Thunbergia alata: Black-Eyed Susan Vine for Cheerful Orange-Yellow Blooms

Black-Eyed Susan Vine (Thunbergia alata) is a tender perennial climber, evergreen in Zones 10+. Cheerful 1.5-inch flowers in orange and yellow cover this fast-growing vine. Blossoms have 5 petals surrounding a brownish purple center. As an annual, reaches 8 feet; as a perennial, 20 feet. Native to warm/tropical regions of Africa, Madagascar, Asia.

Growing Conditions

Moist, well-drained soil in full sun with some afternoon shade. In cooler zones, grow in warm greenhouse or treat as annual. Propagate by sowing seed over 60°F, or start indoors 6–8 weeks before last frost with heat. Watch for whiteflies, scale, spider mites on indoor plants.

Key Features at a Glance

• Height: 6–10 ft.
• Spread: 6–10 ft.
• Growth Habit: Clumping, Fast
• Light: Full Sun to Part Shade
• Moisture: Medium
• Maintenance: Moderate
• Characteristics: Self-Seeds, Showy Flowers
• Bloom Time: Early Fall, Early Summer, Fall, Late Summer, Summer
• Flower Color: Salmon, White, Yellow
• Uses: Beds, Borders, Containers, Specimen, Annual, Trellis, Cottage Garden, Herb Garden
• Type: Vines