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Knap Hill White Azalea*

Rhododendron 'Knap Hill White'

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Knap Hill White Azalea (Rhododendron 'Knap Hill White') at Oakland Nurseries Inc

Knap Hill White Azalea flowers

Knap Hill White Azalea flowers

(Photo courtesy of NetPS Plant Finder)

* This is a "special order" plant - contact store for details

Height:  6 feet

Spread:  6 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4b

Group/Class:  Knap Hill Hybrids

Description:

A sunny variety with bright white blooms with shell pink streaks and a yellow blotch; blooms in mid spring, creating an impressive border or low screen; absolutely must have well-drained, highly acidic and organic soil

Ornamental Features

Knap Hill White Azalea is covered in stunning clusters of lightly-scented white trumpet-shaped flowers with shell pink overtones and a yellow blotch at the ends of the branches in mid spring, which emerge from distinctive salmon flower buds before the leaves. It has green deciduous foliage. The narrow leaves turn an outstanding yellow in the fall.

Landscape Attributes

Knap Hill White 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.

Knap Hill White Azalea is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use

Planting & Growing

Knap Hill White 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. 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.

 

* This is a "special order" plant - contact store for details

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