Answer: Crispy leaf margins usually indicate a soil pH problem. Crape myrtles have a tendency toward chlorosis or marginal leaf burn in alkaline or saline soil. Since you've already monitored your watering practices and have been careful with fertilizers, I think the only explanation is soil pH. I'd have the soil tested, either through your local Cooperative Extension office or a private lab. Once the soil has been analyzed, the results will mailed to you along with recommendations for improving it. In Ventura County, contact your Extension office at 699 County Sq. Dr. #100, 93003, phone 805-645-1451. Best wishes with your tree!
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