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| Category: Vine |
| Family: Acanthaceae (Acanthus¹) |
| Origin: Africa, Central (Africa) |
| Evergreen: Yes |
| Bloomtime: Year-round |
| Height: Climbing (Vine) |
| Width: Spreading |
| Exposure: Sun or Shade |
| Deer Tolerant: Yes |
| Irrigation (H2O Info): Medium Water Needs |
| Winter Hardiness: 25-30° F |
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Thunbergia alata (Black-eyed Susan) - An attractive and cheerful evergreen vine that sprawls along the ground and clambers up on anything that will support it. The twining stems will reach 6-8 feet and are covered with triangular-shaped leaves that have winged petioles and nearly year-round, but strongest from summer through fall, orange tubular flowers that have dark purple, almost black throats. This plant is often treated as an annual in areas where it is killed by temperatures much below 28° F but in near frost-free zones it can be a perennial. Plant in sun or part shade and water regularly. Thunbergia alata comes from South Africa, and though similar to its tropical African relative, the Orange Clock Vine (Thunbergia gregorii), this plant is easily disguisable by the dark-centered eye of the flower and the winged petioles. The name for the genus honors the Swedish naturalist Carl Peter Thunberg (1743-1828) who was a student of Linnaeus and spent several years botanizing the Cape of Good Hope. The specific epithet is from the Latin word 'alatus' meaning "winged" in reference to the flattened wing like growth on the leaf petioles.
The information on this page is based on our research that has been conducted in our nursery library and from online sources as well as from observations made of this plant as it grows in the nursery, in the nursery's garden, and in other gardens where it has been observed. We also incorporate comments received from others and always appreciate getting feedback of any kind from those who have additional information, particularly if this information is contrary to what we have written or includes additional cultural tips that might aid others in growing Thunbergia alata.
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