shrub

Red Rhododendron

Rhododendron delavayi

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Red Rhododendron (Rhododendron delavayi) at Martin's Home and Garden

Red Rhododendron flowers

Red Rhododendron flowers

(Photo courtesy of NetPS Plant Finder)

Height:  15 feet

Spread:  10 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  5b

Description:

A stunning variety with amazing scarlet blooms; an unusual showy accent plant; absolutely must have well-drained, highly acidic and organic soil, use plenty of peat moss when planting

Ornamental Features

Red Rhododendron is covered in stunning clusters of lightly-scented scarlet trumpet-shaped flowers at the ends of the branches in mid spring. It has green foliage. The narrow leaves remain green throughout the winter. The fruit is not ornamentally significant.

Landscape Attributes

Red Rhododendron 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.

Red Rhododendron is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Red Rhododendron will grow to be about 15 feet tall at maturity, with a spread of 10 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
Characteristics
Accent  Massing  Garden 
Applications
Flowers  Winter Value 
Ornamental Features