- Season: Annual
- USDA Zones: 3 - 10
- Height: 60 - 84 inches (vining)
- Bloom Season: Summer through fall
- Bloom Color: Orange
- Environment: Full sun
- Soil Type: Loamy, well-drained, pH 6.1 - 7.8
- Temperature: 75 - 80F
- Average Germ Time: 14 - 21 days
- Light Required: No
- Depth: 1/4 inch
- Sowing Rate: 3 seeds per plant
- Moisture: Keep seeds moist until germination
- Plant Spacing: 8 - 12 inches
- Care & Maintenance: See: Thunbergia
Thunbergia (Thunbergia Alata Sunrise Orange) - Commonly known as Black-Eyed Susan Vine, this profusely blooming climber grows from Thunbergia seeds, and it's quite an attraction in the summer garden. The orange Black Eyed Susan vine features 1 - 2 inch orange blooms, many with black eyes, against large, heart-shaped foliage. It's a fast climber, and it will adorn a rustic gate, mailbox, flagpole base, or trellis with a twining vine, lush foliage and masses of blooms. Thunbergia orange vines makes wonderful privacy screens if they are grown at the base of chain-link fencing.
Thunbergia Black Eyed Susan vine grows best in full sun. They needs average, well-drained soil. Plant seedlings 3 inches away from supports. Netting or strings make good trellis material. Solid fencing or large posts will need trellis material for the vine to climb. Space plants 8 - 12 inches apart. Pinch the tips of young Black-Eyed Susan plants to encourage branching. In areas of no frost, Thunbergia will grow as a perennial. In colder climates, grow it as an annual, sowing the Thunbergia Alata seeds each year. If grown in a container, Black-Eyed Susan plants can be wintered indoors in a bright, sunny window.
How To Grow Thunbergia From Seed: It is recommended to soak the Black-eyed Susan vine seeds over night in tepid water. Following the soaking, sow Thunbergia seeds outdoors after the last frost in prepared seed bed. Or, to get a jump start on the growing season, sow Thunbergia seeds indoors 6 - 8 weeks before outdoor planting. Thunbergia flower seeds germinate better in darkness.