Right then. Let's have a look at the damage.
If your lawn currently looks like a doormat someone left on a barbecue, you're in good company. The Met Office has provisionally confirmed that summer 2026 was the hottest the UK has recorded since 1884, with 38.1°C at Kew in August, the driest July on record for England and Wales and, by mid August, drought declared across almost three quarters of England. Hosepipes went back in the shed. Grass went brown. Some of it went crunchy.
And in the background, out in the Pacific, the strongest El Niño on record is still building. Forecasters expect it to peak this winter, and the early UK signals point to a milder, wetter autumn than usual. Which, for lawns, is a strange bit of good news: the ground that spent three months baking is about to spend three months soaking.
That's your window. Autumn is when grass grows roots rather than leaves, the soil is still warm and the rain does the watering for you. Get a few things right in the next six to eight weeks and your lawn will come back better than it was in May. Leave it, and you'll be looking at moss, bare patches and a puddle where the shed path used to be.
Here's the plan.
First, work out if it's dead or just sulking
Most brown lawns aren't dead. Grass is an old hand at drought. When water runs out, it shuts down the green bits, pulls everything back into the crown and roots and waits. It can sit like that for weeks.
The test is simple. Find a brown patch, grab a handful of grass near the base and give it a gentle tug. If it holds firm and you can see any pale green or white at the crown, it's alive and will green up on its own once the rain arrives. If it lifts out like a tuft of dry carpet with no resistance and no colour anywhere, that bit has gone and you'll be reseeding it.
Do this in a few spots across the lawn. Most people find the sunniest, thinnest, most trodden areas are the ones that gave up, and the rest is just waiting for a drink.
Don't hammer it with high-nitrogen feed
Instinct says the lawn looks weak, so feed it hard. Please don't. A big hit of nitrogen in September forces soft, sappy top growth on a plant that's still recovering from heat stress, right before the light drops and disease season starts. You get a quick flush of green, then fusarium, then a lecture from us.
Autumn feeding is about roots, not leaves. That means two things.
Seaweed. Cold-pressed liquid seaweed is loaded with natural growth hormones, trace elements and the compounds grass uses to cope with stress. It nudges the plant into root building, helps it recover from the summer battering and toughens it up for frost. Apply every three to four weeks from now until the soil goes cold, usually late October or early November.
Soil Fungi. Drought and heat are brutal on the life in your soil, and the mycorrhizal fungi that plug into grass roots and fetch water and nutrients from further afield take a proper knock. Soil Fungi puts them back. Apply once this autumn, ideally straight after aerating or overseeding so the spores land near fresh roots. Warm, damp autumn soil is exactly what they want.
If you've got Rejuvenate in the shed, one light application in early September is fine while the soil is warm. After that, put it away until spring.
Hard ground? Get water back in before you do anything else
Weeks of heat turn topsoil hydrophobic. It develops a waxy coating that repels water, so the first rain of autumn runs straight off the surface and into your neighbour's drain. You'll have seen it: rain on the lawn, puddles on the path, dry dust an inch down.
If your soil is still doing that, one application of Hydrate now will break the surface tension and let the coming rain actually soak in where the roots are. It's a summer product by reputation, but the week you're reading this is when it earns its keep. Water it in, or time it just before a forecast wet day and let the sky do the work.
Rake, spike, then seed
Three jobs, in this order, on the same weekend if you can.
Scarify lightly. Not the full angry-rake-until-it's-bare treatment you'd give it in spring. Just enough to lift out the dead thatch and matted brown growth so light and water reach the crowns. If you're using a machine, set it high.
Aerate. This one matters more than usual this year. A summer of drought bakes the soil into something close to concrete, and a wet El Niño autumn on top of compacted ground means waterlogging, moss and roots that can't breathe. A garden fork pushed in every 10 to 15cm and rocked back does the job on a small lawn. A hollow tine aerator is better on anything bigger or on clay. Whichever you use, do it while the ground is moist and workable, not bone dry and not sodden.
Overseed. Rake a thin layer of topsoil or compost into the bare patches, sow a hardwearing seed mix, rake it in and firm it down with the back of the rake. Mid September to early October is the sweet spot: the soil is warm enough for fast germination and the autumn rain keeps it damp without you standing there with a watering can. Keep the seed moist if we hit a dry week, keep the dog off it and don't mow until it's about 5cm tall.
Mow higher, mow less
Raise the blades. Around 4cm through autumn is right for most lawns. Longer leaves mean more photosynthesis, deeper roots and better shading of the soil, all of which a recovering lawn needs. As growth slows through October, drop the frequency but not the height. A short scalp in autumn opens the door to moss.
Keep the blades sharp too. A blunt mower rips grass rather than cutting it, and torn leaf ends are an open invitation to disease in mild, damp weather. Which, if the forecasts are right, is most of what we're getting.
Watch for the wet-autumn problems
A strong El Niño doesn't hand the UK a guaranteed forecast, but the seasonal models are leaning towards mild and wet through November, with a wetter spell more likely as the season goes on. Two things to keep an eye on.
Leaves. Get them off the lawn as they fall. A layer of wet leaves on grass for a fortnight blocks light, holds moisture against the leaf and leaves a yellow patch underneath. Rake them, mow over them or blow them into the borders where they'll do some good.
Worm casts. Mild, wet soil means busy worms and a lawn covered in little muddy heaps. Leave them to dry and brush them off with a stiff broom before mowing. Don't squash them flat, and don't reach for anything that kills the worms. They're doing your aerating for free.
The short version
Check what's actually dead. Feed the roots with Seaweed and Soil Fungi, not the leaves with nitrogen. Get water back into hydrophobic soil with Hydrate. Scarify lightly, aerate properly, overseed the gaps by early October. Mow high, mow sharp, mow less. Keep the leaves and worm casts moving.
Do that and a wet El Niño autumn stops being a problem and starts being the best free irrigation your lawn has had all year. Your grass spent the summer in survival mode. Let's give it something to come back to.
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