Bacterial Disease
Environmental Damage
Fungal Disease
Herbicide Injury
Insect Damage
Leaf spots, powdery mildew, scale, thrips and whitefly are possible problems, but occur only occasionally.
Alkaline soils will lead to chlorosis (yellowing ) of the leaves.
| Hardiness Zone: | 5 - 7 |
| Mature Height: | 4-9 Feet |
| Mature Width: | 6-12 Feet |
| Features: | Showy flowers (color depends on cultivar selected) in late spring; flowers have no fragrance; autumn color is a very mild yellow; leaves are deciduous (shed in autumn). |
| Culture: | Partial to full shade; moist, well-drained soil is best, but will tolerate some dryness; needs acid soil. |
| Cultivars: | This species is used as a parent in many hybrids, including the Ghent Hybrids, Knapp Hill Hybrids and Ilam Hybrids. 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 5-7. '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 feet) 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: | Rounded to slightly broad rounded |
| Native To: | United States |
| Soil Conditions: |
 DryMoist, Well-DrainedWet
|
| Tolerance: |
Alkaline Soil
Dry SitesSalt
Soil Compaction
Wet Sites
Wind |
| Uses: |
Barrier
Border
Foundation
Hedge
Massing
Naturalizing
Screen
Specimen
|
| Foliage Color: |
Green |
| Fall Foliage Color: |
Yellow |
| Additional Notes: | Rhododendron and azaleas both fall into the genus Rhododendron. For more information on rhododendrons visit the American Rhododendron Society website www.rhododendron.org |
