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The U.S. National Arboretum presents Ulmus
'Frontier', an
elm tree of moderate stature with attractive red fall color.
'Frontier' hybrid elm combines a high level of tolerance to Dutch elm
disease, moderate resistance to elm leaf beetle, small leaves, and a
lovely red-purple autumn coloration. It is perfect for use in smaller
landscapes, along city streets, and under power lines. 'Frontier' blazes
a trail for elms in the urban landscape.
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'Frontier'
Hybrid Elm
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| Botanical Name: |
Ulmus (carpinifolia x
parvifolia) 'Frontier'
(NA 55393; PI 536049) |
| Family: |
Ulmaceae |
| Hardiness: |
U.S.D.A. Zones 5 - 8 |
| Development: |
'Frontier' is a selection that resulted from
controlled pollination of U. carpinifolia Geldtisch with U.
parvifolia Jacq. by A.M. Townsend in 1971. |
| Significance: |
'Frontier' represents the first commercial
release of an elm cultivar with spring-flowering (U. carpinifolia)
and fall-flowering species (U. parvifolia) as parents. A small to
intermediate sized tree with unusual red-purple fall color, this hybrid
elm exhibits both a high level of disease tolerance to the fungus that
causes Dutch elm disease and moderate resistance to the elm leaf beetle
in laboratory and field tests. In addition, 'Frontier' appears highly
tolerant to natural infections of elm yellows. Released 1990. |
| Description: |
Height and Width:
25 feet tall and 15 foot crown spread at 19 years
under sod culture.
Habit: Small
to intermediate sized, single trunked, upright-pyramidal deciduous tree.
Symmetrical shape. Faster growing than male parent, U. parvifolia.
Bark: Smooth,
grey-green with orange lenticels, not exfoliating.
Fruit: Rarely
flowers, no seed production observed. |
| Culture: |
Tolerant of urban conditions. Performed well
in diverse locations including California, Ohio, Oregon, Oklahoma and
Maryland. Avoid planting close to buildings in areas with high elm leaf
beetle populations. Slower growing in sod culture. |
| Propagation: |
Roots easily from softwood cuttings under
mist, 3000-8000 ppm IBA, in 3-5 weeks. 'Frontier' has been propagated
successfully by tissue culture. |
| Landscape Use: |
Excellent moderately-sized tree for use under
power lines, along parking areas and highways, and in landscape
plantings. |
| Availability: |
Available from wholesale nurseries. |
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U.S. National Arboretum Plant Introduction
Floral and Nursery Plants Research Unit
U.S. National Arboretum, U.S.
Department of Agriculture, Agricultural Research Service, 3501 New York
Ave., N.E., Washington, DC 20002 |
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U.S. National Arboretum website please follow this link.
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