Rhododendron impeditum 'J. C. Williams' (Mrs J. C. Williams Rhododendron)
Botanical Information
| Family | Ericaceae |
| Genus | Rhododendron |
| Species | impeditum |
| Cultivar | 'J. C. Williams' |
| Category | Woody |
| Type | Shrub (evergreen) |
Details
| USDA Hardiness Zone | 6b - 7a |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 7 |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H6 |
| RHS Hardiness Ref. | |
| Temperature (°C) | -32 |
| Temperature (°F) | -25 |
Description and Growing Information
| Shape | Sprawling to mounding. |
| Landscape | |
| Propagation | Propagate by semi-ripe cuttings in late summer, layering in autumn or grafting in late summer or late winter |
| Cultivation | Grow in moist but well-drained, leafy, humus-rich acid soil in part shade with shelter. |
| Pests | Potential diseases include powdery mildews, rhododendron petal blight, rhododendron bud blast, silver leaf and honey fungus. Potential insects include spider mites, aphids, scale, borers, leafhoppers, caterpillars, tent caterpillars and Japanese beetles. |
| Notable Specimens | Caerhays Castle, Goran, Cornwall, United Kingdom. |
| Bark/Stem Description | Dark brown-grey, mild fissures can be found on older growth. |
| Leaf Description | Narrow leaves to 22 cm long. |
| Flower Description | Wavy-edged flowers borne in compact trusses, white with distinct red-brown spotting on the upper lobe, opening from pink buds early to mid- spring. |
Photographs
Rhododendron impeditum 'J. C. Williams', form, Caerhays Castle, Goran, Cornwall, United Kingdom.
Rhododendron impeditum 'J. C. Williams', leaf, Caerhays Castle, Goran, Cornwall, United Kingdom.
Rhododendron impeditum 'J. C. Williams', flower, Caerhays Castle, Goran, Cornwall, United Kingdom.