What is the minimum growth temperature of Lagerstroemia indica?

Lagerstroemia indica (Latin name: Lagerstroemia indica), alias: itchy flower, itchy tree, purple flower, purple orchid, mosquito flower, Myrica rubra, zinnia, skinless tree. It is a dicotyledonous plant, deciduous shrub or small tree of Lysimachiaceae and Lagerstroemia, with a height of 7 meters; Bark is smooth, gray or grayish brown; Twisted branches, slender branchlets, alternate or sometimes opposite leaves, papery, oval, oblong or obovate, green to yellow when young, purple-black when mature or dry, and ventricular dehiscence;