Answer: If left unpruned, privet will actually grow somewhat like a multiple trunked tree, bare at the base and wider branched and rounded at the top. The branches at the top shade out the lower growth. You could accentuate this tendency by keeping it to just a few main stems and allowing them to develop like trunks, and pruning off any lower growth to keep directing energy to the top branches. I would not try to do a single stemmed tree form however as this would be somewhat likely to snap in storms. Good luck with your project!
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