What season is it to work in the Forbidden City?

The original poem of The Imperial Palace Que Xia Zuo is "Jiazi arrived in Lilinggui from Changsha in summer and May, in order to get away, so as to chat and send secret words". The purple flower mentioned in the poem is also a summer flowering plant, also known as Lagerstroemia indica, which is a symbol of Zhongshu Province in the Tang Dynasty. Therefore, under the imperial palace and in front of the main hall, there are purple flowers, indicating that the poet works in the central organ in summer, but he is bored and tired, and wants to stay away from the disputes and constraints of the court and give his feelings to nature and friends.