General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Wet
Wet Mesic
Mesic
Soil pH Preferences: Very strongly acid (4.5 – 5.0)
Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Minimum cold hardiness: Zone 4b -31.7 °C (-25 °F) to -28.9 °C (-20 °F)
Maximum recommended zone: Zone 8a
Plant Height: 6 to 12 feet, to 20 feet
Plant Spread: 6 to 12 feet, to 20 feet
Leaves: Good fall color
Deciduous
Flowers: Showy
Fragrant
Blooms on old wood
Flower Color: White
Flower Time: Spring
Late spring or early summer
Suitable Locations: Bog gardening
Uses: Cut Flower
Will Naturalize
Wildlife Attractant: Bees
Resistances: Flood Resistant
Propagation: Other methods: Cuttings: Tip
Layering
Other: Tissue Culture
Pollinators: Moths and Butterflies
Bumblebees
Bees
Miscellaneous: Monoecious
Awards and Recognitions: RHS AGM

Image
Common names
  • Sweet Azalea
  • Rhododendron
  • Smooth Azalea

Photo Gallery
Location: Washington DC area
Date: 06/03/2013
photo by Fritz Flohr Reynolds via Flickr: https://www.flickr.com/

Date: c. 1835
illustration by m. Sorensen from Addisonia, November 1935
Location: Tennessee
courtesy Sunlight Gardens, www.sunlightgardens.com
Location: Ambler Arboretum in Ambler, PA
Date: 2017-06-14
white flowers and foliage
Location: Botanischer Garten der Universitaet Oldenburg
Date: 2016-10-09
Location: Ambler Arboretum in Ambler, PA
Date: 2014-06-22
shrub in summer in bloom
Location: Ambler Arboretum in Ambler, PA
Date: 2017-06-14
shrub in bloom
Location: Jenkins Arboretum in Berwyn, Pennsylvania
Date: 2012-06-10
shrub in woods
Location: Jenkins Arboretum in Berwyn, Pennsylvania
Date: 2014-10-26
shrub in autumn
Location: Botanischer Garten der Universitaet Oldenburg
Date: 2016-10-09
Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jan 23, 2018 7:46 PM concerning plant:
    This native species is found in the wild in swamps, along the banks of watercourses, in cool mountain meadows, and upland mesic woods in some spots in New England, in Pennsylvania, in West Virginia, in Virginia, eastern Kentucky & Tennessee, central to western North Carolina, western South Carolina, and northern Georgia & Alabama. It does need protection from strong sun and winds and is sensitive to soil compaction, drought, and salt. It has funnel-shaped bell flowers about 1.5 to 2 inches long that are pure white or tinged with pink in June and very fragrant. It is sold by some large, diverse nurseries, native plant nurseries, and mail order nurseries. This handsome species that is not real flashy is not commonly planted, too bad. These deciduous azaleas are sort of expensive plants. Of course, like other azaleas, it does best in the East and is usually hard to grow in most of the Midwest.
  • Posted by SongofJoy (Clarksville, TN - Zone 6b) on Jan 15, 2012 6:52 AM concerning plant:
    Sweet Azalea is named for its highly fragrant early summer flowers which are white to pale pink with red stamens. It is erect, loosely branched, and native to stream banks and swamp and bog edges of the southeast. As such, it prefers evenly moist acidic soil in sun to light shade. Sweet Azalea is tall and fast growing, and fall foliage color may be a good red. The plant is good for damp areas.

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