Most homeowners are cutting their grass too short — and it's one of the biggest reasons lawns struggle through summer heat. Taller grass means deeper roots, less watering, fewer weeds and an overall healthier lawn.
The good news: You don't need to obsess over the exact height. Following these simple guidelines can make a big difference in how your grass looks and grows.
Why mowing height matters
Mowing isn't just about keeping your yard neat; it directly affects how healthy your grass is. Cutting too short can stress your lawn, while letting it grow a bit taller can actually make it more resilient, especially during heat or dry spells.
Ideal grass height by type
Most UK lawns are made up of a mix of cool-season grasses, which are happiest when kept at around 4–5cm high. During hot, dry spells, letting the grass grow a little longer (around 5–7cm) helps shade the soil, retain moisture and reduce stress on the lawn.
The golden rule of mowing
When in doubt, mow at the tallest recommended height for your grass type. This becomes especially important during hot weather, drought conditions, and if your grass is growing in shade.
Why taller grass wins
Taller grass has deeper roots, so it has better access to water. It also shades the soil, which results in less water loss. Tall grass also acts as a natural weed control since it chokes out weeds.
The bottom line
You don't need a ruler (but it's okay if you want to use one), but mowing a little higher than you might expect can lead to a thicker, greener, and more drought-resistant lawn.
Combine the mowing higher strategy with the one-third rule — that is, never cut more than one-third of the grass blade at a time — and you've got a great lawn care plan with a lot less work. Now, to get your lawn watering habits in order.
Summer in the garden edit
GoodHome GoodHome Sagami Orange Charcoal Egg BBQ
Castlery Sierra Garden Sofa Set
Charlyne Mattox is the Food and Crafts director with over 20 years recipe development, recipe editing, and crafting experience. Prior to starting at Country Living in 2014, she worked in the crafts department at Martha Stewart Living and Martha Stewart Kids before attending cooking school at the Institute of Culinary Education in New York City. She was nominated for a James Beard media award while a senior editor at Real Simple magazine and authored a cookbook Cooking with Seeds.
When not in the kitchen she loves to garden, focusing on growing flowers and kitchen herbs (of course), watering her 25 house plants, and knitting scarfs or hats she will never be able to wear in the always hot and steamy Alabama.
