We have 6 white crepe myrtles that are turning yellow and losing their leaves, down here near San Antonio, TX. The weather's been cooling, with lows at night in the 40s, sometimes in the 30s, daily highs in the 60s and 70s. A neighbor down the street, however has some that are still solid green, with thick, rich bright pink blossoms, like it was still springtime. I'm wondering if it's because they have a different variety from ours, or if something's wrong.