THUNBERGIA: An annual vine also known as Black Eyed Susan. It is a vigorous growing vine that can grow to 6’–8’ in a single season. Thunbergia are great for baskets, large containers and trellises. The bright colored flowers bloom all summer.
The black-eyed Susan vine (Thunbergia alata) is a frequent sight in hanging baskets at the garden center. This flowering vine is as easy to care for as it is charming. The flowers look daisy-like at a distance, with five overlapping, solid-colored petals surround a brownish-purple center tube. The medium green leaves are a little coarse and grow opposite one another—they can be either heart-shaped or have a lance-like arrowhead shape.
This vine is native to eastern Africa and grows as a perennial in tropical climates. It is considered an invasive species in much of the world, including in the state of Hawaii. If you live in plant hardiness zones 10 or 11 and wish to grow black-eyed Susan vine outdoors, check with local authorities to make sure it is not invasive in your area.
This fast-growing vine is best planted in the spring once the soil has warmed. It is most commonly grown as an annual and can extend to 8 feet in one growing season.
| Botanical Name | Thunbergia alata |
| Common Names | Black-eyed Susan vine, clock vine, bright eyes |
| Plant Type | Perennial flowering vine (usually grown as an annual) |
| Mature Size | 3–8 feet tall, 3–6 feet wide |
| Sun Exposure | Full sun to part shade |
| Soil Type | Rich loam, medium moisture, well-draining |
| Soil pH | 6.8 to 7.7 (slightly acidic to slightly alkaline) |
| Bloom Time | Summer to fall |
| Flower Color | YELLOW |
| Hardiness Zones | 10 to 11 (USDA) |
| Native Area | Eastern Africa |
| Toxicity | Non-toxic |
| Size | 1 Bareroot, 3 bareroot, 10 Bareroot |
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