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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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