Plant types and subtypes: Trees & Shrubs, Shrubs, Deciduous
Light Requirements: part-sun, part-shade
Water Use: medium
Soil Moisture: moist, wet
Soil Description: acid, loam, clay, sand
Bloom Time: May, June, July, August
Bloom Color: white, pink
Leaf Color: green
Hardiness Zone: 5, 6, 7, 8, 9
Additional Tags: attracts birds, bog plant, fragrant flowers, pond margin plant, shade garden plant, stream margin plant, swamp plant, wetland plant
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Rhododendron viscosumAlso known as:
Azalea serrulata, Azalea viscosa, Rhododendron coryi, Rhododendron serrulatum
Rhododendron viscosum is a slow growing, late blooming azalea with a flowering period from June to July. Blooms are white or pinkish, with a sweet fragrance. The word viscosum, means sticky, and is a reference to the flower' characteristically sticky corolla. This is a low growing species with a loose, spreading form, that typically only reaches a height of 5'. Autumn will bring on a good show, with the foliage developing attractive shades of yellow, orange, red, and purple.
It is native to swamp margins and low lying areas of the eastern coastal plains, ranging from the Gulf coast in the south, and as far north as southern Maine. This azalea requires consistently moist soil, and can withstand seasonal to regular inundation. Best grown in acidic soil and filtered light. If grown under average garden conditions, it is recommended to maintain a few inches of mulch around the base of the plant to help retain adequate soil moisture. This species is very heat tolerant, and also quite cold hardy. Zones 5-9
Can be propagated from seed with no pretreatment required. Can also be propagated by layering or cuttings taken early in the growing season.
Swamp azalea is underutilized and difficult to find commercially. It should be considered rare, or endangered, in the northern part of it's native range.
Native Range & Classification
Recorded County Distribution: USDA data
AL, AR, CT, DC, DE, FL, GA, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OK, PA, RI, SC, TN, TX, VA, VT, WV
USDA Endangered Status:
- Endangered: ME
- Exploitably Vulnerable: NY
- Threatened: NH
|Species||Rhododendron viscosum||swamp azalea|