Rhododendron johnstoneanum

Botanical Information

FamilyEricaceae
GenusRhododendron
Speciesjohnstoneanum
SynonymsRhododendron parryae
CategoryWoody
TypeShrub (evergreen)
OriginManipur, Mizoram, north east India.

Details

USDA Hardiness Zone7a - 8
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH5 - H6
RHS Hardiness Ref.
Temperature (°C)-12 - (-15)
Temperature (°F)10 - 5
Height3 metres
Flowering PeriodMay

Description and Growing Information

ShapeSpreading.
LandscapeCity and urban courtyards and gardens, as a groundcover and in informal gardens.
PropagationBy seed, semi-hardwood cuttings, layering or grafting.
CultivationGrow under partial shade in moist but well-drained, humus-rich acidic soil.
PestsCaterpillars, aphids, vine weevil, leafhoppers, lacebugs and scales. May be susceptible to rhododendron petal blight, rhododendron bud blast, powdery mildews and silver leaf.
Notable SpecimensTrengwainton Garden, Madron, near Penzance, Cornwall, United Kingdom.
HabitatFound at elevations of 1800-3600 meters.
Bark/Stem DescriptionBristly twigs, attractive reddish brown peeling bark.
Leaf DescriptionDark green hairy leaves, broadly elliptic to elliptic, up to 10 cm long, margins usually bristly.
Flower DescriptionFunnel-campanulate, sometimes fragrant, white, cream or pale greenish-yellow, often blotched yellow or flushed pink. Truss holds 2-5 blooms.

Photographs