(1)晾根法。在8月下旬至9月上旬,扒开植株根部10—15厘米厚的表土层,使部分根系外露,并可以扒断部分细根。如此晾晒2至3周后,增施有机肥料并覆土。此法可以推迟花期半月以上,有效避开冻害的发生期。(2)夏季修剪法。根据各地气候条件、选择合理时期进行夏季修剪,促使夏梢抽发健壮,花芽分化适当推迟。实验证明夏剪树花期比不剪树推迟10天左右,终 (1) Air root method. From late August to early September, the 10-15 cm thick topsoil of plant roots is stripped to expose some of the roots and to cut off some fine roots. So dry 2 to 3 weeks after the addition of organic fertilizer and soil cover. This method can be delayed flowering more than half a month, effectively avoid the occurrence of frost damage. (2) Summer pruning method. According to local climatic conditions, select a reasonable period of summer pruning, prompting summer shoot pumping robust, flower bud differentiation appropriate postponed. Experiments show that summer cut tree flowering than not cut trees postponed about 10 days, finally