Disclosed herein is a method for enhancing harvest security of crops needing vernalization comprising the steps: advanced seeding of a crop variety before seeding of such crop variety is generally carried out in the respective area； and applying a mixture comprising at least two active compounds (A) selected from the group consisting of mepiquat chloride, chlormequat chloride, N,N-dimethylmorpholinium chloride, metconazole, tebuconazole, paclobutrazol, trinexapac and prohexadion or an agriculturally useful salt thereof to the crop variety seeded according to step a)； wherein the crop needing vernalization is selected from winter wheat, winter triticale, winter barley, winter rye, winter oat, winter oilseed rape and winter sugar beet. Additionally, wherein the mixture applied in step b) comprises at least two compounds (A) and at least one compound (B) selected from boscalid, dimoxystrobin, difenoconazole, prothioconazole, prochloraz, thiophanatmethyl and iprodione. Additionally, wherein the seed of the crops needing vernalization is treated with at least one compound (C) selected from N-(3',4',5'trifluorobiphenyl-2-yl)-3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxamide, N-[2-(4'trifluoromethylthio)-biphenyl]-3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxamide, N(3',4'-dichloro-5-fluorobiphenyl-2-yl)-3-difIuoromethyl-1-methylpyrazole-4-carboxamide (common name: bixafen), N-[2-(1,3-dimethylbutyl)-phenyl]-1,3-dimethyl-5-fluoro-1H-pyrazole- 4-carboxamide, N-(2-bicyclopropyl-2-yl-phenyl)-3-d ifluoromethyl-1-methyl-1 Hpyrazole- 4-carboxamide (common name: sedaxane), N-[1,2,3,4-tetrahydro-9-(1-methylethyl)-1,4-methanonaphthalen-5-yl]-3-( difluoromethyl)-1-methyl-1H-pyrazole-4-carboxamide (common name: isopyrazam) and N-[2-(1,3-dimethylbutyl)-3-thienyl]-1-methyl-3-(trifluoromethyl)-1H-pyrazole-4-carboxamide (common name: penthiopyrad), boscalid, dimethomorph (OMM) and metconazole before seeded according to step a).
