When do you trim a wisteria?

The plant is about 5 years old.

When do you trim a wisteria?
Remember that it blooms on old wood. Keep hands (with five leaves) and trim whips (long stringers).Trim as needed to keep long growth you don't want and trim for shape during the winter in mild areas.
Reply:Trim in the fall. I like to trim in the winter. No bugs and diseases. With Wisteria you trim hard(a lot).

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