Photo by Melody

PlantFiles: Winterberry Holly, Black Alder
Ilex verticillata 'Skipjack'

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Family: Aquifoliaceae (a-kwee-foh-lee-AY-see-ee) (Info)
Genus: Ilex (EYE-leks) (Info)
Species: verticillata (ver-ti-si-LAH-tuh) (Info)
Cultivar: Skipjack
Hybridized by William N. Kuhl, McLean Nurseries; Year of Registration or Introduction: 2006

Category:
Shrubs

Height:
4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)

Spacing:
4-6 ft. (1.2-1.8 m)
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)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Danger:
N/A

Bloom Color:
White/Near White

Bloom Time:
Late Spring/Early Summer

Foliage:
Deciduous
Smooth-Textured

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

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:
Non-patented

Propagation Methods:
From softwood cuttings
From semi-hardwood cuttings
By simple layering

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

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive ViburnumValley On Jan 25, 2012, ViburnumValley from Scott County, KY (Zone 5b) wrote:

'Skipjack' Winterberry Holly is a male plant necessary for pollination of all the wonderful fruiting female plants that have overlapping bloom time. These include the earlier blooming group of female clones like 'Afterglow', 'Aurantiaca', 'Chrysocarpa', 'Red Sprite', and 'Stoplight' among many others. This early and heavy blooming plant was selected and introduced by Bill Kuhl, the extraordinary nurseryman and holly enthusiast from the Baltimore MD area.

One can determine the sex of a Winterberry Holly when it is in bloom (if it is not known whether the plant fruits or not) by examining the small flowers. If the flowers have projecting stamens, it is a male plant. If the flowers only have a rounded bump in the center, then it is a female plant.

'Skipjack' requires no more effort to grow than any other Winterberry Holly, looking only for regular moisture (loves wet sites, like by a downspout) and soil on the acid side, though I have grown all ranges of deciduous hollies in KY on circumneutral clay loam soils.

Regional...

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

Georgetown, Kentucky
Parkville, Maryland



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