Dethatching Bermudagrass: When It's Needed and How to Do It

Thatch—a layer of partially decomposed stems and clippings—exceeding ½ inch restricts air, water, and fertilizer movement, weakens roots, and harbors pests. Bermudagrass and zoysiagrass benefit most from dethatching; fescue rarely needs it.

Assess Before You Act

Dig a small plug. If thatch < ½ inch, do not dethatch. Bermudagrass only develops problematic thatch when over-fertilized and mowed infrequently.

Best Time and Method

• Timing: Early spring (just before green-up) or when grass is growing rapidly but not under heat stress.
• Equipment: Vertical mower (power rake) or dethatching blade on a mower. Rent from nurseries/rental centers.
• Aftercare: Fertilize to stimulate recovery.

Reader Q&A

Q: How should a dethatching mower blade be used on bermudagrass?

A: First, confirm you have a thatch problem. If thatch < ½ inch, don't dethatch. Right now (late winter), the best practice is to lower your regular blade ½ inch and mow off the brown winter stems. Dethatch only in June when bermudagrass is vigorously growing.