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Products > Thunbergia alata
 
Thunbergia alata - Black-eyed Susan
   

 
Habit and Cultural Information
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
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.  This description is based on our research and observations made of this plant as it grows in our nursery, in the nursery garden and in other gardens that we have visited. We will also incorporate comments received from others and always appreciate getting feedback of any kind from those who have some additional information about this plant, in particular if this information is contrary to what we have written or if they have additional cultural tips that would aid others in growing Thunbergia alata.
 
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