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