When temperatures rise across London, one of the first parts of the garden to show signs of stress is often the lawn. Grass can turn yellow or brown, stop growing and appear completely dried out after several hot, rain-free days. For many homeowners, the natural reaction is to reach for the hose or sprinkler. However, during a heatwave, this may not always be the best approach.
The good news is that an established lawn is generally more resilient than it looks. According to the Royal Horticultural Society (RHS), lawns can turn brown during drought and recover when rainfall returns. The key is to avoid unnecessary watering, reduce stress on the grass and plan your garden landscaping with increasingly hot summers in mind.
For London homeowners, this raises an important question: what should you actually do with your lawn during a heatwave?
Should You Water Your Lawn During a London Heatwave?
For an established lawn, usually not.
Although brown grass can look unhealthy, it is often a natural response to drought. Established grass can enter a dormant state, slowing its growth and conserving resources until conditions improve.
The RHS specifically recommends resisting the temptation to regularly water established lawns during drought, as they can recover naturally once rainfall returns.
This is particularly relevant during periods of water scarcity or restrictions. Instead of trying to maintain a perfectly green lawn throughout a heatwave, allow the grass to become temporarily dormant.
There is an important exception: newly laid or newly seeded lawns. These require regular watering while their root systems are becoming established and are much more vulnerable to prolonged dry weather.
1. Raise Your Mower Height
One of the simplest ways to help your lawn survive hot weather is to stop cutting it so short.
Longer grass provides more shade to the soil surface, helping reduce moisture loss. It also allows the grass to develop stronger roots, making it better equipped to cope with dry conditions.
The RHS recommends raising the mower cutting height during drought and hot weather. If growth has stopped completely, it is better to stop mowing until conditions improve.
For London homeowners, this small change can make a significant difference during periods of extreme heat.
2. Don’t Try to Keep Your Lawn Perfectly Green
A traditional British lawn is often associated with lush green grass. However, maintaining this appearance during a severe heatwave can require substantial amounts of water.
Instead, consider accepting some seasonal browning.
Brown doesn’t necessarily mean dead.
When temperatures fall and rainfall returns, an established lawn can often recover naturally. The RHS notes that the underlying roots of a healthy lawn can remain alive even when the visible grass has turned brown.
This approach is also more sustainable, particularly during periods when water resources are under pressure.
3. Avoid Heavy Foot Traffic
Heat-stressed grass is more vulnerable to damage.
Try to avoid repeatedly walking across the same areas of lawn, particularly when the soil is extremely dry. Children playing, garden furniture and frequent foot traffic can all put additional stress on grass that is already struggling.
If you regularly use your garden for entertaining, consider creating dedicated outdoor areas using hard landscaping.
A professionally designed garden could combine lawn with patios, pathways, artificial grass, planting areas and decorative aggregate, reducing pressure on the natural grass while making the garden more practical.
4. Be Careful When Watering New Lawns
New lawns are different.
If you have recently laid turf or seeded a lawn, it needs sufficient moisture to establish strong roots. New grass is particularly vulnerable during a London heatwave and may require watering when conditions are dry.
The RHS recommends keeping newly established lawns sufficiently moist and using collected rainwater or grey water where appropriate.
If watering is necessary, avoid simply soaking the surface for a few seconds. Water should reach the root zone rather than remaining on top of the soil.
5. Water at the Right Time
If you do need to water grass or other garden plants during extreme heat, timing is important.
Early morning is generally the most effective time because temperatures are lower and evaporation is reduced. Evening watering can also be effective, although prolonged dampness on leaves may increase the risk of certain fungal problems.
Avoid watering during the hottest part of the day, when a significant amount of water can evaporate before it reaches the roots.
Always follow any local water restrictions or hosepipe rules that apply to your London property.
6. Let Grass Clippings Stay on the Lawn
During hot, dry conditions, leaving short grass clippings on the lawn can provide a useful natural mulch.
