Swamp Azalea Rhododendron viscosum

The swamp azalea is a woody, broadleaf evergreen or deciduous shrub in the Ericaceae (blueberry) family and is native to the southern and eastern United states. The genus name derives from the Greek words rhodo, which means rose, and dendron, meaning tree.

Its common name rightfully infers a tolerance for damp, moist environments but it requires enough drainage to avoid roots in constant standing water. The swamp azalea likes part shade and can tolerate some sun. Avoid afternoon sun which can scorch the leaves.

This shrub has very fragrant, sticky, white flowers that bloom from May to July and attract hummingbirds, bees, and other pollinators.

It can be planted in naturalized landscapes with careful attention paid to its growing requirements. It grows 2 feet to 8 feet tall and about as wide. It is a spreading shrub.  Use it as a specimen in a native garden or an understory shrub in woodland planting.

Insects, Diseases, and Other Plant Problems: While these shrubs remain very popular for landscape use, many cultivars are susceptible to Phytophthora root rot—this leads to leaf loss, reduced vigor, branch dieback, and wilting. Implement good cultural practices first, such as improving drainage with organic matter or berms and avoiding overwatering or overfertilization. However, if you have a site with a history of this disease, consider planting a root rot-resistant alternative species. 

For suitable alternatives, see this video created by Charlotte Glen as part of the Plants, Pests, and Pathogens series.

 VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers" a plant identification course offered in partnership with Longwood Gardens.

More information on Rhododendron.