Herbicidally active sulphonylamino guanidinoazines of the formula ##STR1## in which R.sup.1 stands for a optionally substituted radical from the series comprising alkyl, aralkyl, aryl and hetaryl, R.sup.2 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl, hetaryl and dialkylamino, R.sup.3 stands for hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X stands for nitrogen or a --CH-- grouping,Y stands for nitrogen or a --CR.sup.4 -- grouping,whereinR.sup.4 stands for hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl,Z stands for mitrogen or a --CR.sup.5 -- grouping,whereinR.sup.5 stands for hydrogen, halogen, hydroxyl, alkyl, alkoxy, halogenoalkoxy, alkylthio, alkylamino or dialkylamino, andM stands for hydrogen, a metal equivalent, an ammonium equivalent, an alkylammonium equivalent, a dealkylammonium equivalent, or a trialkylammonium equivalent,excluding N'-(4,6-dimethyl-pyrimidin-2-yl)-N"-(4-methyl-phenyl-sulphonylamino)-N"'-(2-chloro-phenyl-sulphonyl)guanidine.