Winterberry Holly, Black Alder 'Winter Red'

Ilexverticillata

Family
Aquifoliaceae (a-kwee-foh-lee-AY-see-ee)
Genus
Ilex (EYE-leks)
Species
verticillata (ver-ti-si-LAH-tuh)
Synonym
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Grown for foliage
Deciduous
Height
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)
Spacing
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
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)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
Danger
N/A
Bloom Color
White/Near White
Bloom Time
Late Spring/Early Summer
Other Details
Category
Shrubs
Trees
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Grow outdoors year-round in hardiness zone
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
4.6 to 5.0 (highly acidic)
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Patented
Propagation Methods
From softwood cuttings
From semi-hardwood cuttings
By simple layering
Seed Collecting
Remove fleshy coating on seeds before storing
Properly cleaned, seed can be successfully stored
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Regional

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

Birmingham, Alabama

Indianapolis, Indiana

Vincennes, Indiana

Clermont, Kentucky

Georgetown, Kentucky

Lexington, Kentucky

Louisville, Kentucky

Nicholasville, Kentucky

Paris, Kentucky

Versailles, Kentucky

Lexington, Massachusetts

Chaska, Minnesota

Downingtown, Pennsylvania

Meshoppen, Pennsylvania

Nottingham, Pennsylvania

Portsmouth, Virginia

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Featured Videos

Gardener's Notes:

4
positives
0
neutral
0
negative
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R
Lexington, MA (Zone 6a) | July 2017 | positive

I like Winter Red a lot too. I tested it in a very sandy area that is impossible to improve enough. Compared to several other cultivars...Read More

R
Downingtown, PA | February 2014 | positive

It is a beautiful shrub that is neat, clean, and looks good all four seasons. Not all shrubs look good all year with good form, foliage, ...Read More

P
Auburn Four Corners, PA (Zone 5a) | August 2009 | positive

Winter Red is a very nice Winterberry, which has fruited yearly for us with a good crop of berries. I have tried some other cultivars wit...Read More

V
Scott County, KY (Zone 5b) | January 2007 | positive

Winter Red® winterberry is simply the best winterberry ever introduced to the gardening world. If the late Bob Simpson of Vincennes IN ...Read More

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