Photo by Melody

PlantFiles: American Holly
Ilex opaca 'Jersey Knight'

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

One vendor has this plant for sale.

Category:
Trees

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

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Provides winter interest

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

Click thumbnail
to view:

By ViburnumValley
Thumbnail #1 of Ilex opaca by ViburnumValley

By ViburnumValley
Thumbnail #2 of Ilex opaca by ViburnumValley

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive ViburnumValley 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.

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



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