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紫丁香花为总状圆锥花序，根据观察研究结果，紫丁香在呼和浩特市区有如下的开谢规律，①整个植株的开花顺序为自上而下，即植株顶部的先开放，基部随后才开放。开放时间每年大约从４月底开花至５月中旬结束，可持续１５～２则左右；②每个花序的开花顺序则是由基部向顶端逐渐开放；③单朵花的开花期由花蕾形成至花谢大约持续１２ｄ，其中花展平期可持续５～７ｄ；④整体而言，从开花第ｌｄ起，植株上开花的数目逐日增多，第６ｄ达到最高，净开花率为３２．１％，而总开花率达到７５．２％，因而此时可作为紫丁香精油提取的最大采花期。
Lilac flowers are panicles, according to the results of observation, lilac in the Hohhot urban areas have the following Kai Xie law, the entire plant flowering order from top to bottom, that is, the top of the plant first open, the base then opened . The flowering time is approximately from the end of April to the end of May, lasting about 15 ~ 2; ②The flowering order of each inflorescence is gradually opened from the base to the top; ③ The flowering period of single flower is formed from bud to flower Xie continued for about 12 days, of which the flowering period of sustainable 5 ~ 7d; ④ Overall, from the first day of flowering, the number of flowering plants increased day by day, reached the highest on the 6th day with a net flowering rate of 32.1% The total flowering rate of 75.2%, which can be used as the lilium essential oil extraction of the largest flowering.