A method for controlling unwanted plants or inhibiting their growth, comprising: (i) applying a herbicidally effective amount of a herbicidal composition comprising: (A) flazasulfuron or its salt and (B) at least one selected protoporphyrinogen oxidase inhibitor from the group consisting of: pyrafluphenethyl, carfentrazone-ethyl, sulfentrazone, flumioxazin, butafenacil, saflufenacil, oxadiargyl, pentoxazone, flutiacet-methyl, piraclonyl and flufenpyr-ethyl and their salts or comprising: (ii) apply amounts of herbicidal components (A) and (B), in which (A) is flazasulfuron or its salt and (B) is at least one protoporphyrinogen oxidase inhibitor selected from the group consisting of: piraflufen-ethyl, carfentrazone-ethyl, sulfentrazone, flumioxazin , butafenacil, saflufenacil, oxadiargyl, pentoxazone, flutiacet-methyl, piraclonyl and flufenpyr-ethyl and their salts, to unwanted plants or to a place where they are grown, in which the plants do not They are: Persian veronica, blackberry grass, sticky chickweed, common white ash, crazy oatmeal, sesbania rostrata, Bengal hemp, abuta, bermuda grass, Japanese millet, corn, bell of ivy or cane leaves and in which said composition presents a synergistic herbicidal effect or in which the combination of components (A) and (B) has a synergistic herbicidal effect.Un método para controlar plantas no deseadas o inhibir su crecimiento, que comprende: (i) aplicar una cantidad herbicidamente eficaz de una composición herbicida que comprende: (A) flazasulfurón o su sal y (B) al menos un inhibidor de la protoporfirinógeno oxidasa seleccionado del grupo que consiste en: piraflufenetilo, carfentrazona-etilo, sulfentrazona, flumioxazin, butafenacilo, saflufenacilo, oxadiargilo, pentoxazona, flutiacet-metilo, piraclonilo y flufenpir-etilo y sus sales o que comprende: (ii) aplicar cantidades herbicidamente eficaces de los componentes (A) y (B), en las que (A) es flazasulfurón o su sal y (B) es al menos un inhibidor de la protoporfirinógeno o
