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.|
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|
|Fall Foliage Color:||
|Additional Notes:||For more information on rhododendrons, visit the American Rhododendron Society website at www.rhododendron.org.|