Thatch is a layer of partially decomposed plant material that
builds up on the soil’s surface. Usually, more than one half
inch of thatch on general turf areas decreases the turf vigor by
restricting movement of air, water and fertilizers into the
soil. Excessive thatch also restricts root development and
provides a suitable environment for insect and disease problems.
Thatch can be removed by a vertical mower or by other means of
dethatching such as a power rake. Vertical mowing helps keep
turf healthy by removing the vegetation from the thatch layer.
This dead vegetation is lifted to the surface by the blades of
the vertical mower. Vertical mowing can be done in the early
spring on warm season grasses just before green up occurs, or
when the grass is growing rapidly yet not so hot that the water
requirements are high. Dethatching equipment can be rented from
local nurseries or rental companies. Remember to fertilize after
dethatching because the turfgrass has been damaged and needs the
stimulation to recove