Method for promoting secondary germination of peony in spring and application

The invention relates to a method for promoting secondary germination of peony in spring and application, and belongs to the technical field of peony cultivation. Comprising the following steps: S1, in the first ten days of March in spring, when flower buds on peony branches germinate primary branches for the first time and young leaves of new branches are not unfolded, the young leaves at the upper ends of the new branches and young buds are cut off together, meanwhile, leaves of the young leaves below are cut off, and petioles are reserved; s2, after pruning, immediately applying a mixed solution of 14-hydroxybrassinosterol and gibberellin GA3 to the axils of the remaining branches, once a day, and continuously applying for 2-4 days; s3, about 20 days later, 5-8 new lateral branches are germinated on the primary branches for the second time, and the new lateral branches are secondary branches germinated for the second time in spring. By means of the method, the single-stem peony can be rapidly formed, high