Wisteria is a genus with around 10 deciduous, woody-stemmed vine species. They are grown for their dramatic and fragrant pea-shaped, scented purple flowers and their twining, climbing habit. They are popular in cottage gardens and usually trained up walls, buildings, trees or pergolas where they are supported, and their beautiful flowers may hang freely. These are arranged in clusters on unbranched stems called racemes. Originally from China, Japan, Korea and the USA, this genus has been developed by botanists, with attractive white, pink and blue flowers commercially available.