Native to (or naturalized in) Oregon:
- Deciduous vine, climbs to 25 ft [8 m] or more, twines clockwise. Leaves alternate, pinnately compound, 25-38 cm long, 13-19 leaflets, each 4-8 cm long, ovate-elliptic to ovate-oblong, acuminate, rounded at base, occasionally broad-wedge shaped, margin entire, bright green above. Flowers violet, violet-blue, sometime white, slightly fragrant, 1.5-2 cm long, in slender clusters (racemes) 20-50 cm long, flowers tend to open gradually from the base to the apex; longer bloom period but less concentrated color than W. sinensis. Fruit is a brown pod 10-15 cm long.
- Sun to part shade. Slow to establish
- Hardy to USDA Zone (4) 5 Native to Japan. Many cultivars, including doubles, and flowers that are white, pink, lavender, blue, or purple.