Answer: You can do this easily. You will need to put a strong pole, such as a piece of steel, next to the plant but about 3 inches away from the base. Use a stake that is a little taller then the height at which you will want to start your branching. Keep the tree trimmed from the base to the place you want it to start branching. It is that simple. Wisteria wants to stay a vine so at least for a few years you will have to keep trimming. The need to trim will be less each time until it is trained as a tree.
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