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Cobaea scandens
Sometimes called cathedral bell, this vigorous and irrepressible vine is a native of tropical America, where it grows as a strong woody perennial. It may be grown in large pots for standing outdoors in summer, and will behave as a perennial if kept indoors in winter at about 7C (45F). In a very mild winter plants may survive and remain virtually evergreen, but they're usually grown as annuals on a wall, fence or pergola. Plants have a tropical appearance, with lush foliage and 8cm (3in) flowers with prominent stamens. Once fully open, they're sweetly fragrant.