Genus of about 100 species of annuals, evergreen perennials, including many twining climbers, and some shrubs, from tropical and S. Africa, Madagascar, and tropical Asia. Thunbergia is a climbing plant. If grown as a climber some form of support is essential - it can also be grown as a trailing plant in a hanging basket. Pinch out tips of young plants. Remove faded flowers before they produce seed to prolong flowering. Petals can be white, yellow or orange.