Lawn Dethatcher Are weeds and crab grass a problem for you? Then you need this attachment! Quickly removes weeds and the tan-looking built-up "thatch" that can choke your lawn. The 60 spring-steel picks let you dethatch a 15" swath with a single pass. Thatch harbors insects, creates a water barrier, and prevents new grass from growing. Dethatch your lawn regularly in spring and fall, especially before feeding and fertilizing. Models Available for all Tillers