Johanna Azalea

Rhododendron 'Johanna'

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Johanna Azalea (Rhododendron 'Johanna') at Bayport Flower Houses

Johanna Azalea flowers

Johanna Azalea flowers

(Photo courtesy of NetPS Plant Finder)

Johanna Azalea (Rhododendron 'Johanna') at Bayport Flower Houses

Johanna Azalea flowers

Johanna Azalea flowers

(Photo courtesy of NetPS Plant Finder)

Height:  4 feet

Spread:  5 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  5b


A stunning variety with extraordinary carmine-red blooms that cover the branches in spring; glossy green foliage turns deep red-purple in fall; absolutely must have well-drained, highly acidic and organic soil, use plenty of peat moss when planting

Ornamental Features

Johanna Azalea is covered in stunning clusters of red trumpet-shaped flowers at the ends of the branches from mid to late spring. It has dark green deciduous foliage which emerges chartreuse in spring. The glossy narrow leaves turn an outstanding red in the fall.

Landscape Attributes

Johanna Azalea is an open multi-stemmed deciduous 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.

Johanna Azalea is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Johanna Azalea will grow to be about 4 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. 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. You may want to keep it away from hot, dry locations that receive direct afternoon sun or which get reflected sunlight, such as against the south side of a white wall. 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 foliage 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  Fall Color  Winter Value 
Ornamental Features