PLANT choice and attention to pruning are two essentials of success with wisteria. When buying a plant select one that has been grafted on to an existing rootstock, rather than one grown from seed. It will be more reliable and bloom sooner.
The ones that aren’t grafted can take up to seven years before they flower, sometimes even longer.
As to pruning, in later summer each year cut back long, non-flowering shoots to five or six leaves from their base.
Then, in winter reduce these to just two buds (swellings on the stems).
A wisteria will do best in a south facing position in soil that is well nourished with potash. Be sure to avoid providing too much nitrogen, remembering that nitrogen makes leaves and potash makes flowers.
As we know, all wisterias climb but they do not all do so in the same direction. While W.floribunda climbs clockwise, W.sinensis grows anti-clockwise.
See The Visitor (09-02-11) for full story.