Cultivars
'Astonville''
This vigorous shrub to small tee grows to 4m (12ft) tall producing clusters of purplish flowers that are up to 80 mm (3⅛ in) wide and appear throughout summer. Tolerates most well drained soils but needs frost protection.

'Rosea'
This shrub has an upright habit with small flowers with radiating dark veins across the petals.