Bacterial Disease
Environmental Damage
Fungal Disease
Herbicide Injury
Insect Damage
A number of diseases and insects can attack this species; the most serious are black vine weevil, borers, leaf blights and spots.
Alkaline soil will lead to chlorosis (yellowing) of the leaves; winter sun and wind can be damaging to the evergreen foliage.
| Hardiness Zone: | 4 - 7 |
| Mature Height: | 6-12 Feet |
| Mature Width: | 6-12 Feet |
| Features: | Large clusters of flowers (color depends on cultivar selected) in late spring; leaves are evergreen and leathery. |
| Culture: | Partial to full shade; moist, well drained soil is best; needs acid soil. |
| Cultivars: | Incredible number of cultivars available. Check local nurseries for cultivars available in your area. Common Groups of Hybrid Rhododendrons 'Girard' Hybrids: This large group of azaleas includes both deciduous and evergreen cultivars. They vary in flower color and winter hardiness. 'Knapp Hill' Hybrids: The result of crosssing several species of Rhododendron. A large group including 'Knapp Hill', 'Exbury', 'Slocock' and 'Ilam' Hybrids. These azaleas are deciduous. Flower color depends on the cultivar selected. Mildew can be a problem with this group. Hardiness zones 5 to 7. 'Northern Lights' Hybrids: Developed at University of Minnesota. These hybrids were selected for excellent cold hardiness (to -30 degrees). These azaleas are deciduous. Flower color depends on cultivar selected. 'P.J.M.' Hybrids:A group of hybrids that are known for their compact size (3-6 ffet) and their flower color (shades of lavender pink to mauve). These rhododendrons are evergreen, with the foliage taking on a purplish cast in winter. Hardiness zones 5 to 7. |
| Mature Form: | Usually rounded, but can become more upright and leggy. |
| Native To: | United States |
| Soil Conditions: |
Dry
 Moist, Well-DrainedWet
|
| Tolerance: |
Alkaline Soil
Dry Sites
Salt
Soil Compaction
Wet Sites
Wind
|
| Uses: |
Barrier
Border
Foundation
Hedge
Massing
Naturalizing
Screen
Specimen
|
| Foliage Color: |
Green |
| Fall Foliage Color: |
Green |
| Additional Notes: | For more information on rhododendrons, visit the American Rhododendron Society website at www.rhododendron.org. |
