How does crape myrtle prevent colds?

Pruning of Lagerstroemia indica is generally carried out in winter. When pruning, keep the branches evenly distributed and the crown intact, cut off the long branches, sprouted branches on the trunk and inappropriate branches, cut off 2/3 of the long branches, and generally keep the branches cut about 6cm in the last winter. After pruning, the wound was coated with callus antiseptic film to make it heal quickly, and sprayed with tree protector to survive the winter safely.