How to Thatch Lawns

All grass has a layer of thatch that exists between the soil and the grass. Thatch is made up of dead grass stems and roots. Over time this thatch thickens and can lead to lawn problems.
A thin layer of thatch is actually good for the lawn because it insulates the grass form extreme temperatures. Thatch also cushions grass and helps it withstand traffic. If thatch is allowed to accumulate to more than one-half inch in thickness, however, a lawn will be at risk of drought and insect infestation.
The best way to reduce accumulated thatch is core aeration. This is a process of taking out pieces of soil from under the thatch layer and placing them on the top of the lawn. This removed soil contains fungi and bacteria that will facilitate the decomposition of the thatch layer. Another benefit of core aeration is the ability of water and air to enter the soil through the holes. This further encourages thatch breakdown.

Difficulty: Moderately Challenging

Instructions

Things You'll Need:

• Dethatching rake Lawn mower with dethatching blade Dethatcher Soil aerator

How to Thatch a Lawn

1. With the dethatching rake, try to remove as much of the thatch layer as possible. If this is not effective, install a dethatching blade on a lawn mower and use the lawn mower to work the thatch loose from the lawn. Work carefully and do not allow the blade to reach down to the soil level. Keep it on top at the thatch level. Pass the dethatching equipment over the grass only one time.

2. If a dethatching blade for a lawn mower is not available, a dethatcher can be rented from a rental company. Be sure to be completely familiar with the operation of this equipment before using it.

3. When the thatch is completely removed, rake up the debris and compost it.

4. If these thatch methods do not work, the next step is to use an aerator. These can be rented.
   Use an aerator on a moist but not wet lawn. Be completely familiar with the operation of the aerator prior to use. Aerate the lawn in two directions for best results. Steep slopes can be challenging, and be careful when operating the aerator around obstacles in the yard.

Tips & Warnings

• Lawns may be fed and seeded immediately after aeration. If soil is very compacted, applying compost to fill aeration holes may improve the condition of the lawn. Lawns can be aerated annually.