Apparatus for treating turf, comprising: a cylindrical rotor (20), rotatable about an axis, the rotor having: a first helical track portion (25a) having a first helical track (26a) extending about the axis in a first direction from a first end towards a central portion thereof； a second helical track portion (25b) having a second helical track (26b) extending about the axis in a second direction between a second end and the central portion thereof； wherein each helical track portion comprises at least one helical track having a plurality of teeth (24) arranged therealong.
