Where we live, it is right on the border of where crape myrtles thrive. We live in an area that refuses anything that isn’t ornamental and I thought to myself … there aren’t any crape myrtles around here and they are extremely ornamental. One of the biggest reasons for doing it here is that the soil is rather compacted. Crape myrtles have amazing root structures and they extend farther than most other roots. They will help naturally amend the soil. They are easily managed, because they’re so easily pruned and can be maintained at a certain height or width, depending on what you want them for. Also, the area that we have for planting them is extremely open, so it’s full sun all day long and they would love that. They have very few known diseases or pests, so they stay healthier much easier too. The aphids which feed on crape myrtles do not feed on other nearby plants and when they do feed on them, they excrete honeydew. The honeydew produced by these aphids also feeds the fungus, sooty mold. which feeds more than a couple of dozen other insects that are predator insects … that control all of the harmful pests. The crape myrtle is one of, if not the most important tree to plant for insect control. You need to plant them in groups of 4 - 8 to reach maximum benefit, however. During droughts, these trees producing these aphids could very well be the only food source for them. The beauty about it is also that they will grow in any kind of soil you have. They grow rapidly and they aren’t too big. They are drought and alkaline resistant, as well as extremely easily transplanted. Finally, deer don’t like them (trouble with deer around the area) and they make great deciduous screens for privacy. So many reasons for having them that I couldn’t find many to not have them.