A healthy green lawn is something many homeowners work hard to maintain, so it’s frustrating when brown patches suddenly appear. Sometimes the problem is as simple as watering too much or too little. Other times, insects, disease, or everyday lawn care habits are to blame.
The sooner you figure out what’s causing the damage, the easier it is to stop it from spreading and get your grass looking healthy again. Here are 10 common reasons lawns develop brown spots and what you can do to fix them.
Overwatering
Grass needs water to stay healthy, but too much of it can cause problems. When the soil stays soaked for long periods, the roots struggle to get enough oxygen, and fungal diseases become more likely.
Most lawns need about 1 to 1½ inches of water each week. Watering two or three times a week instead of every day gives the soil time to dry slightly between watering sessions.
Related: 17 Things Lawn Experts Wish Homeowners Would Stop Doing
Underwatering
Brown patches often appear during hot, dry weather if your lawn isn’t getting enough moisture.
Rather than watering lightly every day, give your lawn a deep soaking so the moisture reaches several inches below the surface. Deep watering encourages stronger roots that can better handle dry conditions.
Pest Damage
Several insects feed on grass roots or blades, leaving brown patches behind. Grubs, chinch bugs, and armyworms are among the most common culprits.
If you notice thinning grass, loose patches that lift easily, or signs of insects, inspect the area closely. Depending on the pest, treatment may include insecticides or natural controls such as beneficial nematodes.
Related: 13 Reasons Skunks Are Secretly Beneficial to Your Lawn
Dog Urine
Dog urine contains high levels of nitrogen, which can burn grass if it’s concentrated in one spot. These patches often have a ring of darker green grass around the outside where the nitrogen acts like fertilizer.
One of the easiest ways to reduce the damage is to water the area soon after your dog urinates. The extra water helps dilute the nitrogen before it can scorch the grass.
Dull Mower Blades
A mower with dull blades doesn’t cut grass cleanly. Instead, it tears the blades, leaving ragged edges that quickly turn brown.
Sharpening your mower blades once or twice each year, or more often if you mow frequently, helps produce cleaner cuts and keeps your lawn looking greener.
Related: 10 Ways Your Perfect Lawn Is Actually Destroying Your Home’s Foundation
Lawn Fungus
Fungal diseases are another common cause of brown spots, especially during warm, humid weather.
Problems such as brown patch, dollar spot, and rust spread more easily when grass stays wet for long periods. Watering early in the morning allows the lawn to dry during the day, and fungicides may help if the infection becomes widespread.
Thatch Buildup
A thin layer of thatch is normal, but too much can block water, nutrients, and air from reaching the roots.
If your lawn has a thick layer of dead grass and organic material between the soil and the grass blades, removing it with a dethatching rake or power dethatcher can help restore healthy growth.
Compacted Soil
Heavy foot traffic, lawn equipment, and repeated mowing can pack the soil tightly over time.
Compacted soil makes it difficult for roots to get the air, water, and nutrients they need. Aerating the lawn once a year, especially in heavily used areas, loosens the soil and helps roots grow more freely.
Heat Stress
Grass often struggles during long stretches of hot weather, particularly if rainfall is scarce.
Watering early in the morning gives the lawn time to absorb moisture before the day’s heat arrives. Keeping mower blades set a little higher during summer also helps shade the soil and reduce moisture loss.
Fertilizer Burn
Applying more fertilizer than your lawn needs can do more harm than good. Too much nitrogen can damage the roots and leave brown or yellow patches behind.
If fertilizer burn occurs, water the area thoroughly to help flush excess nutrients from the soil. Using slow-release fertilizers and following the label’s recommended application rate can help prevent the problem from happening again.
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