Answer: Wisteria becomes ever stronger as it ages and it can easily grow as thick as a man's arm. The best supports I have seen are granite boulders and hefty brick piers; other succesfull supports have been made with extremely sturdy beams of about 6 by 6 inch dimensions. Alternatively you might try training it as a standard set in the middle of a grass lawn area. This can be done using a very heavy iron pipe.
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