Large leaves are cordate. Half hardy to zone 5 - no severe cold. Large tree to 100' with broad ovate leaves to 2'. Hardy to 10F. Small seeds. They are grown mainly for their abundance of colorful flowering.
Roots become tuberous with age.
Flowering begins white and changes to pink and then to purple. Thick stemmed vines. Leaves deeply 3 lobed - numerous small 5 angled flowers in brilliant shades from orange to red and finally to creamy yellow. Extremely popular blue flowering vine seen often on trellis and inter mixed with hedge. Its one of the best know varieties seen growing in northern zones in the summertime.