Herbicidally active novel 2,5-dihydropyrroles of the formula ##STR1## wherein R.sup.1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R.sup.2 and R.sup.3 each represent an alkyl group having 1 to 4 carbon atoms or a haloalkyl group having 1 to 4 carbon atoms or together may form a C.sub.2 -C.sub.6 alkylene group which may be substituted by halogen, and R represents a hydroxy group, a mercapto group, a halogen atom, an amino group or a group of the formula --O--W in which W represents an alkylcarbonyl, a halogenoalkylcarbonyl, an alkoxycarbonyl or a halogenoalkoxycarbonyl group each having 1 to 4 carbon atoms in the alkyl group, an alkylsulfonyl or a halogenoalkylsulfonyl group each having 1 to 4 carbon atoms in the alkyl group or a di-C.sub.1 -C.sub.4 -alkylamino sulfonyl group.