As they break down, the clippings can help return nutrients and reduce moisture loss from the soil.
The RHS recommends allowing suitable clippings to remain on lawns during drought, provided they are short and not left in excessive quantities.
This is a simple way to reduce waste while supporting the lawn.
7. Don’t Fertilise a Stressed Lawn
A heatwave is not the time to try to force your lawn into rapid growth.
Fertiliser encourages growth, but drought-stressed grass needs to conserve resources rather than produce lots of new leaves.
Avoid applying unnecessary lawn treatments during severe drought. Once cooler and wetter conditions return, you can assess the lawn and decide whether it needs renovation, feeding or reseeding.
8. Use Autumn to Repair Your Lawn
One of the best times to deal with a lawn damaged by a London heatwave is after the extreme weather has passed.
Autumn can be an ideal period for lawn renovation because temperatures are generally cooler and rainfall becomes more reliable.
Depending on its condition, your lawn may benefit from:
- Aeration
- Scarification
- Reseeding
- Top dressing
- Soil improvement
- Repairing bare patches
- New turf
The RHS recommends autumn as a suitable time to repair drought-affected lawns and improve their resilience for the following year.
9. Consider Whether You Actually Need a Traditional Lawn
For some London gardens, the best solution may be to reduce the size of the lawn rather than constantly trying to maintain it.
This is particularly relevant for small urban gardens, busy households and homeowners who want a lower-maintenance outdoor space.
Artificial grass can provide a consistently green surface without the regular mowing and watering associated with natural turf. It can also be combined with patios, pathways, raised flowerbeds and other landscaping features to create a practical garden layout.
Groundteam provides artificial grass installation in London, including preparation of the ground and professional finishing around features such as patios, decking and flowerbeds.
How Can Landscaping Make a London Garden More Heat-Resilient?
A lawn is only one part of a garden.
If your outdoor space regularly struggles during extreme weather, it may be worth looking at the overall landscaping rather than simply treating the grass.
Professional landscape gardening services in London can help create a garden that uses water more efficiently and remains attractive through different weather conditions.
This might include:
- Reducing unnecessary lawn areas
- Introducing drought-tolerant planting
- Improving soil quality
- Creating shaded areas
- Installing pergolas
- Using decorative aggregates
- Adding artificial grass
- Improving drainage
- Creating clearly defined patio and seating areas
The RHS also recommends measures such as improving soil, mulching planting areas, collecting rainwater and choosing plants that are better suited to hot, dry conditions.
What About London’s Heavy Rain After a Heatwave?
Interestingly, protecting your lawn from heat isn’t only about drought.
After a prolonged dry period, intense rainfall can create another problem. Hardened or compacted soil may struggle to absorb sudden rainfall, resulting in surface water and flooding.
If your London garden regularly becomes waterlogged after storms, the issue may require professional garden drainage and groundwork rather than simply more lawn maintenance.
Groundteam can incorporate drainage considerations into wider landscaping projects, helping homeowners create gardens that are better prepared for both periods of extreme heat and heavy rainfall.
Create a More Resilient London Garden with Groundteam
A heatwave doesn’t necessarily mean your lawn needs to be replaced or constantly watered. In many cases, the best approach is to allow established grass to go dormant, reduce mowing, avoid unnecessary watering and give it time to recover.
However, if you’re finding that your lawn requires constant maintenance—or if your garden struggles with both drought and flooding—it may be time to rethink the wider landscape.
Groundteam provides professional landscaping services in London, including garden design, artificial grass, lawns, pathways, patios, driveways, fencing, pergolas, groundwork and drainage.
Whether you want to restore an existing lawn or create a more low-maintenance, heat-resilient garden in London, our experienced team can help you find a practical solution tailored to your property.
Ready to rethink your London garden? Contact Groundteam to discuss your landscaping project and create an outdoor space designed to work with London’s changing weather.









