Q. When is the best time to cut back Wisteria?A. Wisteria need pruning twice a year, in January/February and July/August. Whilst it may seem complicated, with different pruning required depending on the age of the plant, it is reasonably straightforward.
This link will take you to the Royal Horticultural Society’s tips:
www.rhs.org.uk/advice/profile?pid=242
There is also a video demonstration of theirs on YouTube:
www.youtube.com/watch?v=P0qDeGhEjLY