A method of providing a plant with stress resistance, comprising applying at least one substance (A) to the plant, said at least one substance (A) being selected from the group consisting of a compound represented by Formula (I) and the like and salts thereof. Phytotoxicity of a plant due to agricultural chemicals is reduced by providing the plant with stress resistance. [In Formula (I), R 1 to R 4 each independently represents a hydrogen atom, -SO 3 H, -PO 3 H 2 , a glycosyl group or -COR 11 . R 11 represents an unsubstituted or substituted C1 to C30 alkyl group or an unsubstituted or substituted C2 to C30 alkenyl group.].
