Swamp Azalea Plant Care
Rhododendron viscosum (L.) Torr.
Rhododendron viscosum, the swamp azalea, clammy azalea or swamp honeysuckle, is a species of flowering plant in the heath family Ericaceae. A deciduous shrub, it grows to 2.5 m (8.2 ft) tall and broad.
Every 7–14 days
Partial shade to full sun
40–70°F
40–60%
What Is the Swamp Azalea?
Swamp Azalea (Rhododendron viscosum) belongs to the Ericaceae family within the Rhododendron genus. Swamp Azalea is native to the eastern United States.
Swamp Azalea displays an upright, spreading shrub growth habit, reaching up to 6 inches tall with a spread of approximately 6 inches. Swamp Azalea produces showy clusters of large, colorful blooms in various shades.
Leaf size: approximately 6 inches.
How Often Should You Water a Swamp Azalea?
Rhododendron viscosum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Swamp Azalea Need?
Swamp Azalea thrives in partial shade to full sun light conditions. The optimal light range is 1000–3000 lux. Avoid placing Swamp Azalea in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial shade to full sun
1000–3000 lux
What Temperature and Humidity Does the Swamp Azalea Prefer?
Rhododendron viscosum grows best at temperatures between 40°F and 70°F. Swamp Azalea prefers humidity levels of 40–60%.
Temperature
40–70°F
Humidity
40–60%
What Soil Mix Works Best for a Swamp Azalea?
Well-draining, acidic soil with high organic matter content such as peat moss, pine bark, and perlite. Good drainage is essential for Swamp Azalea to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Swamp Azalea?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Swamp Azalea?
Swamp Azalea can be propagated through stem cuttings, layering, grafting. Similar propagation techniques also apply to rhododendron plant care, which shares the same genus.
Fertilizing
Every 6 months
During the growing season
Is the Swamp Azalea Toxic to Pets and Children?
Toxic to Pets & Children
Toxic to humans and pets if ingested
What Pests and Diseases Affect the Swamp Azalea?
Swamp Azalea is susceptible to aphids, lace bugs, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
What USDA Hardiness Zone Does the Swamp Azalea Need?
Swamp Azalea grows outdoors in USDA Zone 11a. Native to the eastern United States, Swamp Azalea is adapted to warm climates. In cooler regions, grow Swamp Azalea as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 11a
Keep exploring plants
Swamp Azalea is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Rhododendron genus — compare its care with other Rhododendron species on PlantoScan.
Swamp Azalea tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
More Rhododendron Species
Other Rhododendron species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
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