Evergreen Wisteria | Millettia reticulata This beautiful evergreen has a purple bloom during late Summer and early Fall. This perennial vine may be deciduous, semi-evergreen or evergreen, depending on the winter temperatures in the region. Its natural habitats include damp spots, slopes and valleys. It adapts to a variety of growing conditions and adds tropical appeal to outdoor space. USDA Hardiness Zones 9 to 11