Thunbergia alata (Black-eyed Susan Vine)

Scientific Name

Thunbergia alata Bojer ex Sims

Common Names

Black-eyed Susan Vine


Endomelas alata

Scientific Classification

Family: Acanthaceae
Subfamily: Thunbergioideae
Section: Thunbergia


Color: Orange
Bloom Time: Summer


Thunbergia alata is a soft, perennial, climbing plant up to 8 feet (2.4 m) tall, with many twining stems. The leaves are heart or arrow shaped, softly hairy and sometimes toothed. The flowers have 5 petals and appear throughout the summer but can continue all year in warmer areas. They typically are warm orange with a characteristic dark spot in the center.

Thunbergia alata (Black-eyed Susan Vine)
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USDA hardiness zone 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).

How to Grow and Care

Plant Thunbergia seedlings outdoors after all frost danger passes or start your own seeds indoors 6 weeks before the last expected frost. With proper care the vines remain in bloom from midsummer until fall frost.

Spread 2 inches (5 cm) of compost over a well-drained garden bed that receives full morning sunlight and light afternoon shade. Site the bed near a trellis, fence or similar 5 to 8 foot (1.5 to 3.4 m) tall support. Work the compost into the top 8 inches (20 cm) of soil.

Plant the seedlings along the base of the support. Space the plants 12 inches (30 cm) apart. Plant the seedlings at the same depth they were growing at previously.

Water Thunbergia deeply once a week, providing approximately 1 inch (2.5 cm) of water during irrigation or enough to keep the top 6 inches (15 cm) of soil evenly moist. The plants require less irrigation during rainy weather, and they may require twice weekly irrigation during times of dry, hot weather… – See more at: How to Grow and Care for Thunbergia


Native to eastern Africa, and has been naturalized in other parts of the world.


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