Sub-species
subsp.  japonicum
This evergreen shrub grows to 1.5 m (5 ft) tall and produces red or bright yellow flowers during spring. It is naturally found from northern Kyushu to south-west Hokkaido from 1000 m to 2100 m (6,300 ft). 

Cultivars
There are many cultivars derived from this species and it is advisable to contact your local nursery for available varieties.

'Brilliant Red'
This spreading shrub grows to 1.5 m (5 ft) tall by 4 m (12 ft) wide and produces carmine red funnel-shaped flowers in clusters during mid-spring. It prefers a semi-shaded to sunny position and grows in well-drained fertile moist soils that are tending acidic.

'Sunte Nectarine'
This upright and spreading shrub grows to 2 m (6 ft) tall by 4 m (12 ft) wide and produces orange funnel-shaped flowers in clusters during mid-spring. It prefers a semi-shaded to sunny position and grows in well-drained fertile moist soils that are tending acidic.

'Mrs L J Endtz'
This spreading shrub grows to 1.5 m (5 ft) tall by 4 m (12 ft) wide and produces yellow funnel-shaped flowers in clusters during mid-spring. It prefers a semi-shaded to sunny position and grows in well-drained fertile moist soils that are tending acidic.