Sub-species
subsp. rockii
This deciduous shrub grows to 2 m (6ft) tall and wide with a deeply lobed dark green leaves that are blue-green on the underside and forms a compact rounded habit.  

During spring it produces large bowl-shaped semi-double white flowers that have deep maroon markings at the base of the petals. The photographs in the gallery were taken at Wisley Gardens UK.

Cultivars
'Banksii'
This shrub is similar to the species and produces double purple red flowers that have white tips.

'Cardi Vaughan'
This shrub is similar to the species and produces semi-double Ruby purple flowers during late spring.

'Godaishu'  syn 'Five Continents'
This upright shrub produces semi-double white flowers during late spring.

'Goshazaki'
This upright shrub produces single pink flowers during late spring.

'Hanadaijin'
This upright shrub produces double violet-purple flowers during late spring.

'Hana-kiso'
This upright bushy shrub produces semi-double shell pink flowers from late spring to early summer.

'Higurashi'
This shrub produces large semi-double crimson flowers during late spring.

'Hodai'
This upright shrub forms a bushy habit and produces large double rosy red flowers.

'Jitsugetsu Nishiki'
This variable shrub produces semi-double to double bright scarlet flowers.

'Kamada-nishiki'
This shrub is similar to the species and produces double reddish mauve flowers, during late spring.

'Kumagai'
This shrub produces deep pink, double flowers that turn magenta with age.

'Mrs William Kelway'
This upright bushy shrub produces double white flowers during spring.

'Reine Elisabeth' 
This shrub produces semi-double to double stem and pink flowers that are tinged red and have petals with ruffled margins.

'Renkaku'
This upright shrub produces double white flowers with deep yellow stamens.

'Sakurajishi'
This upright shrub produces large double pink flowers with the regular cut petals during late spring.

'Shichi Fukigin'
This shrub produces bright crimson flowers with soft pink margins.

'Shunkoden'
This shrub produces semi-double rosy violet flowers, during late spring.

'Taiyo'
This shrub produces semi-double flowers that are bright red with a satin sheen of maroon on the petals.

'Yachiyo-tsubaki'
This attractive small shrub produces semi-double to double phlox pink flowers with rosy petal tips. The flowers have long petals with ruffled or fringed margins and appear over the shrub from late spring to early summer.

'Yae-zakura'
This upright shrub produces double soft pink flowers, during late spring.