Key facts
- Source
- GreenThumb experts via WalesOnline
- Main advice
- Raise mower height during hot weather
- Reason
- Longer grass shades soil, reduces evaporation, protects roots
- Risk of cutting too short
- Lawn becomes 'far more vulnerable' to drying out
- Additional tips
- Mow less often, don't remove more than a third of grass height, keep blades sharp
Background
During summer heat, many lawns turn yellow or brown, causing concern among gardeners. According to the team at GreenThumb, grass naturally struggles during long periods of dry, hot weather. As temperatures rise, moisture evaporates more quickly from the soil, leaving less water available for the roots.
The experts note that during heatwaves, lawns may lose colour or turn brown, feel dry and brittle underfoot, stop growing as quickly, and become thinner or patchier in places. However, they emphasize that in many cases this does not mean the lawn is dead. Grass often goes dormant during extreme conditions to protect itself, and many lawns recover once temperatures cool and rainfall returns.
Current situation
GreenThumb specialists advise raising the mower height when cutting grass during summer. Allowing the lawn to remain slightly longer provides shade for the soil below and reduces evaporation. Trimming less during mowing also helps preserve moisture levels in warmer conditions.
If grass is repeatedly cut too short during periods of high temperatures, it can make the lawn 'far more vulnerable' to drying out. The experts explained that cutting grass too short during hot weather can place extra stress on the lawn and increase the risk of scorching. They recommend leaving the grass slightly longer than normal during summer to help shade the soil, reduce evaporation, and protect the roots from intense sunlight.
Impacts
Homeowners who adjust their mowing practices may see their lawns recover more effectively from heat stress. By raising the mower height and mowing less frequently, they can reduce water loss and protect the grass roots, potentially leading to a greener lawn once conditions improve.
The advice also includes practical steps such as not removing more than a third of the grass height in a single session, keeping mower blades sharp for a cleaner cut, and scheduling a service for the lawnmower. These measures can help maintain lawn health during dry spells and reduce the risk of permanent damage.
Future outlook
Scenario analysis: The possibilities below are not certain predictions.
If homeowners follow the recommended mowing adjustments, their lawns may recover more quickly when cooler temperatures and rainfall return. The experts suggest that grass often goes dormant during extreme conditions, so recovery is likely once the heat subsides.
However, if drought conditions persist and lawns are repeatedly cut too short, the grass could become more vulnerable to drying out and may take longer to recover. In severe cases, some patches may not regrow, requiring reseeding or other lawn care measures.
Overall, the outlook depends on weather patterns and lawn care practices. With proper mowing height and frequency, most lawns are expected to bounce back, but prolonged extreme heat could still cause lasting damage in some areas.
Source: walesonline.co.uk
