Photo by Melody

PlantFiles: Azalea
Rhododendron 'Delaware Valley White'

Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Cultivar: Delaware Valley White

» View all varieties of Azaleas and Rhododendrons

One vendor has this plant for sale.

7 members have or want this plant for trade.


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

Patent Information:

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

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There are a total of 11 photos.
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1 positive
1 neutral
2 negatives

Gardeners' Notes:

Negative vossner On Dec 30, 2014, vossner from Richmond, TX (Zone 9a) 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.

Negative coriaceous 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.

I too doubt that it's hardy north of Z6a, and so apparently does Dirr.

Neutral Rickwebb 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 all year long with good evergreen foliage. I am skeptical of them being hardy to USDA Zone 5a. A few cultivars can make it to Zone 5b, but most only to Zone 6a. Evergreen Azaleas come from East Asia, most stock from Japan, all having tiny evergreen leaves and slender stems.

The real Azaleas are more upright, have stout stems, bigger buds, can have yellow and orange flowers, are deciduous with yellow or orange autumn color, even red, and are neater, more expensive, higher quality plants native to North America and Asia.

Positive sdagutis 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).


This plant has been said to grow 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
Oakton, Virginia
Keyser, West Virginia

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