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The Plant Guide

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Swamp azalea

Rhododendron viscosum and cvs.

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This deciduous azalea has dark green leaves and funnel-shaped white flowers suffused with pink. The flowers have a spicy, sweet fragrance. This plant blooms very late in the season, and sporadically throughout the summer. Cultivars include 'Delaware Blue’, ‘Pink and Sweet’, 'Lemon Drop’, 'Parade’, and ‘Lollipop’.

Noteworthy CharacteristicsFound at the edge of wetlands in eastern North America.

CareGrow in moist, fertile, humus-rich acidic soil (pH 4.5 to 5.5). Thrives in damp soil in full sun. Plant shallow, as plants are surface rooted and like a mulch covering.

PropagationRoot semi-ripe cuttings in late summer or autumn. Layer in autumn.

ProblemsVine weevil, whitefly, leafhoppers, lacebugs, scale, caterpillars, aphids. Powdery mildew, rust, bud blast, leaf gall, petal blight, root rot, and chlorosis (due to insufficient soil acid).

  • Genus : Rhododendron
  • Zones : 4, 5, 6, 7, 8, 9
  • Plant Height : 6 to 10 feet
  • Plant Width : 6 to 10 feet
  • Characteristics : Fragrant Flowers
  • Light : Full Shade
  • Moisture : Medium Moisture
  • Flower Color : Pink, White
  • Plant Type : Shrubs
  • Bloom Time : Spring
  • Plant Seasonal Interest : Spring Interest
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