There are many cultivars of this species contact your local nursery for available varieties.
Cultivars
'Albert Schweitzer'
This vigorous shrub has upright rounded habit and produces conical trusses are pink flowers that have red markings.

'Album'
This vigorous evergreen shrub is very cold hardy tolerating temperatures to -26.2 ºC (-20º F) and has dark green foliage.  The pale lilac buds open to a conical inflorescence of bell-shape white flowers with green markings in the throats and are up to 80 mm (3⅛ in) long.   

'Anah Kruschke'
This compact shrub has glossy green foliage and produces deep purple flowers in tight trusses during late spring. It can tolerate a cold conditions -23.3º C (-10ºF) and is commonly planted along shrub borders.

'Blue Ensign'
This small shrub grows to 2.5 m tall with the larger dark mat green leaves and produces lavender blue flowers that are blotched darker appearing in a rounded truss during late spring.

'Caroline'
This shrub grows to 2 m tall and produces fragrant pale lavender to pink flowers during mid spring.  It may be planted in slightly moist soils as it is resistant to root rot.

'Chionoides'
This broad dense shrub grows to 1.2 m tall and produces white flowers that have a yellow centre and are arranged in a domed shaped truss.

'Compactum'
This small shrub grows to 1 m tall forming a compact habit.

'Cunningham's White'
This upright shrub for the compact habit with dark green foliage and produces pink buds that open to white flowers with yellow greenish markings.  It tolerates cold conditions and is suitable for small gardens.

'Elegans'
This shrub is upright forming a dense rounded Crown and produces deep pink flowers in large trusses during late spring.

'Moonglow'
This vigorous shrub produces light pink flowers that open to white with pinkish dots in the throat and has pink anthers and stamens.

'Nova zembla'
This upright shrub produces red flowers that are tinged with lavender and tolerates cold conditions.

'Purpureum Grandiflorum'
This shrub has a moderate growth rate and produces medium and dark purple flowers during late spring.

'Vivacious'
This compact shrub produces pure red flowers during late spring and tolerates cold conditions.