pruning my 3mth old crape myrtle
we planted this tuscarora crape myrtle 3 mths ago. I have read a bit about it and realize that it is supposed to be a tree once it grows a bit. We planted it out front and want it to be a tree not a bush......Should we prune the bottom branches to encourage it to become a tree or should we let it grow some more before we prune the bottom branches near the trunk? We just want to be certain it grows into a tree as opposed to a bush/shrub.