What practice is most effective in reducing thatch?

Aeration is considered the most effective practice for reducing thatch because it addresses the root cause of thatch buildup. Thatch is a layer of organic matter, primarily made up of dead grass clippings, roots, and other plant materials, that accumulates on the soil surface. Excessive thatch can impede water and nutrient uptake and create an environment conducive to pests and diseases.

Aeration involves creating small holes in the soil, which allows air, water, and nutrients to penetrate deeper into the root zone. This process not only helps break down thatch by enhancing microbial activity within the soil but also encourages new grass growth and improves overall lawn health. By promoting better soil conditions and reducing compaction, aeration facilitates an environment that can naturally regulate and reduce thatch levels over time.

Other practices, such as hand-pulling or increasing mowing frequency, can provide some benefit, but they do not effectively address the underlying issues related to thatch accumulation. Similarly, adding fertilizer might support grass growth but does not directly reduce thatch buildup and may even exacerbate the problem if not managed properly. Thus, aeration stands out as the most comprehensive and effective method to combat thatch.