Answer: The height and spread of the Tuscarora Crape Myrtle ultimately depends upon the growing conditions and whether or not the tree is regulary pruned. In normal landscape growing conditions it will reach a mature height of 15-20 feet with a spread of 15 to 18 feet. This tree will work in a 15' space if you prune it annually. And, since crape myrtles bloom on new wood, pruning back early each spring will ensure an attractive canopy.
Catawba trees are related to Catalpa trees and may reach heights of 70 feet tall and 40 feet wide; not a good choice for a small yard. I'd plant two crape myrtles instead, planting them a minimum of 15-20 feet apart.
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