Expert shares thumb hack to ensure lawn will survive winter

Grass experts have warned homeowners to make sure their grass is the correct length to help it withstand the stress of winter conditions.

Frost, reduced sunlight and the buildup of moisture can have an effect on lawns during the autumn and winter.

How to use your thumb to check if grass will withstand winter weather

Ben Agnew, grass expert at Lawnsmith, said: “It’s crucial to maintain your lawn at an optimal height before winter to help it withstand seasonal stressors like frost, reduced sunlight and moisture build-up.

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“Allowing sunlight and air to reach the grass not only reduces moisture buildup but also helps maintain healthy photosynthesis even in winter.

“We recommend 2.3 to 3 inches for most lawns to provide a protective layer and insulate roots.”

Since the average adult thumb is 2 to 2.5 inches long, according to the expert, you could use yours for reference when deciding whether your grass is long enough.

If a lawn is cut too short it could weaken its resilience to cold and fungal diseases but leaving it too long might invite mould and other winter pests.

Homeowners should avoid mowing in wet or frosty conditions (Image: Getty) Ben added: “As it’s been a mild autumn, it’s important for gardeners to bear this in mind if they do their last mows of the year this month.” 

For homeowners planning a last cut, it’s best to avoid mowing in wet or frosty conditions as this can damage both the lawnmower and the grass itself.

“Mowing in dry and mild conditions will result in a cleaner cut and a healthier lawn, giving it the best chance to survive the colder months,” Ben added.

An autumn feed is also recommended to support grass through until spring. Ben recommends a low nitrogen, high potassium fertiliser to strengthen roots while avoiding excessive top growth. 

He said: “Feeding your lawn correctly can help strengthen it for the winter chill and set a solid foundation for the spring.

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“Fertiliser prepares your lawn for the cold weather and helps strengthen the grassroots, making it more resistant to frost and disease. It also encourages healthier, denser growth in the spring.”

Make sure you remove any debris from your grass during the colder months.

Ben said: “Leaves, branches and other organic matter can block light and trap moisture on your lawn, creating the ideal conditions for mould and fungi to develop.

“Clearing your lawn regularly will allow it to breathe and help reduce winter stress."