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

6 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

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Spring


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

Patent Information:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By sdagutis
Thumbnail #1 of Rhododendron  by sdagutis

By sdagutis
Thumbnail #2 of Rhododendron  by sdagutis

By sdagutis
Thumbnail #3 of Rhododendron  by sdagutis

By Jim46
Thumbnail #4 of Rhododendron  by Jim46

By RonDEZone7a
Thumbnail #5 of Rhododendron  by RonDEZone7a

By DaylilySLP
Thumbnail #6 of Rhododendron  by DaylilySLP

By DaylilySLP
Thumbnail #7 of Rhododendron  by DaylilySLP

There are a total of 11 photos.
Click here to view them all!


1 positive
1 neutral
No negatives

Gardeners' Notes:

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
Richmond, Texas
King George, Virginia
Oakton, Virginia
Keyser, West Virginia

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2014 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America