Rhododendron austrinum (Small) Rehder
Orange Azalea, Florida Azalea, Yellow Azalea
Ericaceae (Heath Family)
Synonym(s): Azalea austrina
USDA Symbol: RHAU
Orange azalea usually grows 8-10 ft. high and forms a rather loose, multi-stemmed shrub. Twigs are reddish-brown in the winter. The fragrant, yellow, orange or almost pure red flowers occur 8-15 together. Flowers are tubular in shape with protruding stamens and open before or with the leaves.
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Plant CharacteristicsDuration: Perennial
Leaf Retention: Deciduous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Breeding System: Flowers Bisexual
Fruit Type: Capsule
Size Notes: Up to about 15 feet tall, often shorter.
Bloom InformationBloom Color: White , Red , Orange , Yellow
Bloom Time: Mar , Apr , May
DistributionUSA: AL , FL , GA , MS , NC
Native Distribution: FL Panhandle, s.w. GA & MS
Native Habitat: Wooded bluffs; woodland stream banks
Growing ConditionsLight Requirement: Part Shade
Soil Moisture: Dry
Soil pH: Acidic (pH<6.8)
Soil Description: Well-drained, sandy soil.
Conditions Comments: One of the easiest native rhododendrons to grow, requiring no special pampering.
Value to Beneficial InsectsSpecial Value to Bumble Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
PropagationDescription: Combine seeds loosely with sphagnum moss and sprinkle lightly over a 2:1 perlite/peat mixture. Optimum temperatures for germination are 45-50 degrees. Transplant seedlings to acid soil with a high content of organic matter. Cultivated evergreen azaleas
Seed Treatment: No pretreatment is necessary.
Commercially Avail: yes
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Delaware Nature Society - Hockessin, DE
Crosby Arboretum - Picayune, MS
First United Methodist Church of Jefferson City - Jefferson City, TN
Mt. Cuba Center - Hockessin, DE
BibliographyBibref 1620 - Gardening with Native Plants of the South (Reprint Edition) (2009) Wasowski, S. with A. Wasowski
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Web ReferenceWebref 57 - Atlas of Florida Plants (2020) Institute for Systematic Botany
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Research LiteratureReslit 251 - Genetic diversity of seven deciduous azalea species (Rhododendron spp. section Pentanthera) native to the eastern United States (2008) M. Chappell, C. Robacker and T. M. Jenkins
Reslit 271 - Influence of nitrate: Ammonium ratios on growth and elemental concentration in two azalea cultivars (2003) M. B. Clark, H. A. Mills, C. D. Robacker and J. G....
This information was provided by the Florida WIldflower Foundation.
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Additional resourcesUSDA: Find Rhododendron austrinum in USDA Plants
FNA: Find Rhododendron austrinum in the Flora of North America (if available)
Google: Search Google for Rhododendron austrinum
MetadataRecord Modified: 2022-10-20
Research By: TWC Staff