I love crepe myrtles....I really do. We had a bit of landscaping done this summer and they planted 2 nice sized crepe myrtles. It was 100 degrees at the time, hot wind blowing and the bushes began to suffer. The leaves started to curl, the blooms were wilted so I got out the pruning shears (actually my scissors). I cut off all of the blooms and watered the heck out of them. In no time they began to perk up. You know transplanting during the blooming season is very hard on plants, much less when the weather is so HOT.
Buds began to reappear:
And blooms opened:
And once again the crepe myrtle blooms:
I trim the blooms off every year when they start to die and get two sets of beauty. I read this in southern living years ago and I'm here to tell you this trick works!! I love it.