A method for growing plants, wherein said method comprises at least the steps of (i) supplying at least one plant defence inducer [inducer, herein after] or a salt thereof to at least part of a plant, or a seed, in an amount that is sufficient for inducing plant protection against pests, wherein said inducer P has phytotoxic side effects and has a general formula (I P): wherein - each of X is independently selected from O, S, or NR 4, wherein R 4, equal to or different from each other and at each occurrence, is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, or OR 5, and wherein each of R 5, equal to or different from each other and at each occurrence, is C 1-4 alkyl; - each of R is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, and wherein said C 1-36 alkyl, or C 2-36 alkenyl are optionally substituted with one or more substituents selected from halo, C 1-4 alkyl, or CF 3; - each of R 1 is C 1-6 alkyl; - each of R 2 is independently selected from hydrogen, or C 1-6 alkyl; and - each of R 3 is independently selected from hydrogen, C 1-10 alkyl, C 2-10 alkenyl, COR 7, or C OR 7, and wherein each of R 7, equal to or different from each other and at each occurrence, is independently selected from C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl, and wherein said C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl are optionally substituted with one or more substituents independently selected from halo, or CF 3; and (ii) reducing or avoiding said phytotoxic side effects by supplying additionally to the at least part of the plant or the seed, at least one compound [compound, herein after] selected from salts, chelates, oxides or hydroxides of iron or iron, wherein the compound and the inducer are supplied concomitantly in a liquid form. (i) supplying at least one plant defence inducer [inducer, herein after] or a salt thereof to at least part of a plant, or a seed, in an amount that is sufficient for inducing plant protection against pests, wherein said inducer P has phytotoxic side effects and has a general formula (I P): wherein - each of X is independently selected from O, S, or NR 4, wherein R 4, equal to or different from each other and at each occurrence, is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, or OR 5, and wherein each of R 5, equal to or different from each other and at each occurrence, is C 1-4 alkyl; - each of R is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, and wherein said C 1-36 alkyl, or C 2-36 alkenyl are optionally substituted with one or more substituents selected from halo, C 1-4 alkyl, or CF 3; - each of R 1 is C 1-6 alkyl; - each of R 2 is independently selected from hydrogen, or C 1-6 alkyl; and - each of R 3 is independently selected from hydrogen, C 1-10 alkyl, C 2-10 alkenyl, COR 7, or C OR 7, and wherein each of R 7, equal to or different from each other and at each occurrence, is independently selected from C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl, and wherein said C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl are optionally substituted with one or more substituents independently selected from halo, or CF 3; and - each of X is independently selected from O, S, or NR 4, wherein R 4, equal to or different from each other and at each occurrence, is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, or OR 5, and wherein each of R 5, equal to or different from each other and at each occurrence, is C 1-4 alkyl; - each of R is independently selected from hydrogen, C 1-36 alkyl, C 2-36 alkenyl, and wherein said C 1-36 alkyl, or C 2-36 alkenyl are optionally substituted with one or more substituents selected from halo, C 1-4 alkyl, or CF 3; - each of R 1 is C 1-6 alkyl; - each of R 2 is independently selected from hydrogen, or C 1-6 alkyl; and - each of R 3 is independently selected from hydrogen, C 1-10 alkyl, C 2-10 alkenyl, COR 7, or C OR 7, and wherein each of R 7, equal to or different from each other and at each occurrence, is independently selected from C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl, and wherein said C 1-4 alkyl, C 2-4 alkenyl, or C 2-4 alkynyl are optionally substituted with one or more substituents independently selected from halo, or CF 3; and (ii) reducing or avoiding said phytotoxic side effects by supplying additionally to the at least part of the plant or the seed, at least one compound [compound, herein after] selected from salts, chelates, oxides or hydroxides of iron or iron,