Rhododendron yedoense var. poukhanense

RHS Plant Profile

Korean azalea

Other common names

Korean azalea

Synonyms

Rhododendron coreanum, Rhododendron poukhanense

Shrubs

A semi-evergreen shrub, to around 1.2m high, with a spreading habit and narrow, dark green leaves that turn orange and red in autumn. Produces small clusters of two or three lilac pink, lightly fragrant flowers in mid spring

Position

Full shade, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 10–20 years
Max Spread: 1.5-2.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid

Position

Full shade Partial shade

Aspect: East–facing or North–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Ericaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Spreading branched
Potentially harmful: Harmful if eaten. Wear gloves and other protective equipment when handling. Pets (dogs, cats, rabbits, tortoises) Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Rhododendron can be evergreen or deciduous shrubs or trees, with simple leaves, sometimes with a dense colourful indumentum of hairs on the lower side, and funnel-shaped, bell-shaped or tubular flowers that may be solitary or in short racemes
Name Status: Correct
Plant Range: Japan, Korea

How to Grow

Cultivation

Grow in moist but well-drained, humus rich, acidic soil, in partial or full shade. Choose a site away from frost pockets and sheltered from strong winds. This species is often deciduous in cooler regions. mulch annually, ideally with leaf mould; plants are shallow rooting and roots should not be allow to dry out. See rhododendron cultivation for more detailed advice

Propagation

Propagate by semi-hardwood cuttings in late summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Flower borders and beds

Pruning

Minimal pruning required, see pruning group 8 (evergreens)

Pests

May be susceptible to vine weevil, rhododendron and azalea whitefly, rhododendron leafhopper, pieris lacebug, scale insects, caterpillars and aphids

Diseases

May be susceptible to Powdery mildews, honey fungus, silver leaf and Phytophthora, as well as more specific Rhododendron diseases