The Japanese Elm

cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture ...

''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 Durrand of Shade Consulting Services,

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

Manitoba , image_map = Manitoba in Canada 2.svg , map_alt = Map showing Manitoba's location in the centre of Southern Canada , Label_map = yes , coordinates = , capital = Win ...

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. 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 Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Although believed to be originally native to Asia, the disease was accidentally introduced into America, Europe, ...

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 Sp ...

''.

Cultivation

'Discovery' performed very poorly in government trial

in

Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Ter ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tota ...

, 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, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public university, public Land-grant university, land-grant research university in the Minneapolis–Saint Paul, Tw ...

, 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 large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...

Australasia Australasia is a region that comprises Australia, New Zealand and some neighbouring islands in the Pacific Ocean. The term is used in a number of different contexts, including geopolitically, physiogeographically, philologically, and ecolo ...

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 can ...

, Dallas Center,

Iowa Iowa () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wiscon ...

, US. No details available. *

Smith College Smith College is a private liberal arts women's college in Northampton, Massachusetts. It was chartered in 1871 by Sophia Smith and opened in 1875. It is the largest member of the historic Seven Sisters colleges, a group of elite women's c ...

, US. Acc. no. 4703.

Nurseries

North America

*Bailey Nurserie

St. Paul, Minnesota, St. Paul,

Minnesota Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the List of U.S. states and territories by population, 22nd most populous, with over 5.75 million residents. Minne ...

, US. *Jeffries Nurserie

Manitoba , image_map = Manitoba in Canada 2.svg , map_alt = Map showing Manitoba's location in the centre of Southern Canada , Label_map = yes , coordinates = , capital = Win ...

, Canada. *Johnson's Nurser

Menomonee Falls Menomonee Falls is a village in Waukesha County, Wisconsin, United States, and is part of the Greater Milwaukee area. The population was 35,626 at the 2010 census, making it the most populous village in Wisconsin. It is the fourth largest commun ...

Wisconsin Wisconsin () is a state in the upper Midwestern United States. Wisconsin is the 25th-largest state by total area and the 20th-most populous. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake M ...

, 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, United States. As of the 2010 Census, the population was 1,614. History The town was established between 1848 and 1849 by Joseph and Ahio S. Watt, two brothers who had immigrated to Oregon over the Or ...

, US. *Sun Valley Garden Centr

Eden Prairie, 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