Tropical Asian evergreen shrub with leathery dark green leaves and dense rounded flat-topped clusters of small brilliant scarlet (or pink, yellow, orange) tubular flowers throughout the warm season.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 10–12 | −1.1 °C to 15.6 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H1c | 5 °C to 10 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 9 | −1 °C and warmer | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 4–7 | 0 °C and warmer | Plant tolerates down to this zone |
Growing notes
- Native to tropical South Asia — Indian subcontinent and adjacent Southeast Asia
- Continuous flowering in warm humid conditions — among the most reliable tropical flowering shrubs
- Demands acidic soil — chlorotic on alkaline soils, leaves yellow visibly
- Frost-tender — strictly tropical to subtropical
- 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
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