Should I prune my crape myrtle to one trunk or several?

Most crape myrtles are pruned to an odd number of trunks, usually three or five. University of Memphis Director of Landscape Joellen Dimond talks about how to do it.
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Related Videos:
Crape Myrtles
Pruning (Not Murdering) Crape Myrtles
Treating Crape Myrtle Bark Scale

Related Resources:
Crape Myrtle Culture
Crapemyrtle - Flower of the South