When the UK experiences a spell of hot, dry weather, it's one of the questions we hear most often in our garden centre:
"Why has my lawn suddenly turned brown?"
The first thing we tell customers is not to panic.
Although a brown lawn can look alarming, it doesn't necessarily mean your grass is dead. In fact, most established lawns across the UK simply go dormant during prolonged dry weather. It's nature's way of conserving energy until cooler temperatures and rainfall return.
There are, however, several simple things you can do to help your lawn stay greener for longer and recover more quickly after a heatwave.
Why does grass turn brown in summer?
Grass is surprisingly resilient.
When the soil dries out, the roots struggle to absorb enough moisture to support new growth. Rather than continuing to grow and eventually dying, many lawn grasses effectively press the pause button.
You'll notice:
- Grass changing from green to straw-coloured
- Slower growth
- Dry, crunchy blades underfoot
- Footprints lingering on the lawn
It can look dramatic, but most healthy UK lawns bounce back remarkably well after a decent spell of rain.
Water your lawn properly (not more often)
If there's one piece of advice we'd give, it's this:
Don't water little and often.
It's tempting to give the lawn a quick spray every evening, but this actually encourages shallow roots. Grass then becomes even more dependent on regular watering.
Instead:
- Water deeply once or twice a week.
- Aim for around 25mm (1 inch) of water.
- Water early in the morning before temperatures rise.
- Avoid watering in the middle of the day, when much of it evaporates.
Deep watering encourages roots to grow further into the soil, making your lawn far more resilient during future dry spells.
Watering grass during a heatwave
If there's a hosepipe ban in place, always follow the local restrictions. Established lawns usually survive surprisingly well without watering, although newly laid turf and recently sown lawns are much more vulnerable and may need priority attention where permitted.
Don't scalp your lawn
One of the biggest mistakes people make during hot weather is mowing the lawn too short.
It seems logical... less grass should need less water... but the opposite is usually true.
Longer grass shades the soil, reducing evaporation and helping the roots stay cooler.
During summer:
- Raise your mower by one or two settings.
- Never remove more than a third of the grass height.
- Skip mowing altogether if the lawn has already turned brown.
A slightly longer lawn often stays greener for much longer.
Leave the grass clippings behind: If you're mowing regularly and only taking a small amount off, there's no need to collect every clipping. Fine clippings quickly break down and return valuable nutrients to the soil. They also help the lawn retain moisture during dry weather. This technique, often called grasscycling, is becoming increasingly popular because it's simple, free and effective.
Should you feed your lawn in summer?
Generally, no.
Applying a nitrogen-rich lawn feed during a heatwave encourages soft new growth that immediately needs more water. Unless your lawn is being watered consistently, it's usually better to wait until temperatures cool or rainfall returns. Late summer and early autumn are often much better times to feed your lawn.
Keep foot traffic to a minimum
During prolonged hot weather, dry grass is much easier to damage.
If possible:
- Move children's play equipment regularly.
- Relocate paddling pools every few days.
- Avoid repeatedly walking over the same areas.
- Change the position of garden furniture occasionally.
Small changes like these can prevent worn patches that take months to recover. Don't assume your lawn is dead. This is probably the biggest misconception we come across. Every year we meet customers who are convinced they've ruined their lawn. In reality, it's simply waiting for better conditions.
As soon as temperatures fall and rainfall returns, dormant grass usually begins producing fresh green shoots within a couple of weeks. Unless you've had exceptionally long drought conditions or your lawn was newly laid, there's every chance it will recover naturally.
How to repair a dry lawn
If your lawn has suffered during summer, autumn is the ideal time to repair it.
Start by:
- Raking out dead material.
- Aerating compacted areas.
- Overseeding thin patches.
- Applying a quality autumn lawn fertiliser.
- Watering thoroughly until new seedlings establish.
September is often considered the best month for lawn renovation in much of the UK.
Frequently Asked Questions
How often should I water my lawn in summer?
For established lawns, one or two deep watering sessions each week are usually much more effective than watering every day.
Is it OK to mow during a heatwave?
Yes, but only if necessary. Raise the cutting height and avoid mowing drought-stressed grass.
Will brown grass turn green again?
Usually, yes. Most established UK lawns recover naturally once cooler weather and rain return.
What's the best time of day to water grass?
Early morning is ideal, as less water is lost through evaporation and the grass has time to dry during the day.
Need Advice on Summer Lawn Care?
Whether you're trying to revive a tired lawn, repair dry patches or prepare for warmer weather, our knowledgeable gardening team is always happy to help.
At Old Railway Line Garden Centre, we stock everything you need for successful summer lawn care, including:
Lawn seed
Lawn fertilisers
Garden hoses
Sprinklers and irrigation equipment
Lawn spreaders
Garden tools
Water butts
If you're unsure which product is right for your garden, call in and speak to one of our experienced team members. We can recommend the best solution based on your lawn, soil type and the conditions you're experiencing.