Answer: Usually lack of bloom occurs with cold damage or lack of available phosphorus. Sometimes, when fertilzing lawns, fertilizer spreaders drop more than the desired amount in one spot. It could be that the non-flowering crape myrtle got an overdose of nitrogen that discouraged flowering. That seems kind of far fetched, especially if it shows no excess vegetative growth. If it's of a different variety than its neighbors, it may not be as tolerant of the strange weather we've had over the past year. Sorry I can't be more helpful!
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