Lawn dethatching is a similar process to lawn sweeping. A lawn dethatcher uses a row of long tines that graze the surface of the lawn, loosening old grass cuttings, twigs and other small debris. Lawn dethatching is an effective process if you have a buildup of mulch or other debris on your lawn. Dethatching allows the lawn to take in nutrients and water more effectively. Lawn dethatchers can be fitted to lawn sweepers. If you do not sweep, the leftover thatch should still be raked or otherwise removed. Dethatchers can be rented or purchased in power or manual push designs. Dethatching services can also be purchased as part of a lawn care service package. If you are going to purchase a dethatcher, beware of cheap units with tines made of weak alloys.