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Publication #ENH474

Ilex x attenuata 'Fosteri': Fosters Holly1

Edward F. Gilman and Dennis G. Watson2

Introduction

Foster's holly #2 is one of the better cultivars of Ilex x attenuata, part of a group of hybrids between Ilex cassine x Ilex opaca. Foster's holly reaches 15 to 25 feet in height with a spread of 8 to 12 feet, creating a dense, pyramidal silhouette. The trunk usually grows straight up through the crown, unless the tree was topped. The small, glossy, almost black-green, linear leaves have spiny margins, and are joined in spring by showy, small, white flowers. The blooms are followed by the heavy production of brilliant red berries, which persist on female trees from fall through winter.

Figure 1. 

Middle-aged Ilex x attenuata 'Fosteri': Fosters Holly


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General Information

Scientific name: Ilex x attenuata
Pronunciation: EYE-lecks x uh-ten-yoo-AY-tuh
Common name(s): Fosters holly
Family: Aquifoliaceae
USDA hardiness zones: 6A through 9B (Fig. 2)
Origin: not native to North America
Invasive potential: little invasive potential
Uses: hedge; parking lot island < 100 sq ft; parking lot island 100-200 sq ft; parking lot island > 200 sq ft; container or planter; screen; specimen; street without sidewalk; sidewalk cutout (tree pit); tree lawn 3-4 feet wide; tree lawn 4-6 feet wide; tree lawn > 6 ft wide; highway median; bonsai
Availability: not native to North America

Figure 2. 

Range


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Description

Height: 15 to 25 feet
Spread: 8 to 12 feet
Crown uniformity: symmetrical
Crown shape: pyramidal, columnar
Crown density: dense
Growth rate: slow
Texture: fine

Foliage

Leaf arrangement: alternate (Fig. 3)
Leaf type: simple
Leaf margin: spiny, entire, pectinate
Leaf shape: elliptic (oval), ovate
Leaf venation: pinnate
Leaf type and persistence: evergreen
Leaf blade length: less than 2 inches, 2 to 4 inches
Leaf color: green
Fall color: no color change
Fall characteristic: not showy

Figure 3. 

Foliage


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Flower

Flower color: white/cream/gray
Flower characteristics: not showy

Fruit

Fruit shape: round
Fruit length: less than .5 inch
Fruit covering: fleshy
Fruit color: red
Fruit characteristics: attracts birds; showy; fruit/leaves not a litter problem

Trunk and Branches

Trunk/bark/branches: branches don't droop; not showy; typically one trunk; thorns
Pruning requirement: little required
Breakage: resistant
Current year twig color: green
Current year twig thickness: medium
Wood specific gravity: unknown

Culture

Light requirement: full sun, partial sun, or partial shade
Soil tolerances: clay; sand; loam; acidic; slightly alkaline; well-drained; extended flooding
Drought tolerance: high
Aerosol salt tolerance: moderate

Other

Roots: not a problem
Winter interest: yes
Outstanding tree: yes
Ozone sensitivity: unknown
Verticillium wilt susceptibility: resistant
Pest resistance: resistant to pests/diseases

Use and Management

With its dense, compact, upright growth and neat habit, Foster's holly is ideal for use as a tightly clipped screen or hedge, or as a specimen, foundation, or container planting. Can also be planted in a small soil space or in a tall, narrow overhead space. Would probably make a suitable street tree but has not been extensively tried.

Foster's holly should be grown in full sun or partial shade on well-drained, slightly acid, moist soil. It is very drought-tolerant once established and has no serious pest problems.

There are other Foster's hollies—#1 and #4—but these are less available and perhaps not as showy.

Propagation is by cuttings or grafting.

Pests

Scale and leaf miners.

Diseases

No diseases are of major concern.

Footnotes

1.

This document is ENH474, one of a series of the Environmental Horticulture Department, UF/IFAS Extension. Original publication date November 1993. Revised December 2006. Reviewed February 2014. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Edward F. Gilman, professor, Environmental Horticulture Department; and Dennis G. Watson, former associate professor, Agricultural Engineering Department, UF/IFAS Extension, Gainesville FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.