Thunbergia alata, commonly known as Black-eyed Susan vine or Clock vine, is a species of flowering plant in the family Acanthaceae. It is native to Eastern Africa but is cultivated worldwide as an ornamental plant due to its beautiful flowers.

Here are some key features of Thunbergia alata:

1. Appearance: Thunbergia alata is a vigorous climbing plant with twining stems. It can reach a height of 6 to 8 feet (1.8 to 2.4 meters) when supported. The leaves are heart-shaped, dark green, and arranged alternately along the stems.

2. Flowers: The most distinctive feature of Thunbergia alata is its attractive flowers. They are trumpet-shaped and have a diameter of about 1 to 2 inches (2.5 to 5 centimeters). The flowers typically have a yellow-orange center, which gives rise to the common name "Black-eyed Susan." The petals are usually orange or yellow, although there are cultivars with white, cream, or pink petals. The flowers bloom profusely from late spring to fall, attracting bees, butterflies, and other pollinators.

3. Growing conditions: Thunbergia alata prefers a sunny location with well-draining soil. It is typically grown as an annual in colder regions but can be grown as a perennial in frost-free climates. It is relatively easy to grow and can be trained to climb on trellises, fences, or other supports. Regular watering and occasional fertilization can promote healthy growth and abundant flowering.

4. Uses: Thunbergia alata is primarily cultivated as an ornamental plant in gardens and landscapes. It adds vibrant color and a touch of tropical beauty to fences, walls, and pergolas. It can also be grown in containers for patios or balconies. Additionally, Thunbergia alata is sometimes used in hanging baskets or as a ground cover. The flowers are suitable for cut arrangements.

5. Care: Thunbergia alata is generally low-maintenance, but it benefits from regular pruning to control its growth and shape. Pruning also helps promote more branching and flowering. Deadheading (removing faded flowers) can encourage continuous blooming. Protecting the plant from strong winds is advisable as the vines can be somewhat delicate.