''Ulmus'' 'Morton Stalwart' (selling name ), is a

Morton Arboretum The Morton Arboretum, in Lisle, Illinois, United States, is a public garden and outdoor museum with a library, herbarium, and program in tree research including the Center for Tree Science. Its grounds, covering 1,700 acres (6.9 square kilometre ...

hybrid Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two diff ...

cultivar A cultivar is a kind of Horticulture, cultivated plant that people have selected for desired phenotypic trait, traits and which retains those traits when Plant propagation, propagated. Methods used to propagate cultivars include division, root a ...

arising from a controlled crossing of with the hybrid of a Field Elm ''U. minor'' from eastern Russia and a Siberian Elm ''U. pumila''.Morton Arboretum Commendation Elm
/ref> Tested in the US National Elm Trial coordinated by

Colorado State University Colorado State University (Colorado State or CSU) is a Public university, public Land-grant university, land-grant research university in Fort Collins, Colorado, United States. It is the flagship university of the Colorado State University Syst ...

, averaged a survival rate of 85% after 10 years.

Description

The branches are upright, but the form of the tree is more oval than vase-shaped; the leaves are relatively large. However, examples grown in the warmer climes of the southern United States have not impressed, and it was dismissed, along with its Morton stablemates and , as 'ugly' by Michael Dirr, Professor of Horticulture at the

University of Georgia The University of Georgia (UGA or Georgia) is a Public university, public Land-grant university, land-grant research university with its main campus in Athens, Georgia, United States. Chartered in 1785, it is the oldest public university in th ...

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on account of its 'wild' growth and splaying branches.

Pests and diseases

Although resistant to Dutch elm disease in the United States, the tree is moderately susceptible to insects, notably elm leaf beetle ''

Xanthogaleruca luteola ''Xanthogaleruca luteola'', commonly known as the elm-leaf beetle, is a beetle species in the family Chrysomelidae that is native to Europe but invasive in other parts of the world.http://cisr.ucr.edu/elm_leaf_beetle.html - Center for Invasive ...

'',McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, 32–36.

Japanese beetle The Japanese beetle (''Popillia japonica'') is a species of Scarabaeidae, scarab beetle. Due to the presence of Predation, natural predators, the Japanese beetle is not considered a pest in its native Japan, but in North America and some region ...

Brady, C., Condra, J., & Potter, D. (2008) Resistance of Landscape-suitable Elm (Ulmus spp.) Cultivars to Japanese Beetle, Leaf Miners, and Gall Makers. ''2008 Research Report, Nursery & Landscape Program'', 15–16. University of Kentucky. and

Gypsy moth ''Lymantria dispar'', also known as the gypsy moth or the spongy moth, is a species of moth in the family Erebidae native to Europe and Asia. ''Lymantria dispar'' is subdivided into several subspecies, with subspecies such as '' L. d. dispar'' ...

Cultivation

is vigorous and robust, adjudged the third fastest-growing cultivar of 17 assessed by the

University of Minnesota The University of Minnesota Twin Cities (historically known as University of Minnesota) is a public university, public Land-grant university, land-grant research university in the Minneapolis–Saint Paul, Twin Cities of Minneapolis and Saint ...

and fourth out of 15 in trials at

UC Davis The University of California, Davis (UC Davis, UCD, or Davis) is a Public university, public Land-grant university, land-grant research university in Davis, California, United States. It is the northernmost of the ten campuses of the University ...

. The tree is also extremely tolerant of droughtGiblin, C. P. & Gillman, J. H. (2006). ''Elms for the Twin Cities: A Guide for Selection and Maintenance.'' University of Minnesota. and cold; in artificial freezing tests at the Morton ArboretumShirazi, A. M. & Ware, G. H. (2004). ''Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes''. International Symposium on Asian Plant Diversity & Systematics 2004,

Sakura The cherry blossom, or sakura, is the flower of trees in ''Prunus'' subgenus '' Cerasus''. ''Sakura'' usually refers to flowers of ornamental cherry trees, such as cultivars of ''Prunus serrulata'', not trees grown for their fruit (although ...

