Commendation™ Elm - U. 'Morton Stalwart'
Family Ulmaceae - Zelkova, Hackberry, Elm

Introduced by Chicagoland Grows™, Commendation elm is a tough, fast-growing tree.
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Ulmus pumilla x U. carpinifolia
1. Ulmus pumilla x U. carpinifolia
Morton Accolade elm
2. Morton Accolade elm

Commendation Elm 'Morton Stalwart' is a hybrid of these two trees, themselves both hybrids

Once a very popular and long-lived (300+ years) shade and street tree, American Elm suffered a dramatic decline in the 1950s with the infestation of Dutch elm disease, a fungus spread by a bark beetle. Accolade, Commendation, Triumph, and numerous other elm varieties are the result of efforts to provide elms with more disease and insect resistance.

Cultivar 'Morton Stalwart', trade name Commendation™, is a complex hybrid of the Morton Accolade™ (fig 2.) elm and
Ulmus pumilla x U. carpinifolia (fig.1) from eastern Russia. Listed as a fast-growing, tough, robust tree, this elm grows to 60 feet and spreads to 50. Extremely drought-resistant, cold tolerant, and resistant to Dutch Elm disease, it is nevertheless moderately susceptible to gypsy moth, Japanese beetle, and elm leaf beetle damage. [1]


Commendation Elm is 14 years old [2]
Commendation™ Elm foliage
Chicagoland Grows™ is a corporate partnership among the Chicago Botanic Garden, the Morton Arboretum and the Ornamental Grower’s Association of Northern Illinois (OGA). Established in 1986, CG works collectively with industry professionals in the OGA and throughout North America to develop, select, evaluate, produce and market new and recommended plant cultivars. These selected plants offer fine ornamental attributes and proven dependability to both landscape professionals and home gardeners.
References
  1. The Morton Arboretum, "Commendation™ Elm"
  2. Commendation elm, Morton Arboretum acc. 274-97-1, photos © Bruce Marlin
Tree Encyclopedia / North American Insects & Spiders is dedicated to providing scientific and educational resources for our users through use of large images and macro photographs of flora and fauna.
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Family Ulmaceae - Zelkovas, Hackberries and Elms
There are about 200 species of trees and shrubs in Ulmaceae. Elms fell victim to Dutch Elm disease during the 1950s; until that time, they were the premier shade tree along the streets of our American towns and cities. The Morton Arboretum in past years has bred and marketed five new elm varieties resistant to Dutch elm disease.
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