Photo by Melody

PlantFiles: Swamp Azalea, Swamp Honeysuckle, Clammy Azalea
Rhododendron viscosum

Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Species: viscosum (vis-KOH-sum) (Info)

Synonym:Azalea serrulata
Synonym:Azalea viscosa
Synonym:Rhododendron coryi
Synonym:Rhododendron serrulatum
Synonym:Rhododendron viscosum var. glaucum

» View all varieties of Azaleas and Rhododendrons

6 vendors have this plant for sale.

7 members have or want this plant for trade.


4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)

4-6 ft. (1.2-1.8 m)

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)

Sun Exposure:
Light Shade

Parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow
White/Near White

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer


Other details:
Flowers are fragrant
Requires consistently moist soil; do not let dry out between waterings

Patent Information:

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

Click thumbnail
to view:

By lilwren
Thumbnail #1 of Rhododendron viscosum by lilwren

By claypa
Thumbnail #2 of Rhododendron viscosum by claypa

By claypa
Thumbnail #3 of Rhododendron viscosum by claypa

By claypa
Thumbnail #4 of Rhododendron viscosum by claypa

By baccharis
Thumbnail #5 of Rhododendron viscosum by baccharis

By claypa
Thumbnail #6 of Rhododendron viscosum by claypa

By Rickwebb
Thumbnail #7 of Rhododendron viscosum by Rickwebb

There are a total of 8 photos.
Click here to view them all!


3 positives
1 neutral
No negatives

Gardeners' Notes:

Positive coriaceous On Dec 30, 2014, coriaceous from ROSLINDALE, MA wrote:

This is one of the latest of our native deciduous azaleas to bloom, in early July here (Boston Z6a). Flowers are usually white, rarely pink, yellow in one cultivar, and have a strong clove scent.

In the wild this grows in wet lowlands and swamps. It is very sensitive to drought. All azaleas/rhododendrons have shallow roots that appreciate mulching for moisture retention in the garden, but that goes double for this species. This is a great shrub for natural woodlands. Like other azaleas, it needs acid soil.

Positive SoooSirius On Jan 13, 2014, SoooSirius from Municipality of Murrysville, PA wrote:

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

Neutral Cordeledawg On Apr 12, 2008, Cordeledawg from Cordele, GA (Zone 8a) wrote:

I recently purchased R. viscosum 'Summer Eyelet' which blooms later than most native azaleas, June/July. I'm trying to decide where to plant this one. It needs to stay moist.

Positive struckcheon On Jun 11, 2006, struckcheon from Closter, NJ wrote:

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


This plant has been said to grow in the following regions:

Cordele, Georgia
Marietta, Georgia
Coushatta, Louisiana
Pasadena, Maryland
Granville, Massachusetts
Mashpee, Massachusetts
Roslindale, Massachusetts
Closter, New Jersey
Murrysville, Pennsylvania
Pottstown, Pennsylvania
West Chester, Pennsylvania
Conway, South Carolina

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America