Rhododendron, Azalea 'Delaware Valley White'


Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Cultivar: Delaware Valley White
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4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)


Unknown - Tell us


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

Sun Exposure:

Sun to Partial Shade

Light Shade


All parts of plant are poisonous if ingested

Bloom Color:

White/Near White

Bloom Time:

Mid Spring



Other details:

Unknown - Tell us

Patent Information:


Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

Auburn, Alabama

Oxford, Connecticut

Stamford, Connecticut

Rehoboth Beach, Delaware

Wilmington, Delaware

Dacula, Georgia

Sugar Grove, Illinois

Crofton, Kentucky

Valley Lee, Maryland

Kalamazoo, Michigan

New Hyde Park, New York

Port Washington, New York

Warren Center, Pennsylvania

West Chester, Pennsylvania

Rock Hill, South Carolina

Clarksville, Tennessee

Knoxville, Tennessee

King George, Virginia

Leesburg, Virginia

Oakton, Virginia

Keyser, West Virginia

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Gardeners' Notes:


On Dec 30, 2014, vossner from East Texas,
United States (Zone 8a) wrote:

yep, a box store staple. I'm in a warmer climate and it did not do well for me, either. There are better cultivars out there so skip this one.


On Dec 30, 2014, coriaceous from ROSLINDALE, MA wrote:

This is the single most widely planted azalea in our area and a mainstay of cheap landscapers and big box stores alike. It's also a pet peeve of mine, and not just because it's overplanted.

Perhaps it does better further south, but here in Boston (Z6a) it has the following disadvantages:

1) In the fall, many of the leaves turn yellow and others stay green. It's mostly evergreen, but the foliage looks sickly all winter even when it's healthy. I'd much rather grow an azalea that's frankly deciduous.

2) After its brief season of bloom, the faded corollas turn brown and slimy and stick to the leaves in unsightly masses for months unless laboriously removed by hand.

3) When grown in full sun, it's often afflicted by azalea lacebug.... read more


On Feb 24, 2014, Rickwebb from Downingtown, PA wrote:

This is one of the most common cultivars of Evergreen Azaleas sold in the Mid-Atlantic. It is listed in the Manual of Woody Landscape Plants by Dr. Michael A Dirr in 1998 to be a Glen Dale hybrid, originally bred in Maryland. These Glen Dale Hybrids usually have bigger flowers than other kinds. I love Evergreen Azaleas as florist plants, but I am not fond of them as landscape plants because they often get icky bushy with a poor habit, especially in sun, and can hurt when working with them. They also are cheap over-used plants sold at any discount store. They get attacked by Azalea Lacebug and often brown in winter, especially in sunny, windy spots. I have a customer that has three of this cultivar together in part shade, a sheltered site from winds, and moist acid soil, and they look good ... read more


On Apr 22, 2006, sdagutis from Oakton, VA (Zone 7a) wrote:

Broadleaf evergreen shrub, may reach 4 feet in 10 years, compact, spreading. Leaves large medium green, may turn yellow in fall. Flowers white, 2 inches, mostly single some semi-double, 10 stamens.

A mucronatum hybrid: This cultivated hybrid azalea was grown in Japanese gardens over 300 years ago, but is not found in the wild. It was introduced from China into England in 1819. The hybridizer of Delaware Valley White is unknown. It is sometimes listed as a Glenn Dale azalea, however, it does not appear in the corrected list of Glenn Dale Azaleas published by Galle (1985, p. 235-251).