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Products > Thunbergia alata 'Yellow'   Thunbergia alata 'Yellow' - Yellow Black-Eyed Susan Vine     [2nd Image] Habit and Cultural Information Category: Vine Family: Acanthaceae (Acanthus¹) Origin: Africa, Central (Africa) Evergreen: Yes Flower Color: Yellow 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 Thunbergia alata 'Yellow' (Yellow Black-Eyed Susan Vine) - 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, yellow 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. This plant was severely damaged except where protected under eaves at 28° F in our January 2013 freeze. 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.  Information presented on this page is based on research that we have conducted about this plant in our library and from reliable online sources. We also consider observations we have made of it the nursery's garden and in other gardens we visit as well, as well as in our nursery crops in the field. We incorporate comments that we receive from others as well and welcome getting feedback from anyone who may have additional information, particularly if they include cultural information that would aid others in growing  Thunbergia alata 'Yellow'.     [MORE INFO]