We just purchased an Antebellum home that has a crape myrtle dating back to pre-civil war. The limbs are straggly and a good portion appear dead. Top limbs are about 25' high and there were very little foliage and blooms on the tree this summer. How far back can I, or should I cut it to get good foliage and blooms? We are in Vicksburg, MS and crape myrtles seem to be plentiful in the area. Also, when would the best time be to do this given our mild winters?