Crop-selective herbicides prepared by mixing a first non-selective herbicidal component selected from among glyphosate, glyphosine, bialaphos and glufosinate with a second component selected from among phosphorous acid derivatives, chitosans, metal salts of isopropyl phosphate, metal salts of organic acids and so on, and, if necessary, a third component such as a fungicide. By virtue of the second component, the herbicides do not completely kill weeds in spite of the action of the non-selective herbicidal component but can retard the growth of weeds, so that the herbicides are applicable to hillsides and usable as crop-selective herbicides reduced in the chemical damage to useful crops.