Genus: Thunbergia


Michael Dirr
The genus Thunbergia includes 100 or so species of annuals, evergreen perennials, twining climbers, and shrubs from Africa, Madagascar, and Asia. Their showy, often tropical-looking flowers are trumpet shaped with spreading lobes, blooming mainly in summer. Use in a greenhouse where not hardy or outdoors as annuals in a sheltered site. In warmer areas, grow the shrubby and perennial species in borders, and the climbers on an arch, pergola, or tree.
Noteworthy characteristics:  Showy blue, yellow, orange, red, or white flowers with spreading lobes.
Care:  In the garden, grow in moist but well-drained, fertile soil in full sun. Prune climbers in early spring. Tropical climbers need partial shade. Under glass, grow in full light with shelter from hot sun. Water freely during growth and sparingly in winter.  

Sow seed at 61° to 64°F in spring. Using bottom heat, insert greenwood cuttings in early summer or semi-ripe cuttings in mid- or late summer. Plants may also be layered in spring.

Species, varieties and clutivars for genus Thunbergia

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Black-eyed Susan vine
Thunbergia alata

Indoors, spider mites, whiteflies, and scale insects may be problems.