About
Rhododendron mucronulatum, the Korean rhododendron, is a deciduous shrub to about 2 m with an upright habit and lance-shaped, dark-green, scaly-backed leaves. Solitary, open funnel-shaped, lilac-pink or white flowers are produced before the leaves in late winter to early spring. One of the earliest deciduous rhododendrons to flower in the garden year.
About the genus
Rhododendron, one of the largest and most diverse shrub genera, includes evergreen and deciduous species and hybrids ranging from dwarf alpines to large trees, all preferring moist, well-drained, acidic soil in sheltered positions with dappled shade or full sun.
Growing conditions
SunlightFull sun, Partial shade
Soil typeClay, Loam, Sand
Soil pHAcid
Soil moistureMoist but well-drained
AspectSouth-facing, West-facing
ExposureSheltered
UK hardinessH6
Plant details
Plant typeShrubs
HabitBushy
FoliageDeciduous
Height1.5-2.5 metres
Spread1.5-2.5 metres
Time to full height10-20 years
Suggested usesCity and courtyard gardens, Cottage and informal garden
Native toE & N Asia
ToxicityHarmful 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
Care notes
CultivationGrow in moist but well-drained, humus rich, acidic soil, in sun or light shade. Choose a site away from frost pockets and sheltered from strong winds. Mulch annually, ideally with leaf mould. See rhododendron cultivation for more detailed advice
PruningPrune lightly after flowering, see pruning group 1
PropagationPropagate by seed or by semi-ripe cuttings in late summer
Pest resistanceMay be susceptible to vine weevil, rhododendron and azalea whitefly, rhododendron leafhopper, Pieris lacebug, scale insects, caterpillars and aphids
Disease resistanceMay be susceptible to powdery mildews, honey fungus, silver leaf and Phytophthora, as well as more specific Rhododendron diseases