Abstract: The present invention relates to a method for enhancing harvest security of crops needing vernalization comprising the steps: a) advanced seeding of a crop variety before seeding of such crop variety is generally carried out in the respective area, and b) 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). In addition, the invention relates to the use of a mixture comprising at least two active compounds (A) selected from mepiquat chloride, chlormequat chloride, N,N-dimethylmorpholinium chloride, metconazole, tebuconazole, paclobutrazol, trinexapac and prohexadion or an agriculturally useful salt thereof for enhancing harvest security of crops needing vernalization.