Answer: Crepe myrtle does best in a well drained soil, so you may be over watering it. However, these symptoms can also indicate under watering. Your goal in watering is to keep the soil evenly moist but not sopping wet. To know when to water, use your finger to dig down and check the soil. Check the potting soil and the surrounding soil because they can dry out at different rates. After watering, wait a few hours, then dig down and see how effective your watering was. It can be surprising. It is best to water deeply less often rather than a daily light sprinkling. Also, covering the root area with several inches of organic mulch can help keep the soil more evenly moist as well as help keep down weeds.
Transplant shock can also show as wilting and sometimes defoliating, especially if the weather is hot and dry or if the plant travelled in the back of an open truck or car and was exposed to wind. Careful watering and patience are the best you can do for transplant shock.
Finally, since you just purchased the plant, you might want to consult with the nursery where you got it to see if they have any insight to offer. Good luck with your crepe myrtle!
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