, Japan. the tree was found cold-hardy to −40° C. was introduced by Chicagoland Grows and is currently being evaluated in the

National Elm Trial The National Elm Trial was an American volunteer effort to evaluate a range of newly developed elm cultivars as replacements for elms destroyed by Dutch elm disease. The Colorado State University College of Agricultural Sciences coordinated the ...

CSU Shade Tree Lab
coordinated by

. The tree was introduced to the UK in 2014, but is not known (2016) to have been introduced to Australasia. File:190908 179 Chicago Botanic Gdn - Esplanade, North Lake, Ulmus 'Morton Stalwart' Commendation™ Elm (48861571041).jpg, ''Ulmus'' 'Morton Stalwart' Commendation™, Esplanade, North Lake, Chicago Botanic Garden (September 2019) File:CBG Esplanade - view of North Lake, Ulmus 'Morton Stalwart' Commendation 150627 (19713630363).jpg, Boles of 'Morton Stalwart' Commendation™

Accessions

;North America *

Arnold Arboretum The Arnold Arboretum is a botanical research institution and free public park affiliated with Harvard University and located in the Jamaica Plain and Roslindale, Massachusetts, Roslindale neighborhoods of Boston. Established in 1872, it is the ...

, US. Acc. no. 131–2002 *

Bickelhaupt Arboretum Bickelhaupt Arboretum (14 acres) is a Non-profit organization, non-profit arboretum located in Clinton, Iowa. The arboretum is open dawn to dusk daily without charge. The arboretum was established by Bob and Frances Bickelhaupt around their ho ...

, US. Acc. no. 02–018 *

Brenton Arboretum The Brenton Arboretum is a 141-acre arboretum and public garden in Dallas Center, Iowa, United States, established in 1997. The arboretum displays 175 native Iowa trees and shrubs suitable to the site, as well as many other tree species which c ...

, US. 5 trees, acquired 2009. Acc. no. not known. *

Chicago Botanic Garden The Chicago Botanic Garden is a botanical garden situated on nine islands in the northern Cook County Forest Preserves. It features 27 display gardens and five natural habitats including Mary Mix McDonald Woods, Barbara Brown Nature Reserve, Di ...

, US. 1 tree, planted in the Parking Lots; no other details available. *

Dawes Arboretum The Dawes Arboretum is a nonprofit arboretum located in Newark, Ohio. It includes nearly of plant collections, gardens and natural areas. The site includes approximately 12 miles (19 km) of hiking trails and roadways for a four-mile (6&nb ...

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US. 2 trees, no acc. details available. *

Holden Arboretum The Holden Arboretum, in Kirtland, Ohio, is one of the largest arboreta and botanical gardens in the United States, with more than , including devoted to collections and gardens. Diverse natural areas and ecologically sensitive habitats make u ...

, US. Acc. no. 00–124 *

, US. Acc. nos. 274–97, 109–2006. *

Smith College Smith College is a Private university, private Liberal arts colleges in the United States, liberal arts Women's colleges in the United States, women's college in Northampton, Massachusetts, United States. It was chartered in 1871 by Sophia Smit ...

, US. Acc. no. 36405 *

University of Idaho The University of Idaho (U of I, or UIdaho) is a public land-grant research university in Moscow, Idaho, United States. Established in 1889 and opened three years later, it was the state's sole university for 71 years, until 1963. The un ...

Arboretum, US. Two trees. Acc. no. 2000089 ;Europe *

Grange Farm Arboretum The Grange Farm Arboretum is a small private arboretum comprising 3 hectares accommodating over 800 trees, mostly native and ornamental species or cultivars, notably oaks, ashes, walnuts and elms, growing on a calcareous loam.Ostler, J. (2009) ...

Lincolnshire Lincolnshire (), abbreviated ''Lincs'', is a Ceremonial counties of England, ceremonial county in the East Midlands and Yorkshire and the Humber regions of England. It is bordered by the East Riding of Yorkshire across the Humber estuary to th ...

, UK. Acc. no. 1141.

References

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