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Triumph' Hybrid Elm is resistant to Dutch Elm Disease, elm yellows, elm leaf beetle, and phloem necrosis.

Tree of the Month: ‘Triumph’ Hybrid Elm

By Leonard Phillips, ASLA Emeritus


Trade Name: ‘TriumphTM’ Hybrid Elm

Botanical Name: Ulmus ‘Morton Glossy’

Parentage: U. wilsoniana x U. japonica (‘Accolade’) x U. japonica x U. pumila (‘Vanguard’), developed at Morton Arboretum by George Ware

Family: Ulmaceae

Year of Introduction: 1997

Height: 50 to 60 feet

Spread: 45 to 50 feet

Form: Upright oval to vase shape

Bloom Period: August and September

Flower: Inconspicuous

Fruit: Round samara

Summer Foliage: Dark green in summer, glossy, large leaves

Autumn Foliage: Bright yellow in autumn

Winter Color: Bark provides winter interest

Bark: Grayish brown

Habitat: Asian origin

Culture: Tolerates most soils and urban conditions, prefers rich, moist but not wet soil

Hardiness Zone: 4 to 9

Growth Rate: Fast, full size in 50 years, average 1 to 3 feet per year

Pest Resistance: Resistant to Dutch Elm Disease, elm yellows, elm leaf beetle, and phloem necrosis

Storm Resistance: Strong branches

Salt Resistance: Good

Planting: Easily transplanted B&B, quickly recovers

Pruning: Prune in fall

Propagating: Budded onto U. pumila understock, made from cuttings on own roots, and by tissue culture

Design Uses: Medium texture, good for homes, streets, parks, and commercial landscapes

Companions: Looks good with most general landscape plants

Other Comments: Symmetrical growth

Available from: Most large nurseries


* For information about the USDA Hardiness Zone Map, visit www.usna.usda.gov/Hardzone/index.html


These are the personal observations of the author, living in New England — Zone 5. Len Phillips can be reached via e-mail at lenphillips@on-line-seminars.com


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