A grass treatment device comprises: a first grass treatment element disposed towards a front portion of the device; a second grass treatment element disposed towards a rear portion of the device; a third grass treatment element disposed substantially between the first and second grass treatment elements, the third element being in the form of a grass cutting tool; and a fourth grass treatment element connectable at a position substantially between the first grass treatment element and the grass cutting tool, the grass treatment elements being elongate and having their longitudinal axes disposed substantially parallel to each other, the grass treatment device characterized in that the fourth grass treatment element is configured to be displaced from the position located between the first grass treatment element and the grass cutting tool in order to enable the first grass treatment element to substantially occupy the position.