East African twining climber with arrow-shaped leaves and continuous five-petalled flowers in orange, yellow, or cream around a dark chocolate central eye. Tender perennial usually grown as a warm-season annual.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 10–11 | −1.1 °C to 10 °C | Zones where it can be grown as an annual — not a frost-tolerance rating |
| RHS hardiness rating | H2 | 1 °C to 5 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 9 | −1 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
| Australian (ANBG) zone | Zone 4–7 | 0 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
As a tender annual, Black-eyed Susan vine doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Plant in summer containers, against trellises, and as a hanging basket plant — flowers continuously from late spring to first frost
- Fast growing — reaches 2–3 m in a single warm season
- Distinct from the perennial Rudbeckia black-eyed Susans — Thunbergia is a tender climber, Rudbeckia is a hardy daisy perennial
- Frost-tender — perennial only in zone 10 and warmer
- Not reliably hardy outdoors in Canada — Canadian zone values shown represent the system maximum and do not imply garden cultivation north of the warmest coastal pockets.
Categories
Related plants
Cross-check Black-eyed Susan vine against your zones