Purple Emperor' is a compact, frost hardy, evergreen shrub with upright stems bearing linear, aromatic, bright green leaves and, in summer, dense spikes of dark purple flowers tipped with large, upright, pink to purple-pink bracts.
- Position: full sun
- Soil: moderately fertile, well-drained soil
- Size: 75cm High x 75cm Spread
- Flowering period: July to September
- Hardiness: fully hardy