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Formosa Azalea

Rhododendron simsii

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Formosa Azalea (Rhododendron simsii) at Meadows Farms Nurseries

Formosa Azalea flowers

Formosa Azalea flowers

(Photo courtesy of NetPS Plant Finder)

Formosa Azalea (Rhododendron simsii) at Meadows Farms Nurseries

Formosa Azalea

Formosa Azalea

(Photo courtesy of NetPS Plant Finder)

Height:  6 feet

Spread:  6 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  8a


Clusters of fragrant, white, pink, or red blooms in spring; a large, spreading evergreen azalea that needs highly acidic and organic soil that is well drained

Ornamental Features

Formosa Azalea is covered in stunning clusters of fragrant pink trumpet-shaped flowers with red overtones at the ends of the branches in mid spring. It has dark green foliage which emerges light green in spring. The narrow leaves remain dark green throughout the winter. The fruit is not ornamentally significant.

Landscape Attributes

Formosa Azalea is an open multi-stemmed evergreen shrub with an upright spreading habit of growth. Its relatively coarse texture can be used to stand it apart from other landscape plants with finer foliage.

This is a relatively low maintenance shrub, and should only be pruned after flowering to avoid removing any of the current season's flowers. It has no significant negative characteristics.

Formosa Azalea is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Formosa Azalea will grow to be about 6 feet tall at maturity, with a spread of 6 feet. It tends to be a little leggy, with a typical clearance of 1 foot from the ground, and is suitable for planting under power lines. It grows at a slow rate, and under ideal conditions can be expected to live for 40 years or more.

This shrub does best in full sun to partial shade. It requires an evenly moist well-drained soil for optimal growth, but will die in standing water. It is very fussy about its soil conditions and must have rich, acidic soils to ensure success, and is subject to chlorosis (yellowing) of the leaves in alkaline soils. It is somewhat tolerant of urban pollution, and will benefit from being planted in a relatively sheltered location. Consider applying a thick mulch around the root zone in winter to protect it in exposed locations or colder microclimates. This species is not originally from North America.

Hardiness Zone Plant Height Minimum Sunlight Soil pH Preference
Accent  Massing  Garden 
Flowers  Winter Value 
Ornamental Features

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