickening the whole lawn is enough. If you are repairing the same patch every year, the cause was never actually dealt with.
Be ready for this so you do not panic halfway. Properly repairing a bad lawn means raking patches back to bare soil, so for a couple of weeks it looks more damaged, not less. That is the repair working, not failing. You are clearing the dead so the living can come through.
New grass from seed is also slow to a watched eye. Germination takes a week or two, and it looks thin and wispy before it knits into real lawn over the following month or so. The temptation to give up and turf it over usually strikes right at the point it is about to turn the corner.
The honest expectation: a bad lawn, cause fixed and reseeded in the right season, looks rough for a few weeks, presentable within a couple of months, and genuinely good by the following season. The only true failure is reseeding without fixing the cause, then blaming the seed.
You can absolutely do this yourself. The reseeding mechanics are simple. The genuinely hard part is the diagnosis: correctly reading whether you are looking at dry patch or drought, red thread or feed scorch, grubs or compaction, because the wrong call sends the whole repair the wrong way. That judgement is most of what you are paying a gardener for.
If you would rather it was diagnosed and repaired properly in one go, we restore bad, patchy lawns across South East London in a single visit, the same named gardener every time, no chemicals ever, and your garden guaranteed to be tidier than we found it.
One visit, one fixed price, everything included. Your gardener Josh diagnoses the cause, repairs the patches, and overseeds the whole lawn to thicken it back up. The same named gardener every visit, never a chemical in sight.
There is rarely one reason. The RHS lists drought, dry patch, dog urine, over-feeding, scalping raised areas, spilt fuel, leatherjackets and chafer grubs, fungal diseases like red thread and fusarium, shade, waterlogging and compacted or buried builders' soil. The RHS says it is best to consider which causes may apply to your lawn rather than guess from how it looks.
Look at the pattern. Round scorched rings with green edges point to dog urine. Patches under trees or fences are shade or root-dry. Squelchy low areas are waterlogging. Yellow-pink webbing in a wet summer is red thread. Birds tearing at the turf usually means grubs underneath. The shape and location tell you more than the bare patch itself.
You can, but if the cause is still there it fails again within weeks. Seed thrown onto compacted, scorched or waterlogged ground without fixing the underlying problem is wasted. Diagnose and fix the cause first, then reseed into prepared soil.
Soak the spot well to dilute the salts, rake out the dead grass, work in a little fresh topsoil, then reseed and keep it damp. Long term, the only real prevention is changing where the dog goes or rinsing the area after, because no grass is truly urine-proof.
Almost always, yes, as long as the cause is dealt with. Even a lawn that looks beyond saving is usually thin, scorched or compacted rather than dead. Fix the cause, reseed the patches and thicken the whole lawn and it genuinely comes back, though it takes a season to settle.
Patch repair plus overseeding the whole lawn fixes the large majority of bad lawns far more cheaply than relaying turf. Full replacement is rarely necessary and we will tell you honestly if a lawn genuinely needs it rather than sell you a new one you do not need.
Our all-in lawn restoration, which clears and reseeds the bad patches and overseeds the whole lawn to thicken it, starts at £249 for a regular lawn and £349 for a large lawn, with no travel charges anywhere in South East London.
For the focused walk-through on bare and thin areas, read our how to fix a patchy lawn guide. For what a restoration costs and what is included, see our lawn care prices guide.
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