General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 6b
Plant Height: 6 to 15 feet
Plant Spread: 6 to 10 feet
Leaves: Good fall color
Deciduous
Flowers: Showy
Blooms on old wood
Flower Color: Pink
Flower Time: Spring
Suitable Locations: Patio/Ornamental/Small Tree
Uses: Cut Flower
Wildlife Attractant: Bees
Propagation: Other methods: Cuttings: Tip
Layering
Other: Tissue Culture
Pollinators: Bees
Miscellaneous: Monoecious
Awards and Recognitions: RHS AGM

Image
Common names
  • Royal Azalea
  • Rhododendron

Photo Gallery
Location: Arnold Arboretum, Harvard University, Boston, Massachusetts
Date: 05/04/2017
photo by Danny Schissler via Flickr: https://www.flickr.com/photo

Date: c. 1894
illustration from 'The Garden', 1894
Location: Jenkins Arboretum in Berwyn, PA
Date: 2021-04-27
close-up of flowers
Location: Jenkins Arboretum in Berwyn, PA
Date: 2021-04-27
flowers
Location: Jenkins Arboretum in Berwyn, PA
Date: 2021-04-27
shrub in bloom
Location: Jenkins Arboretum in Berwyn, Pennsylvania
Date: 2019-06-09
full-grown plant after bloom
Location: Jenkins Arboretum in Berwyn, Pennsylvania
Date: 2019-06-09
leaves
Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jun 10, 2019 9:32 AM concerning plant:
    This Royal Azalea is native to Korea and Manchuria. It does not hybridize freely with other Deciduous Azaleas. It has sort of rounded leaves that are about 2 to 5.5 inches long and 1.5 to 3 inches wide that get a good yellow to orange to red fall color. The pale pink to rose-pink flowers in clusters of 3 to 6 together are fragrant and bloom in May as the young leaves are unfolding. It can grow in a pH range up to about 7.0, being a little more tolerant of less acid conditions. It is considered as a very lovely species. I've only seen a few planted in arboretums.

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