Cultivars
'Robert Bloom'
The perennial has pink flowers with orange-brown centres otherwise it is simular to the species.

'Ruby Giant' 
This large form produces red-purple fragrant flowers that are long lasting and have a double row of horizontal petals. The plant grows to 500mm (20in) tall by 600mm (2ft) wide in a sunny to semi shaded position. Once established it has a medium water requirement, (Scale: 2-drops from 3) and responds to mulching with an occasional deep watering during dry periods.

'White Swan'
This perennial has large white flowers with orange-brown centres.