To obtain an excellent herbicide, to provide a method for preparing the herbicide and a method for using the herbicide.

A method for suppressing the growth of undesirable plants in the site comprises applying at least one kind of compound represented by formula (I) [wherein X represents N or CR2; R1 represents a halogen atom, an alkyl group, an alkenyl group, or the like; R2 represents hydrogen atom or R1; R3 represents hydrogen atom, formyl group, an alkyl group, or the like; A represents an aryl group, a nitrogen-containing heteroaromatic group or thienly group; Z represents oxygen or sulfur atom or single bond; (m) is 0 or 1 or 2] or its salt permissible on crop culture or N-oxide thereof.