The Japanese Elm

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 ...

''Ulmus davidiana'' var. ''japonica'' Discovery' is a cold-resistant selection from Canada, raised along with 'Freedom' in the 1980s by Dr Wilbert Ronald, of Jeffries Nurseries Ltd. and Rick Durand of Shade Consulting Services,

Portage la Prairie Portage la Prairie () is a small city in the Central Plains Region of Manitoba, Canada. In 2016, the population was 13,304 and the land area was . Portage la Prairie is approximately west of Winnipeg, along the Trans-Canada Highway (exactly ...

Manitoba Manitoba is a Provinces and territories of Canada, province of Canada at the Centre of Canada, longitudinal centre of the country. It is Canada's Population of Canada by province and territory, fifth-most populous province, with a population ...

Description

Unlike other Japanese Elms, the growth habit of 'Discovery' is symmetrical, upright, and vase-shaped. The leaves are obovate to oval, and slightly smaller than is typical of the species, their colour dark green turning yellow in autumn.
Photographs of 'Discovery', Todd P. West, 'Elms: the Good, the Bad and the Ugly'; North Dakota State University Department of Plant Sciences; November 2022; p.25-26 The tree grows to over 15 m in height, with a spread of much the same dimension.

Pests and diseases

The tree is resistant to Dutch elm disease and 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 ...

''.

Cultivation

'Discovery' performed very poorly in government trial

in

Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

, failing completely at five out of six sites. Moreover, the survivors developed a very poor branching pattern requiring pruning to strengthen crotches. 'Discovery' fared better in trials conducted 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 ...

, which considered it "quite hardy", but the tree was criticized for its comparatively slow growth and need for continued crown thinning when young, the latter factor largely disqualifying it as a street tree.Giblin, C. P. & Gillman, J. H. (2006). ''Elms for the Twin Cities: A Guide for Selection and Maintenance.'' University of Minnesota. Nonetheless, a number of trees have been established in the Minneapolis Parks system. The species does not sucker from roots. 'Discovery' is not known to have been introduced to

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

Australasia Australasia is a subregion of Oceania, comprising Australia, New Zealand (overlapping with Polynesia), and sometimes including New Guinea and surrounding islands (overlapping with Melanesia). The term is used in a number of different context ...

Accessions

North America

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 ...

Dallas Center Dallas Center is a city in Dallas County, Iowa, United States. The population was 1,901 during the 2020 census. It is part of the Des Moines– West Des Moines Metropolitan Statistical Area. History Dallas Center got its start in the year 186 ...

Iowa Iowa ( ) is a U.S. state, state in the upper Midwestern United States, Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Ill ...

, US. No details available. *

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. 4703.

Nurseries

North America

*Bailey Nurserie

St. Paul, Minnesota, St. Paul,

Minnesota Minnesota ( ) is a U.S. state, state in the Upper Midwestern region of the United States. It is bordered by the Canadian provinces of Manitoba and Ontario to the north and east and by the U.S. states of Wisconsin to the east, Iowa to the so ...

, US. *Jeffries Nurserie

, Canada. *Johnson's Nurser

Menomonee Falls Menomonee Falls is a village in Waukesha County, Wisconsin, United States. Its population was 38,527 at the 2020 United States census, 2020 census, making it the most-populous village in Wisconsin. It is part of the Milwaukee metropolitan area. ...

Wisconsin Wisconsin ( ) is a U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest of the United States. It borders Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michig ...

, US. *Lee Nursery Inc

Fertile, Minnesota, Fertile, Minnesota, US. *Linder's Garden Cente

St. Paul, Minnesota, St. Paul, Minnesota, US. *Minnesota Valley Nurserie

Shakopee, Minnesota, Shakopee, Minnesota, US. *Patmore Nurser

Brandon, Manitoba, Brandon, Manitoba, US. *Robinson Nurser

Amity, Oregon Amity is a city in Yamhill County, Oregon, Yamhill County, Oregon, United States. As of the United States 2020 Census, 2020 Census, the population was 1,757. History The town was established between 1848 and 1849 by Joseph Watt (pioneer), Joseph ...

, US. *Sun Valley Garden Centr

,

Eden Prairie Eden Prairie is a city in Hennepin County, Minnesota, United States. It had a population of 64,198 at the 2020 census, making it the 16th-largest city in Minnesota. The city is adjacent to the north bank of the Minnesota River, upstream from ...

, Minnesota, US.

References

External links

*http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Return of the Elm -the status of elms in the nursery industry in 2000. Warren, K., J. Frank Schmidt and Co. {{Elm species, varieties, hybrids, hybrid cultivars and species cultivars , state=collapsed Japanese elm cultivar Ulmus articles missing images Ulmus