About
Rhododendron russatum, the purplish-blue rhododendron, is a small evergreen shrub to 1.2 m with aromatic, dark-green, brown-scaled leaves to 4 cm. In mid to late spring it produces dense clusters of intensely blue-purple flowers 2.5 cm across with a pale centre � one of the deepest-coloured of all dwarf rhododendrons. An outstanding plant for a sheltered, moist, acidic rock garden or peat bed.
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
AspectWest-facing, South-facing, East-facing
ExposureSheltered
UK hardinessH6
Plant details
Plant typeShrubs
HabitBushy
FoliageEvergreen
Height1-1.5 metres
Spread1-1.5 metres
Time to full height5-10 years
Suggested usesCity and courtyard gardens, Cottage and informal garden
Native toSW China
FragranceFoliage
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, leafy, humus-rich acid soil in part shade with shelter, suitable for full sun; see rhododendron cultivation
PruningPruning group 8
PropagationPropagate by seed when ripe, or semi-ripe cuttings in late summer, layering in autumn or grafting in late summer or late winter
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 various Rhododendron diseases including powdery mildews, rhododendron petal blight, rhododendron bud blast, silver leaf and honey fungus