Alphabetical Plant Listing

Rhododendron arborescens (Sweet Azalea)

Sweet Azalea, Smooth Azalea, Azalea arborescens, Rhododendron 'Arborescens', Deciduous Azalea, Late Season Rhododendron, Very Late Season Rhododendron


Noted for its strongly-scented flowers and attractive fall foliage, Rhododendron arborescens, commonly known as Sweet Azalea or Smooth Azalea, is a very appealing native to eastern North America. This large, deciduous shrub bears funnel-shaped, white flowers, up to 2 in. wide (5 cm), often tinged pink, with protruding red stamens that extend elegantly beyond the petals. Held in small clusters of 3-7 flowers, they bloom profusely in early to midsummer and exude a strong perfume of heliotrope. The foliage of elliptic, glossy green leaves turns deep red to purple in fall, for a memorable display. Cold hardy, this late season Azalea can withstand temperatures as low as to -15°F ( -26°C). A wonderful landscape plant, Sweet Azalea is prized for its late, showy white flowers with their red stamens and stigma, and their marvelous fragrance.

  • May be the tallest and fastest growing of the US native Azaleas, Sweet Azalea grows up to 5-6 ft. tall and wide (150-180 cm). 
  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society
  • A sun to part shade lover, this plant is easily grown in moist, acidic, humusywell-drained soils. Plant shallowly in a location protected from strong winter winds. Protect from frost to prevent damage to flowers. Mulch annually with leaf mould to retain moisture, control weeds, and cool the soil.
  • Perfect for shrub borders or mixed borders and shade gardens.
  • Attracts butterflies, hummingbirds and birds
  • Removing spent flowers promotes new growth.
  • All parts of plant are poisonous if ingested

Learn How To Plant And Care for Your Azalea or Rhododendron

Azaleas and Rhododendrons are not difficult to grow but have special cultural requirements.Read More

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Requirements

Hardiness 5 – 9
Heat Zones 4 – 9
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Shrubs
Plant Family Azaleas - Rhododendrons, Rhododendrons - Azaleas
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid)
Fall
Height 5' – 6' (150cm – 180cm)
Spread 5' – 6' (150cm – 180cm)
Spacing 60" – 72" (150cm – 180cm)
Water Needs Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid
Soil Drainage Moist but Well-Drained
Characteristics Fragrant, Plant of Merit, Showy
Tolerance Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders
Garden Styles Informal and Cottage, Traditional Garden

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Great Plant Combination Ideas with Azaleas - Rhododendrons

Guides with Azaleas - Rhododendrons

Great Plant Combination Ideas with Rhododendrons - Azaleas

Guides with Rhododendrons - Azaleas


Photo courtesy of Natural Landscapes Nursery

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 5 – 9
Heat Zones 4 – 9
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Shrubs
Plant Family Azaleas - Rhododendrons, Rhododendrons - Azaleas
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid)
Fall
Height 5' – 6' (150cm – 180cm)
Spread 5' – 6' (150cm – 180cm)
Spacing 60" – 72" (150cm – 180cm)
Water Needs Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid
Soil Drainage Moist but Well-Drained
Characteristics Fragrant, Plant of Merit, Showy
Tolerance Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders
Garden Styles Informal and Cottage, Traditional Garden

Great Plant Combination Ideas with Azaleas - Rhododendrons

Guides with Azaleas - Rhododendrons

Great Plant Combination Ideas with Rhododendrons - Azaleas

Guides with Rhododendrons - Azaleas

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