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Publication #ENH-830

x Cupressocyparis leylandii 'Naylor's Blue': 'Naylor's Blue' Leyland Cypress1

Edward F. Gilman and Dennis G. Watson2

Introduction

A moderate to rapidly-growing evergreen when young, `Naylor's Blue' Leyland Cypress will easily grow three feet per year, even on poor soils, and will ultimately attain a majestic height of 50 feet or more in the west, perhaps somewhat shorter in the east. Leyland Cypress forms a dense, oval or pyramidal outline when left unpruned, but the graceful, pendulous branches will tolerate severe trimming to create a formal hedge, screen or windbreak. The fine, feathery glaucous blue-green foliage is composed of soft, pointed leaves on flattened branchlets and are dark blue-green when mature. Leyland Cypress quickly outgrows its space in small landscapes and is too big for most residential landscapes unless it will be regularly trimmed. Although it can be sheared into a tall screen on small lots, Leyland Cypress should probably be saved for large-scale landscapes where it can be allowed to develop into its natural shape.

Figure 1. 

Middle-aged x Cupressocyparis leylandii 'Naylor's Blue': 'Naylor's Blue' Leyland Cypress


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General Information

Scientific name: x Cupressocyparis leylandii
Pronunciation: x koo-press-so-SIP-air-iss lay-LAN-dee-eye
Common name(s): 'Naylor's Blue' Leyland Cypress
Family: Cupressaceae
USDA hardiness zones: 6A through 10A (Fig. 2)
Origin: not native to North America
Invasive potential: little invasive potential
Uses: specimen; screen; hedge; highway median; Christmas tree
Availability: not native to North America

Figure 2. 

Range


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Description

Height: 40 to 50 feet
Spread: 15 to 25 feet
Crown uniformity: symmetrical
Crown shape: oval, pyramidal, columnar
Crown density: dense
Growth rate: fast
Texture: fine

Foliage

Leaf arrangement: opposite/subopposite (Fig. 3)
Leaf type: simple
Leaf margin: entire
Leaf shape: scale-like
Leaf venation: none, or difficult to see
Leaf type and persistence: evergreen
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: no flowers
Flower characteristics: no flowers

Fruit

Fruit shape: round
Fruit length: less than .5 inch
Fruit covering: dry or hard
Fruit color: brown
Fruit characteristics: does not attract wildlife; not 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: thin
Wood specific gravity: unknown

Culture

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

Other

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

Pest resistance: sensitive to pests/diseases

Use and Management

Leyland Cypress grows in full sun on a wide range of soils, from acid to alkaline, but looks its best on moderately fertile soil with sufficient moisture. It is surprisingly tolerant of severe pruning, recovering nicely from even severe topping (although this is not recommended), even when half the top is removed. It grows well in clay soil and tolerates poor drainage for a short period of time. It also is very tolerant of salt spray.

Some other cultivars include: `Castlewellan', a more compact form with gold-tipped leaves, excellent for hedges in cool climates; `Leighton Green', dense branching with dark green foliage, columnar form; `Haggerston Gray', loose branches, columnar-pyramidal, upturned at ends, sage-green color; `Silver Dust', wide-spreading form with blue-green foliage marked with white variegations.

Propagation is by cuttings from side growths.

Pests

Bagworm can defoliate a tree in a week or two, and can be quite serious.

Diseases

A canker affects the tree following drought; a foliage fungus occasionally infects foliage. This plant is not recommended for planting in California due to the severity of this canker disease. Perhaps the disease will stay in the western United States.

Footnotes

1.

This document is ENH-830, one of a series of the Environmental Horticulture, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date November 1993. Revised December 2006. Reviewed May 2011. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Edward F. Gilman, professor, Environmental Horticulture Department; Dennis G. Watson, former associate professor, Agricultural Engineering Department, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, 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.