Patchy grass isn’t always caused by drought or irrigation problems. In Santa Clara County, underground pests like gophers, moles, and voles can damage root systems and turf, leaving lawns with thinning grass, dead patches, or uneven growth.
Santa Clara County homeowners invest significant time and water into maintaining healthy, green lawns. When sections of grass suddenly begin thinning or dying despite regular irrigation, it’s natural to suspect watering issues or disease.
However, the problem may actually be occurring below the surface.
Gophers feed directly on plant roots. As they tunnel underground, they can destroy the root systems that keep grass healthy, resulting in isolated dead patches or plants that suddenly disappear.
Moles don’t eat grass, but their extensive tunnel systems can separate roots from the surrounding soil, making it harder for turf to absorb water and nutrients.
Voles feed on grasses and plant stems near the soil surface. They also create narrow runways through lawns that may become more noticeable as grass begins to thin.
Patchy grass is often accompanied by additional clues, including:
Fresh dirt mounds
Raised tunnels
Small open holes
Soft or uneven ground
Plants that wilt despite watering
Looking at the combination of symptoms can help narrow down what may be happening beneath the surface.
Many neighborhoods feature highly maintained lawns with consistent irrigation throughout the year. These landscapes provide moisture and food that can attract underground animals, particularly during California’s dry season when surrounding natural areas become less hospitable.
If patchy grass continues spreading even after adjusting irrigation or lawn care practices, underground pest activity may be contributing to the problem. Identifying the cause early can help prevent additional damage to lawns and landscaped areas.