Rhododendron prunifolium

Plumleaf azalea is a large, woody, broadleaf evergreen or deciduous shrub in the Ericaceae (blueberry) family. It is native to Alabama and Georgia and does well in the South. Growing 8 to 12 feet tall and 6 to 8 feet wide, it has an erect, spreading, and open habit. The genus name derives from the Greek words rhodo, which means rose, and dendron, meaning tree.

This azalea prefers a cool, shady site, but can be grown in partial shade where it will be protected from afternoon sun. It prefers moist, well-drained, acidic soils and does not tolerate dense clay. If you have clay soil, amend with organic material, because the roots may rot if soil does not drain well. Plant the root ball high in the soil to help with drainage issues. Avoid overwatering and over-fertilizing. Pruning, if desired, may be done after flowering. 

If you have the space, grow this late summer bloomer as a specimen in a pollinator garden where it will attract bees, hummingbirds, and other pollinators. Otherwise, it does well in a naturalized or woodland area.

Insects, Diseases, and Other Plant Problems:  Insect problems include aphids, borers, lace bugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips, and whitefly. Diseases include canker, crown rot, root rot, leaf spot, rust, and powdery mildew. This plant is frequently damaged by deer. 

While rhododendrons 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. 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.