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Grow Thunbergia seeds for this incredible climber! Commonly called Black-Eyed Susan vine, this tender perennial is evergreen in zones 10 and warmer, and where it is grown as a perennial, it can reach heights of 20 feet. In cooler areas where there are winter frosts, grow Thunbergia vine as an annual, sowing the Thunbergia seeds each spring. This vine brightly displays 1 1/2 inch flowers in multicolor blooms of yellow, white and orange. The simple blooms have 5 petals and surround a brownish purple center. The lush foliage and profuse blooming make this a rewarding plant to grow in any summer landscape.