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Mollis Azalea

Rhododendron x kosteranum

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Mollis Azalea (Rhododendron x kosteranum) at Landsburg Landscape Nursery

Rhododendron x kosteranum flowers

Rhododendron x kosteranum flowers

(Photo courtesy of NetPS Plant Finder)

Mollis Azalea (Rhododendron x kosteranum) at Landsburg Landscape Nursery

Rhododendron x kosteranum in bloom

Rhododendron x kosteranum in bloom

(Photo courtesy of NetPS Plant Finder)

Height:  5 feet

Spread:  5 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4

Description:

A hardy group of deciduous azaleas with exceptionally beautiful flowers in spring before the leaves, compact upright habit; many varieties available; absolutely must have well-drained, highly acidic and organic soil, use plenty of peat moss when planting

Ornamental Features

Mollis Azalea is blanketed in stunning clusters of lightly-scented lilac purple trumpet-shaped flowers with lavender overtones at the ends of the branches in mid spring, which emerge from distinctive rose flower buds before the leaves. It has green foliage throughout the season. The narrow leaves turn an outstanding orange in the fall. The fruit is not ornamentally significant.

Landscape Attributes

Mollis Azalea is an open multi-stemmed deciduous shrub with a more or less rounded 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.

Mollis Azalea is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Mollis Azalea will grow to be about 5 feet tall at maturity, with a spread of 5 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
Characteristics
Accent  Massing  Garden 
Applications
Flowers  Fall Color 
Ornamental Features