American Holly
Ilex opaca 'Jersey Knight'

Family: Aquifoliaceae (a-kwee-foh-lee-AY-see-ee) (Info)
Genus: Ilex (EYE-leks) (Info)
Species: opaca (oh-PAK-uh) (Info)
Cultivar: Jersey Knight

Category:

Trees

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

Where to Grow:

Unknown - Tell us

Height:

30-40 ft. (9-12 m)

over 40 ft. (12 m)

Spacing:

15-20 ft. (4.7-6 m)

20-30 ft. (6-9 m)

30-40 ft. (9-12 m)

Hardiness:

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

Danger:

Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:

White/Near White

Inconspicuous/none

Bloom Time:

Late Spring/Early Summer

Foliage:

Grown for foliage

Evergreen

Provides winter interest

Other details:

Unknown - Tell us

Soil pH requirements:

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 hardwood cuttings

By grafting

Seed Collecting:

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

Regional

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

Clermont, Kentucky

Georgetown, Kentucky

Louisville, Kentucky

Owings Mills, Maryland

Parkville, Maryland

New Brunswick, New Jersey

show all

Gardeners' Notes:

1
positive
0
neutrals
0
negatives
RatingContent
Positive

On Jan 18, 2015, ViburnumValley from Scott County, KY (Zone 5b) wrote:

'Jersey Knight' American Holly is an excellent male holly tree for conditions up through zone 6a. It was selected as a wild seedling in 1945 in New Jersey, and later named/registered by Dr. Elwin Orton, Jr. of Rutgers University.

This tree has lustrous dark green glossy foliage, and passes this trait on to offspring for which it is the male pollen parent. It has performed very well in landscapes from New Jersey to Kentucky.