Pint plant from Thunbergia alata Tangerina slice a peel. ANNUAL The bright red and orange flowers feature a bi color appearance that gives color to baskets and containers. Thunbergia can mingle on the ground and grab hold and climb taller plants near by. A fast growing vine that reaches heights of 5 to 8 feet.We recommend planting this on a trellis or a fence to give it something to climb.