Tagged as: elms
ELM CULTIVARS (Ulmus spp.)
The following elm cultivars show varying resistance to Dutch elm disease (DED). Some of them are difficult to find in the nursery trade.
AMERICAN ELMS (Ulmus americana)
‘American Liberty'- (parent largely U. americana) from University of Wisconsin, a mixture of 6 clones with upright vase-shaped crowns, resistance to DED, susceptible to elm yellows
‘Delaware #2' - (1980 USDA OH), broad spreading crown, resistant to DED
‘Independence'- (1988 University of Wisconsin), a seedling of U. americana ‘Moline', vigorous, resists DED
‘Jefferson'- (1993 US Park Service), from National Mall in Washington D.C., parentage unknown, 50' tall, strong American elm, DED resistant
‘New Harmony'- (1992 USDA), broadly vase-shaped, straight trunked, drooping branches, tolerance to DED
‘Moline'- (1916 Moline, IL), narrow crown when young, fast grower, large leaves, DED susceptible
‘Patmore'- (1952 Patmore Nursery, Manitoba), upright narrow crown, densely branched and twiggy, sometime listed as ‘Brandon' or ‘Exhibition', susceptible to DED
‘Princeton'- (1922, Princeton Nursery of NJ), vigorous, large leathery leaves, vase-shaped narrow, slightly spreading crown, resistant to elm leaf beetle damage & DED
‘Valley Forge'- (US National Arboretum), upright, vase-shaped with full canopy, highly resistant to DED
‘Washington'- (US Park Service), 70-80', glossy foliage, DED resistant, clone of the tree General George Washington stood under as he assumed command of the Continental Army
ASIAN & EUROPEAN ELMS
Accolade® [‘Morton'] (U. davidiana var. japonica), 1986 Morton Arboretum introduction through Chicagoland Grows®; 50-60', vase-shaped, glossy green leaves, very good resistance to DED, elm yellows, elm leaf beetle, and elm leaf miner
‘Cathedral'- (U. pumila xU. japonica) 1991 University of Wisconsin introduction, good DED resistance, not as cold hardy as ‘New Horizon'
‘New Horizon', tolerant to verticillium wilt, excellent resistance to DED, and resists elm leaf miner
CommendationTM [‘Morton Stalwart']- Accolade® is the female parent, a rapid growing, tough tree with large leaves, DED and elm yellows resistant, Chicagoland Grows® introduction.
Danada CharmTM [‘Morton Red Tip'], 60', vase-shaped, emerging leaves red, glossy dark green at maturity, very good DED resistance, good elm yellows resistance, a Morton Arboretum introduction through Chicagoland GrowsTM
‘Dynasty' (U. parvifolia) 1984 US National Arboretum, vase-shaped, small crown, red fall color, cold-hardy, DED resistant
‘Frontier'- 1990 USDA, tolerant of drought, poor soil, compaction, stiff, rounded crown, DED resistant, moderate resistance to elm leaf beetle, good red fall color
‘Homestead'- 1970 USDA introduction, rapid grower, densely pyramidal to oval with arching branches, dark green foliage, resistant to DED, elm yellows, susceptible to elm leaf beetle.
‘New Horizon'- (U davidiana var. japonica x U. pumila), University of Wisconsin, vigorous, upright habit, full crown, stress tolerance, large, dark green leaves, DED resistant but some leaf beetle damage.
‘Ohio'- (U. parvifolia) 1990 US National Arboretum, 40', cold hardy, grayish-red fall color, DED resistant
‘Patriot'- (U. ‘Urban' x selection of U. wilsoniana), 1972 USDA introduction, 40-50', upright, stiffly vase-shaped, dark green foliage with yellow fall color, high DED resistance
‘Pioneer'- (U. x hollandica) 1984 USDA, globe-shaped, 50-60', rounded crown, dark green leaves, dense canopy, yellow fall color, DED & elm yellows resistant.
‘Prospector'- (U. wilsoniana), 1990 US National Arboretum, vase-shaped, dense crown, lower branches drooping, long, dark green leaves, high resistance to DED & elm leaf beetle
‘Regal'- (hybrid of complex European parentage) - 1983 University of Wisconsin, 50-60' x 30', almost columnar, strong central leader and open crown, good DED resistant
‘Sapporo Autumn Gold'- (U. pumila xU. japonica), 1975 University of Wisconsin, upright, vase-shaped with strong central trunk, young leaves tinged red, yellow fall color, high resistance to DED
TriumphTM [‘Morton Glossy']- upright oval to vase-shaped with arching branches, 55' x 50', glossy dark green leaves, yellow fall color, resistant to DED and elm yellows, god resistance to elm leaf beetle, Chicagoland Grows® introduction.
‘Urban'- ((U. hollandica ‘Vegetus' x U. minor) x U. pumila), 1972 USDA, fast growing, tolerant of poor soil and pollution, DED resistance
VanguardTM- [‘Morton Plainsman'] 50', waxy lustrous leaves, moderate resistance to elm leaf beetle, moderate grower, DED resistant, Morton Arboretum introduction through Chicagoland Grows®