Propagation
Surface sow fresh seeds in boxes using a sandy-peat media that is lime free and cover the seeds lightly with sphagnum or sand. Keep moist and pot up as soon as large enough to handle.

Take semi-heartwood or tip cuttings from early to late summer from 25 mm (1 in) to 200 mm (7¾ in) long. All but the top leaves should be removed and they can be reduced by half to improve aeration and reduce evapotranspiration. 

Prepare the base of the cutting by removing a slither of bark up to 25 mm (1in) long then dip the end in to hormone rooting powder that contains indolebutyric acid. Place the cuttings in a well-drained media and maintain a temperature of 21° C (70° F) and apply water misting on a regular basis. 

Take care not to over water as this will promote fungal attack. Cuttings should root up within 6-weeks or may take up to 12 months for some species.  

Cultivars may be grafted onto a rootstock.
Aerial or ground layering is carried out during the growing period.

Note:
This plant is not commonly cultivated and may be difficult to obtain requiring a specialist nursery.

Botanic information
Leaf: The leathery texture leaves are oblanceolate to oblong-elliptical within obtuse mucronate apex in the cuneate base with a petiole up to 8 mm (⅓ in) long. 

The upper surface is glossy dark green and the underside has a rusty-scaly texture. They are arranged densely towards the end of the branchlets.

Flower: The small flowers consists of a linear calyx lobes that are 3 mm (⅛ in) long and have a scaly surface with ciliate margins and the white corolla has 5-broad ovate lobes that are longer than the tube with 10-exserted stamens. 

There are 10-28 flowers with scaly pedestals up to 20 mm (¾ in) long arranged on a 25 mm (1 in) long rachis, in a terminal umbel-like raceme that appears during mid-spring.

Fruit: The small cylindrical capsule as a rusty scaly appearance and contains numerous tiny seeds. The small seeds are viable but the plant may be reproduced vegetatively.

Culture
Rhododendrons grow best in a sandy loam that is tending acidic and is well drained with a mixture of leaf mould and peat that is kept moist, and friable. They do not thrive in clay or limestone based soils with a high pH and is very sensitive to salinity. 

These shrubs require protection from strong winds due to the shallow root system and dislike hot afternoon sun, preferring a semi-shaded position.  As they are shallow rooted they are easily transplanted with a good ball of soil kept around the roots. When replanting apply a thick layer of mulch which will retain the soil moisture, improve soil aeration and decrease the penetration of frosts in cold areas. 

When planting from a container you may make vertical slits down the root ball with a sharp knife to ensure contact with the new soil and the hole once planted it should not be allowed to dry out. 

The large leaf forms tolerate a shaded position, under deciduous trees or on the southern side of buildings and the smaller azaleas can tolerate a sunny position, but all forms require adequate light for flowering.  Normally little pruning is required, but rhododendrons will tolerate cutting back if they become leggy or to rejuvenate.