Rhododendron Species, Swamp Azalea, Swamp Honeysuckle, Clammy Azalea

Rhododendronviscosum

Family
Ericaceae (er-ek-AY-see-ee)
Genus
Rhododendron (roh-do-DEN-dron)
Species
viscosum (vis-KOH-sum)
Synonym
Spacing
4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
Hardiness
4-6 ft. (1.2-1.8 m)
Sun Exposure
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
Danger
Light Shade
Bloom Color
Parts of plant are poisonous if ingested
Bloom Time
Pink
Bright Yellow
White/Near White
Foliage
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Other Details
Other details
Deciduous
Seed Collecting
Category
From semi-hardwood cuttings
From hardwood cuttings
By stooling or mound layering
Patent Information
Foliage Color
Allow pods to dry on plant; break open to collect seeds
Bloom Characteristics
Water Requirements
Where to Grow
Regional

This plant is said to grow outdoors in the following regions:

Cordele, Georgia

Marietta, Georgia

Coushatta, Louisiana

Buckfield, Maine

Pasadena, Maryland

Granville, Massachusetts

Mashpee, Massachusetts

Roslindale, Massachusetts

Weymouth, Massachusetts

Closter, New Jersey

Murrysville, Pennsylvania

Pottstown, Pennsylvania

West Chester, Pennsylvania

Conway, South Carolina

Easley, South Carolina

Wilder, Vermont

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Gardener's Notes:

4
positives
1
neutral
0
negative
Sort By:
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N
SOUTH WEYMOUTH, MA | March 2018 | positive

The scent alone is reason enough to grow this azalea. I have found them hard to get started but once growing they are very robust. Lovely...Read More

C
ROSLINDALE, MA | December 2014 | positive

This is one of the latest of our native deciduous azaleas to bloom, in early July here (Boston Z6a). Flowers are usually white, rarely pi...Read More

S
Municipality of Murrysville, PA | January 2014 | positive

Very fragrant, and yes, the stems and buds are sticky. (viscosum)

C
Cordele, GA (Zone 8a) | April 2008 | neutral

I recently purchased R. viscosum 'Summer Eyelet' which blooms later than most native azaleas, June/July. I'm trying to decide where to p...Read More

S
Closter, NJ | June 2006 | positive

Got some this year. Flowers are a beautiful white, very nice form, and they are indeed fragrant. Good for a partially shaded, moist location.

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