A vegetation cutter (1) intended to mechanically separate vegetation (4), such as control of e.g. control weeds (2) and/or other undesired crops or vegetation from desired crops or vegetation (19) on a land surface (3). Said vegetation cutter (1) is movable during use in a direction (6) through the vegetation (4) at the same time as it comprises a number of knife devices (5) arranged in a distance (7) from each other, each knife device (5) having at least one cutting function (22) working in or towards said distance (7), the sterns (8) of said vegetation (4) in cross section have various thickness (9) or diameters, such as coarser thickness (10), mainly constituting the weed (2) and/or the undesired crops, said vegetation (4) also having narrower thickness or diameters (11) mainly constituting desired crops or vegetation (19) and said distance (7) on at least some place being shorter than the coarser thickness (10) or the diameters at least at that place, where the cutting fiinction (22) works, so that the cutting function (22), when it is moved through the vegetation (4), cuts off or damages the coarser thickness (10), so that they fade, while the narrower thickness (11) mainly can pass the cutting function (22) without being damaged, so that they remain undamaged and can grow on further.
