An apparatus for treating turf, comprising: a cylindrical rotor, rotatable about an axis, the rotor having: a first helical track portion having a first helical track extending about the axis in a first direction from a first end towards a central portion thereof； a second helical track portion having a second helical track 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 arranged therealong.
