Winterberry Holly, Black Alder 'Cacapon'

Ilex verticillata

Family: Aquifoliaceae (a-kwee-foh-lee-AY-see-ee) (Info)
Genus: Ilex (EYE-leks) (Info)
Species: verticillata (ver-ti-si-LAH-tuh) (Info)
Cultivar: Cacapon
Hybridized by O. M. Neal
Registered or introduced: 1973




Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

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

Very high moisture needs; suitable for bogs and water gardens

Where to Grow:

Grow outdoors year-round


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)


6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)


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)

Sun Exposure:

Full Sun

Sun to Partial Shade



Bloom Color:

White/Near White

Bloom Time:

Late Spring/Early Summer


Grown for foliage


Other details:

Unknown - Tell us

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:


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


This plant has been said to grow in the following regions:

Vincennes, Indiana

Clermont, Kentucky

Georgetown, Kentucky

Louisville, Kentucky

Gardeners' Notes:


On Nov 25, 2010, ViburnumValley from Scott County, KY (Zone 5b) wrote:

'Cacapon' winterberry is a large heavy fruiting deciduous holly. This plant derives from the long term selection efforts of O. M. Neal from wild plants in West Virginia.

This is an exceptionally hardy plant, and also tolerant of droughty periods as evidenced by its persistence in the large collection at Bernheim Arboretum on a relatively inhospitable site for winterberries.

It has vivid deep red fruit, and reaches a mature size of 12' x 8' on an upright plant.

This is a fine addition to anyone's winterberry grove.