Wisteria floribunda ''Royal Purple'' (Japanese Wisteria)
Among the darkest purple Wisteria cultivars, awardwinning Wisteria floribunda ''Royal Purple'' (Japanese Wisteria) produces stunning tresses of sweetly scented, pealike violet flowers, up to 20 in. long (50 cm). Blooming in late spring or early summer, the flowers are followed by attractive, beanlike pods, which ripen in late summer and may persist into winter.