Wisteria Flower Season. Planting of wisteria is best done between October and April. While some people may notice regrowth right away others may not see any growth until later in the season from June to late July.
See more about caring for wisteria from planting to pruning in. The most logical answer to your question is that you live in a cold-winter climate and the flowering buds are frozen off every year. The other possibility is that you do not know which are the flowering buds and you are inadverting pruning them off every year.
They appear in late spring or early summer along with the leaves.
The blooms appear in mid- to late spring in May or June in most places. It produces pretty hanging sprays up to 8 in. There are many species of wisteria but the two most popular are Wisteria sinensis and Wisteria floribunda. Planting of wisteria is best done between October and April.