A healthy lawn doesn’t happen by accident. Over time, even well-maintained lawns can develop issues that affect their appearance and performance. One of the most common concerns homeowners face is thatch buildup.

In this edition of Healthy Lawns with Dr. Jim, Dr. Jim Wilkinson, founder and owner of SeaScape Lawn Care, explains what thatch is, why it develops, and when it becomes a problem for your lawn.

What Is Lawn Thatch?

Thatch is a layer of organic material that forms between the soil surface and the green, growing grass blades. It consists primarily of:

• Dead grass stems
• Grass roots
• Other decomposing plant material

As your lawn grows and naturally sheds organic matter, some of that material breaks down and returns nutrients to the soil. However, when decomposition cannot keep pace with accumulation, a thatch layer begins to develop.

Why Do Some Lawns Have More Thatch Than Others?

Not every lawn develops a significant thatch problem. According to Dr. Jim, the amount of thatch that accumulates often depends on the species or variety of grass growing in the lawn.

Some turfgrass varieties naturally produce more stems and roots, which can lead to faster thatch buildup. Other grasses decompose more efficiently and may never develop problematic levels of thatch.

This means two neighboring lawns may have very different thatch conditions even if they receive similar maintenance.

Is Thatch Always Bad?

The answer is no.

A small amount of thatch can actually be beneficial. A thin layer provides cushioning that helps protect the lawn from:

• Foot traffic
• Lawn mowing equipment
• Children’s play activities
• Outdoor gatherings and events

This natural cushioning effect can help reduce stress on turfgrass and contribute to a healthier lawn.

When Does Thatch Become a Problem?

Problems begin when the thatch layer becomes excessively thick.

As a general guideline, Dr. Jim recommends paying attention when thatch approaches one inch in thickness. At this point, the thatch layer can start interfering with normal lawn functions.

Water Penetration Issues

One of the biggest concerns with excessive thatch is water management.

When thick thatch dries out, it becomes difficult to rewet. Instead of soaking into the soil where grass roots need it, water may run off the surface.

This can reduce the effectiveness of:

• Rainfall
• Irrigation systems
• Sprinkler watering

The result is less moisture reaching the root zone, even when you’re watering regularly.

Increased Pest and Disease Activity

A thick thatch layer can also create an ideal environment for lawn pests and diseases.

Excessive thatch provides shelter for insects such as:

• Chinch bugs
• Billbugs

These pests can remain hidden within the thatch layer before eventually causing damage to your lawn. Thick thatch may also contribute to conditions that encourage certain lawn diseases.

How Do You Know If You Have Too Much Thatch?

If your lawn feels unusually spongy when you walk on it, or if water seems to run off instead of soaking in, it may be time to inspect for thatch buildup.

A simple lawn inspection can reveal whether the organic layer between the soil and grass blades has become too thick.

Managing Thatch for a Healthier Lawn

The key is balance.

A thin layer of thatch can benefit your lawn, but excessive buildup can create watering problems, increase pest pressure, and reduce overall turf health.

If your lawn’s thatch layer is approaching an inch thick, it’s time to consider corrective measures and professional evaluation.

Trust the Lawn Care Experts at SeaScape Lawn Care

At SeaScape Lawn Care, we help homeowners identify and address lawn problems before they become costly issues. Through expert turf management, soil health programs, and customized lawn care solutions, we help keep your lawn healthy, beautiful, and resilient year-round.

If you’re concerned about thatch buildup or want a professional lawn evaluation, contact SeaScape Lawn Care today.

About Dr. Jim Wilkinson

Dr. Jim Wilkinson is the founder and owner of SeaScape Lawn Care and the host of the Healthy Lawns with Dr. Jim educational series. With decades of experience in turfgrass management and lawn care, Dr. Jim helps homeowners better understand how to achieve and maintain healthier lawns.