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.La présente invention concerne un appareil de coupe de végétaux (1) destiné à séparer mécaniquement des végétaux (4) de sorte à dissocier les mauvaises herbes (2) et/ou d’autres plantes indésirables de celles cultivées ou utiles (19) sur une surface de terre (3). Ledit appareil (1) est mobile lors de son utilisation dans une direction (6) traversant les végétaux (4) et comprend une pluralité de dispositifs coupants (5) espacés d’une certaine distance (7), chaque dispositif (5) ayant au moins une fonction de coupe (22) dans ou vers cette distance (7), les tiges (8) des végétaux (4) en coupe présentant des épaisseurs (9) ou diamètres variables, une épaisseur supérieure (10) caractérisant sensiblement les mauvaises herbes (2) et/ou les plantes indésirables alors qu’une épaisseur ou un diamètre moindre (11) cara
