Skillins Plant Catalog

Locations

Brunswick

422 Bath Road
Brunswick, ME 04011
1-800-339-8111
207-442-8111

Falmouth

89 Foreside Road
Falmouth, ME 04105
1-800-244-3860
207-781-3860

Cumberland

201 Gray Rd (Route 100)
Cumberland, ME 04021
1-800-348-8498
207-829-5619

shrub

Calsap Rhododendron

Rhododendron 'Calsap'

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Calsap Rhododendron (Rhododendron 'Calsap') at Skillins Greenhouse

Calsap Rhododendron flowers

Calsap Rhododendron flowers

(Photo courtesy of NetPS Plant Finder)

Calsap Rhododendron (Rhododendron 'Calsap') at Skillins Greenhouse

Calsap Rhododendron in bloom

Calsap Rhododendron in bloom

(Photo courtesy of NetPS Plant Finder)

Calsap Rhododendron (Rhododendron 'Calsap') at Skillins Greenhouse

Calsap Rhododendron flowers

Calsap Rhododendron flowers

(Photo courtesy of NetPS Plant Finder)

Height:  5 feet

Spread:  5 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4b

Description:

A stunning variety with amazing pure white blooms accented with a contrasting dark red blotch; an unusual showy accent plant; absolutely must have well-drained, highly acidic and organic soil, use plenty of peat moss when planting

Ornamental Features

Calsap Rhododendron is covered in stunning clusters of lightly-scented white trumpet-shaped flowers with a dark red blotch 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

Calsap 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.

Calsap Rhododendron is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Calsap Rhododendron 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  Winter Value 
Ornamental Features
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