What causes bare patches in a lawn?
Bare patches in UK lawns have several common causes. Dog urine is one of the most frequent: the high nitrogen concentration burns the grass, leaving yellow circles with a ring of darker green around the edge. Heavy foot traffic compacts the soil, suffocating grass roots. Shade from trees, hedges, or buildings prevents photosynthesis. Fungal diseases like red thread and fusarium patch kill patches of grass in humid conditions. Scalping with a mower set too low removes the growing point and leaves bare soil. Chafer grubs and leatherjackets feed on grass roots below the surface, causing patches that pull away easily. Identifying the specific cause is the first step to an effective repair.
How to repair bare patches in your lawn
To repair bare patches, start by raking out any dead grass and debris from the affected area. Fork the soil to a depth of about 50 millimetres to relieve compaction and create a seed bed. If the soil is poor, mix in a thin layer of topsoil or lawn-grade compost. Scatter grass seed appropriate for your lawn type at the rate recommended on the packet (typically 25 to 35 grams per square metre). Lightly rake the seed into the surface, firm it with the back of a rake or by treading gently, and water thoroughly. Keep the area moist for the next two to three weeks until the grass establishes. Avoid mowing the new grass until it reaches 50 millimetres, then cut at the highest mower setting.
When is the best time to repair lawn patches?
The best time to repair bare patches is early autumn (September) or mid-spring (April to May). In autumn, the soil is warm from summer, moisture increases, and competition from weeds is lower. Spring repairs work well too but need more watering if April turns dry. Summer repairs are risky because heat and drought stress newly germinated grass. Winter repairs fail because seed will not germinate below 8 to 10 degrees Celsius soil temperature. For Cambridge lawns, ELawnCare recommends September as the primary window. Our data shows that patches overseeded in September achieve 90% coverage within four to six weeks, compared to six to eight weeks for spring sowing.