Genus: Azalea

Rhododendron

Photo/Illustration: 
Chris Curless
Azalea (Rhododendron)
roe-doe-DEN-dron
Ericaceae
Plants in this massive genus are grown mainly for their showy (sometimes fragrant) flowers, which come in numerous shapes, sizes, colors, and bloom times. The leaves, while not especially showy, offer some early or late season color and are evergreen in some species.
Noteworthy characteristics:  Generally dark, lance-shaped leaves, some with fine hairs, some with bronze coloring, and some evergreen. Single or clusters of tubular flowers in many colors. Size ranges from low mat-forming shrubs to small trees.
Care:  Grow in moist, fertile, humus-rich acidic soil (pH 4.5 to 5.5) in dappled shade. Plant shallow, as plants are surface rooted and like a mulch covering.
Propagation: 

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

Problems: 

Vine 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).

Species, varieties and clutivars for genus Rhododendron

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Golden Lights Azalea
Azalea x ‘Golden Lights’
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Imperial Princess™ Azalea
Azalea 'Moness' (Southern Indica)
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PMJ
Rhododendron
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Azalea
Rhododendron 'Admiral Semmes'
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Lavender reblooming azalea
Rhododendron Bloom-A-Thon® Lavender
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Pink reblooming azalea
Rhododendron Bloom-A-Thon® Pink
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Red reblooming azalea
Rhododendron Bloom-A-Thon® Red
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White reblooming azalea
Rhododendron Bloom-A-Thon® White
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Flame azalea
Rhododendron calendulaceum
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Florida pinxter
Rhododendron canescens
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Plumleaf azalea
Rhododendron prunifolium
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Pinkshell azalea
Rhododendron vaseyi
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Swamp azalea
Rhododendron viscosum and cvs.
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Williams rhododendron
Rhododendron williamsianum
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Royal azalea
Rho­dodendron schlippenbachii