Answer: Crape myrtles bloom on new shoots of the season so a cold snap while the flower buds are forming can cause some damage. Aside from cold weather, immaturity and over fertilization can affect the flower buds. I would allow them to flower next spring then prune them back lightly. The new growth the pruning prompts should flower again later in the summer. This second flush of flowers should open completely. Be sure to water your trees on a regular basis, but don't feed them until next year.
Best wishes with your trees!
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