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Mount St. Helens Azalea

Rhododendron 'Mount St. Helens'

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Mount St. Helens Azalea (Rhododendron 'Mount St. Helens') at Chalet Nursery

Mount St. Helens Azalea flowers

Mount St. Helens Azalea flowers

(Photo courtesy of NetPS Plant Finder)

Height:  6 feet

Spread:  6 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4

Other Names:  Mount Saint Helens, Mt. Saint Helens

Group/Class:  Girard Hybrids


This beautiful hybrid is open and airy with buds that are coral red as they open; the blooms are pink and coral with a yellow blotch in a cluster; absolutely must have well-drained, highly acidic and organic soil

Ornamental Features

Mount St. Helens Azalea is covered in stunning clusters of lightly-scented pink trumpet-shaped flowers with coral-pink overtones and a yellow blotch at the ends of the branches in mid spring before the leaves. It has green foliage throughout the season. The narrow leaves do not develop any appreciable fall color. The fruit is not ornamentally significant.

Landscape Attributes

Mount St. Helens Azalea is an open multi-stemmed deciduous shrub with a mounded form. 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.

Mount St. Helens Azalea is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Mount St. Helens 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 particular variety is an interspecific hybrid.

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