A guide released on Apr. 26 provides detailed information about why, when, and how homeowners should dethatch their lawns to maintain healthy grass. The guidance emphasizes that removing excess thatch is important for lawn health and appearance.
The guide explains that thatch is a layer of organic material between the grass blades and soil surface. While a thin layer can help retain moisture and suppress weeds, too much thatch—more than half an inch thick—can block water, oxygen, and nutrients from reaching the soil. This can make lawns more vulnerable to stress, pests, disease, and weed growth.
Different methods are recommended based on the type of grass and level of thatch buildup. Manual dethatching rakes are suggested for small areas with light buildup; power rakes work best for medium to large lawns with moderate or heavy buildup; verticutters are suitable for dense grasses like bermudagrass or zoysiagrass. The guide notes: “Manual dethatching rakes are a convenient option for small or hard-to-reach areas with light thatch buildup.” It also says: “Power rakes are best for medium to large lawns with moderate to heavy thatch buildup,” while “Verticutters are best for dense, creeping grasses like bermudagrass and zoysiagrass.” Liquid dethatchers and aeration may help prevent future problems but do not remove thick layers.
Proper timing is important according to the guide. Warm-season grasses should be dethatched in late spring or early summer; cool-season grasses benefit most from dethatching in early fall or early spring as a second choice. Homeowners should measure their lawn’s thatch before deciding whether removal is needed.
Aftercare following dethatching includes removing debris from the lawn surface, watering thoroughly if no further treatments will be applied immediately, or following up with aeration, overseeding, fertilization as needed.
The guide concludes by recommending professional help if necessary: “After dethatching, your lawn will have greater access to nutrients, water, and oxygen. To manage the new lush growth…hire a local lawn care professional.”
