Thunbergia is better known as Black-eyed Susan vine. This attractive and fast-growing climbing plant originates from South Africa and is easy to grow in temperate climates. It can also be grown indoors year-round as a houseplant. In the garden, it is a popular and eye-catching annual climber that can reach a height of 2 to 3 metres. Provide this vigorous climber with support such as a fence, wall, trellis or pergola. Thunbergia flowers from June through October.