Woody > Rhododendron > Rhododendron johnstoneanum > Rhododendron johnstoneanum
Rhododendron johnstoneanum
Origin: Manipur, Mizoram, north east India.
| Family |
| Ericaceae |
| Genus |
| Rhododendron |
| Species |
| johnstoneanum |
| Category |
| Woody |
| Type |
| Shrub (evergreen) |
| Synonyms |
| Rhododendron parryae |
| USDA Hardiness Zone |
| 7a - 8 |
| Canadian Hardiness Zone |
| Requires cold season protection under glass. |
| RHS Hardiness Zone |
| H5 - H6 |
| Temperature (°C) |
| -12 - (-15) |
| Temperature (°F) |
| 10 - 5 |
| Height |
| 3 metres |
Photographs
Cultivars
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Description and Growing Information
Flowering Period
| Landscape |
| City and urban courtyards and gardens, as a groundcover and in informal gardens. |
| Cultivation |
| Grow under partial shade in moist but well-drained, humus-rich acidic soil. |
| Shape |
| Spreading. |
| Pests |
| Caterpillars, aphids, vine weevil, leafhoppers, lacebugs and scales. May be susceptible to rhododendron petal blight, rhododendron bud blast, powdery mildews and silver leaf. |
| Habitat |
| Found at elevations of 1800-3600 meters. |
| Bark/Stem Description |
| Bristly twigs, attractive reddish brown peeling bark. |
| Leaf Description |
| Dark green hairy leaves, broadly elliptic to elliptic, up to 10 cm long, margins usually bristly. |
| Flower Description |
| Funnel-campanulate, sometimes fragrant, white, cream or pale greenish-yellow, often blotched yellow or flushed pink. Truss holds 2-5 blooms. |
| Notable Specimens |
| Trengwainton Garden, Madron, near Penzance, Cornwall, United Kingdom. |
| Propagation |
| By seed, semi-hardwood cuttings, layering or grafting. |
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