Thunbergia is a genus of flowering vines and shrubs that contains more than 200 species. Native to tropical Africa and Asia, the two most commonly grown species in the U.S. are the Black-Eyed Susan vine (Thunbergia alata) and the trumpet vine (Thunbergia grandiflora), which is considered invasive in Hawaii and Australia. With morning glory-like flowers, these vines thrive in warm weather and quickly cover arbors and other support structures. Hardy to USDA zones 8 through 11, plant thunbergia in an area that provides afternoon shade.
Pour a 3-inch layer of well-rotted manure onto the planting bed. Mix it to a depth of 6 inches with a gardening fork. Rake the soil until it is level.
Dig a hole that is twice the width and the same depth as the nursery pot in which the thunbergia is growing. Tip the pot on its side and slide the plant from it.
Place the thunbergia's roots into the planting hole. Fill the hole with soil. Pat the soil gently around the base of the plant to remove air pockets.
Install a support structure, such as a trellis or arbor, for the thunbergia, or plant near a fence or wall. Install the trellis 6 inches from the thunbergia. Pound it 1 foot into the soil. Tie the thunbergia loosely to the trellis.
Water the thunbergia to a depth of 6 inches. Keep the soil moist, not saturated, while the plant becomes established.
Spread a 3- to 4-inch layer of mulch around the base of the thunbergia. Place the mulch in a 1-foot diameter around the plant.