University of Illinois Extension
University of Illinois Extension - Selecting Shrubs for Your Home
http://www.urbanext.uiuc.edu/shrubselector
Korean Rhododendron
Rhododendron mucronulatum
Hardiness Zone: 5 - 7 
Mature Height: 3-6 Feet
Mature Width: 3-6 Feet
Features: Showy light purple to rosy pink flowers in early to mid spring; leaves are deciduous (shed in autumn), but they turn yellow and bronze before falling.
Culture: Partial to full shade; moist, well-drained soil is best; needs acid soil.
Cultivars:
  • 'Cornell Pink'- Pink flowers.
  • 'Crater's Edge' - Dark red buds opening to lavender pink flowers.

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 zone 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 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. Hardy zone 5 to 7.

Mature Form: Oval to rounded
Native To: China, Korea and Japan
Soil Conditions:
Dry
Soil condition: Moist, Well-DrainedMoist, Well-Drained
Wet
Tolerance:
Alkaline Soil
Dry Sites
Salt
Soil Compaction
Wet Sites
Wind
Uses:
Barrier
Use for: Border.Border
Use for: Foundation.Foundation
Hedge
Massing
Naturalizing
Screen
Use for: Specimen.Specimen
Foliage Color: Green
 
Fall Foliage Color: Yellow
 
Additional Notes: Alkaline soils will lead to chlorosis (yellowing) of the leaves.

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