The best way to control thatch is to avoid a buildup in the first place. Here are some maintenance practices that will help.

Cut grass at the recommended height for your turf at regular intervals to avoid depositing too many clippings at one time. Fertilize only in the fall to reduce excessive growth. Promote microbial life by maintaining a proper soil pH. Aerate the lawn once a year.

If thatch does begin to accumulate to undesirable levels, apply a top dressing of a compost-and-soil mixture prior to aerating in the spring and fall. The organic matter will promote microbe activity, which in turn will help decompose thatch.

Courtesy Yardcare.com