Gardeners warned over 'bad idea' lawn mistake that could ruin grass this summer

Gardeners have been warned over a "bad idea" lawn mistake that experts say can leave grass damaged, patchy and slow to recover during the summer. Many homeowners reportedly still make the error during spells of hot weather without realising the long-term impact.

The warning comes after parts of the UK experienced temperatures as high as 34C during a recent mini-heatwave. The hot conditions saw many Britons head outdoors to enjoy the weather, with gardens, parks and beaches all proving popular. However, experts say the same spell of sunshine also prompted a common mistake, as some homeowners chose to mow their lawns despite the risks posed by extreme heat. Here's everything you need to know.

Gardening expert James Lewis. from MyBuilder.com, has highlighted that mowing in hot weather can expose grass blades to intense sunlight, as well as accelerate moisture loss. He warned how this can result in bare patches that take time and effort to repair once the damage has been done.

Lewis said: "While the good weather might make you feel like you have a great opportunity to make your garden look neat and tidy - actually gardening in the heat can be a bad idea." He added that high temperatures combined with strong sun can quickly weaken freshly cut grass.

"If you cut your grass, the blades will be more exposed to the sun, and the soil will also suffer," Lewis continued. "This will lead to bare patches in your lawn which will take time and effort to repair"

This advise is supported by the Royal Horticultural Society (RHS) which says keeping grass slightly longer during dry weather helps retain moisture and protect roots from heat stress. Longer grass can also help reduce evaporation at soil level.

Experts also warn that mowing during hot conditions can worsen dehydration in lawns, particularly when rainfall is limited. Research cited by the University of Reading suggests heat-stressed grass recovers more slowly when repeatedly cut too short.

Mr Lewis added that longer grass can act as a protective buffer during heatwaves, helping maintain a cooler microclimate close to the soil. He said this can improve overall lawn resilience during periods of extreme weather.

He also warned that mowing in high temperatures can pose health risks to gardeners themselves, including dehydration and heat exhaustion. The NHS advises that heat exhaustion can occur when the body overheats and struggles to regulate its temperature.

MyBuilder.com advises raising mower blade height during dry spells and avoiding cutting grass too short. It also recommends limiting heavy foot traffic on lawns and watering carefully to prevent additional stress.

The guidance also warns against watering during peak sunshine hours, when most moisture evaporates before reaching the soil. Instead, early morning or evening watering is considered most effective for lawn health.

Experts say small changes in routine can make a significant difference to lawn recovery after hot weather. With many gardens still showing signs of recent heat stress, timing and restraint are key to avoiding further damage.