Cultivars
'Alice'
This semi-evergreen azalea grows to 3 m tall with dark green foliage and forms a bushy habit. During spring it produces salmon red funnel-shaped flowers in clusters and grows in USDA zones 6-9.

'Carman'
This evergreen azalea grows to 300 mm tall (1 ft) tall with dark green foliage and forms a compact dwarf habit. During spring it produces red funnel-shaped flowers in clusters and grows in USDA zones 6-9.

'Charlotte'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms a bushy habit.  From the mid to late spring it produces single dark orange-red funnel-shaped flowers in clusters. It prefers a semi-shaded to full sun protected position and grows in USDA zones 6-9.

'Christina'
This semi-evergreen azalea grows to 3 m (10 ft) tall with oval-shaped dark green foliage and forms a bushy habit. From mid to late spring it produces single red funnel-shaped flowers up to 50 mm (2 in) wide in clusters of 2-4 and grows in USDA zones 6-9.

'Dorsett'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms an upright bushy habit. From late spring to autumn it produces single bright salmon red to purplish pink funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 6-9.

'Fedora'
This evergreen azalea grows to 2 m (6 ft) tall and wide with mid green foliage that turns reddish during autumn and forms a rounded bushy habit. From mid to late spring it produces single pink funnel-shaped flowers up to 50 mm (2 in) wide in clusters of 2-4 and grows in USDA zones 6-9.

'Holland'  syn. 'Holland Red'
This semi-evergreen azalea grows to 1.2 m (4 ft) tall with oval-shaped dark green foliage and forms a mounded habit. From mid to late spring it produces single large red funnel-shaped flowers up to 50 mm (2 in) wide in clusters of 2-4 and grows in USDA zones 6-9.

'Joanna'
This semi-evergreen to evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms an upright bushy habit. From mid to late spring it produces single red funnel-shaped flowers up to 50 mm (2 in) wide in clusters of 2-4 and grows in USDA zones 6-9.

'Juliana'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms a bushy habit. During mid-spring it produces deep pink funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 5-9.

'Kathleen'
This evergreen azalea grows to 2 m (6 ft) tall with dark green foliage that turns yellow during autumn and forms a bushy habit. During mid-spring it produces lightly scented single coral-white funnel-shaped flowers with a bright yellow blotch and is up to 50 mm (2 in) wide appearing in clusters of 2-4 and grows in USDA zones 5-9.

'Mary'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage that turns yellow during autumn and forms a bushy habit. During mid-spring it produces violet-red funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 6-9.

'Mikado'   syn. 'May King'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage that turns burgundy during autumn and forms an upright bushy habit. During mid-spring it produces dark red funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 6-9.

'Norma'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms a bushy habit. During mid-spring it produces violet-red funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 6-9.

'Othello'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms a bushy habit. During mid-spring it produces red funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 5-9.

'Tachisene'
This semi-evergreen azalea grows to 3 m (10 ft) tall with dark green foliage and forms a bushy habit. During mid-spring it produces small double bright salmon pink funnel-shaped flowers in clusters of 2-4 and grows in USDA zones 5-9.

'White Squall'
This semi-evergreen azalea grows to 1.2 m (4 ft) tall with dark green foliage that turns yellow during autumn and forms a bushy habit. During mid-spring it produces pure white funnel-shaped flowers with a greenish flare in clusters of 2-4 and grows in USDA zones 5-9.

Note
Rhododendron kaempferi is one of the parents of the Kurume hybrids.

The Kaempfer hybrids resulted from crossing Rhododendron kaempferi x Rhododendron 'Malvatica' x Rhododendron 'Maxwelli' and generally have a glossy lanceolate to ovate leaves up to 50 mm (2 in) long and produce 2-4 showy funnelform flowers in clusters during mid-spring. 

They prefer an open sunny to partially shaded position and grow in organic rich moist soils that are acidic with a pH 4.5-6.