Right now many parts of this area are cloaked in a purple curtain of Wisteria. It has naturalized to the point that many people think of it as native. What most people are seeing is Wisteria sinensis (Chinese Wisteria) that has escaped cultivation. There are several truly native Wisterias, W. frutescens and W. macrostachya. Although vigourous, these native varieties are much better behaved than W. sinensis and the other common Asian species W. floribunda (Japanese Wisteria). Despite their behaviour issues, we sell the Asian species at work because these are what people think of as traditional, but we sell the W. frutescens as well. Years ago several Japanese Wisterias were planted at the garden center onto steel poles and trained as trees, and right now they are stunning, their sweet scent nearly cloying. If you are in the market, you should know that it can sometimes take the Chinese up to 7 years to bloom, but the more expensive Japanese blooms at a younger age. The American species will bloom a little later, a little less showy, but will tend to re-bloom lightly and occasionally through the summer.
Wisteria floribunda 'Texas Purple'
Wisteria floribunda 'Issai'