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Publication #ENH-482

Juniperus deppeana 'Mcfetter': McFetter Alligator Juniper1

Edward F. Gilman and Dennis G. Watson2

Introduction

This native North American evergreen tree found in the southwestern United States reaches 50 to 60 feet in height and forms a broad, pyramidal or rounded canopy. The crown probably spreads to about 20 or 25 feet. The trunk is normally rather short and covered with brown, scaly bark. The foliage has a rich blue coloration which stands out in the landscape against any background.

Figure 1. 

Mature Juniperus deppeana 'Mcfetter': McFetter Alligator Juniper


Credit:

Ed Gilman, UF/IFAS


[Click thumbnail to enlarge.]

General Information

Scientific name: Juniperus deppeana
Pronunciation: joo-NIP-er-us depp-ee-AY-nuh
Common name(s): McFetter alligator juniper
Family: Cupressaceae
USDA hardiness zones: 7A through 9B (Fig. 2)
Origin: native to North America
Invasive potential: little invasive potential
Uses: hedge; screen; reclamation; specimen; highway median; Bonsai
Availability: not native to North America

Figure 2. 

Range


[Click thumbnail to enlarge.]

Description

Height: 50 to 60 feet
Spread: 20 to 25 feet
Crown uniformity: symmetrical
Crown shape: oval, columnar
Crown density: dense
Growth rate: fast
Texture: fine

Foliage

Leaf arrangement: opposite/subopposite
Leaf type: simple
Leaf margin: entire
Leaf shape: scale-like
Leaf venation: none, or difficult to see
Leaf type and persistence: evergreen, fragrant
Leaf blade length: less than 2 inches
Leaf color: blue or blue-green
Fall color: no color change
Fall characteristic: not showy

Flower

Flower color: unknown
Flower characteristics: not showy

Fruit

Fruit shape: cone, round
Fruit length: less than .5 inch
Fruit covering: fleshy
Fruit color: unknown
Fruit characteristics: does not attract wildlife; not showy; fruit/leaves not a litter problem

Trunk and Branches

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

Culture

Light requirement: full sun
Soil tolerances: clay; sand; loam; acidic; alkaline; well-drained
Drought tolerance: high
Aerosol salt tolerance: unknown

Other

Roots: not a problem
Winter interest: no
Outstanding tree: yes
Ozone sensitivity: unknown
Verticillium wilt susceptibility: resistant

Pest resistance: resistant to pests/diseases

Use and Management

Mcfetter alligator juniper can be used as leyland cypress has been. Plant it on 15 to 20 foot centers to form a solid blue screen. Growth rate is rapid in full sun.

Mcfetter alligator juniper is grown in full sun on well-drained, slightly acid soil. It appears to perform well on clay soils and should be suited for many areas of the southern United States.

Pests

No pests are of major concern at this time. However, the plant has not been grown in the east for very long.

Diseases

No diseases are of major concern at this time.

Footnotes

1.

This document is ENH-482, 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.