The

Japanese Elm Japanese elm is a common name for several plants and may refer to: * ''Ulmus davidiana'' var. ''japonica'' *''Zelkova serrata ''Zelkova serrata'' (Japanese zelkova, Japanese elm or keyaki or keaki; ja, 欅 (ケヤキ) keyaki /槻 (ツキ) tsu ...

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'' 'Jacan' is a cold-resistant selection from Canada. The tree was raised by the Morden Research Station, Morden,

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 o ...

in the 1980s

Description

'Jacan' develops a rounded crown form typical of the species; the foliage turns a deep red in autumn.Ronald, W. G. (1979). 'Jacan' Japanese Elm. ''Canadian Journal of Plant Science'', 59, 267–268 The species does not sucker from roots.

Pests and diseases

The tree is moderately 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 Americas, America ...

, and elm leaf beetle '' Xanthogaleruca luteola'

The tree's foliage was adjudged "resistant" to Black Spot (disease), Black Spot by the Plant Diagnostic Clinic of the

University of Missouri The University of Missouri (Mizzou, MU, or Missouri) is a public university, public Land-grant university, land-grant research university in Columbia, Missouri. It is Missouri's largest university and the flagship of the four-campus Universit ...

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Cultivation

'Jacan' has not been widely planted in Canada owing to restrictions imposed by the Canadian government on the movement of elms across the country, which severely limited its potential market. The tree was introduced to the UK (see Accessions) and Italy from Canada in the early 1980s, but was never in commerce in either country and thus remains very rare; it is not known to have been introduced to

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 ecologica ...

Hybrids

'Jacan' was crossed with 'Sapporo Autumn Gold' by the Istituto per la Protezione delle Piante, Florence; the selection identified as 'FL441'. Although it performed well in trials, being noted for its abundant foliage, 'FL441' was never patented or released to commerce. Santini, A, et al. Elm breeding for DED resistance, the Italian clones and their wood properties. ''Invest. Agrar: Sist Recur For'' (2004) 13 (1), 179–184.

Accessions

;North America None known. ;Europe *

Brighton & Hove Brighton and Hove () is a city and unitary authority in East Sussex, England. It consists primarily of the settlements of Brighton and Hove, alongside neighbouring villages. Often referred to synonymously as Brighton, the City of Brighton and H ...

City Council, UK,

NCCPG Plant Heritage, formerly known as the National Council for the Conservation of Plants and Gardens (NCCPG), is a botanical conservation organisation in the United Kingdom and a registered charity. It was founded in 1978 to combine the talents of b ...

National Elm Collection, UK champion: Sussex University campus, 15 m high, 31 cm

d.b.h. Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements. Tree trunks are measured at the height of an adult's breast, ...

in 2002, (listed as ''U. japonica'' 'Jacan').Johnson, Owen (ed.) (2003). ''Champion Trees of Britain & Ireland''. Whittet Press, . *

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) ' ...

, Sutton St James, Spalding,

Lincolnshire Lincolnshire (abbreviated Lincs.) is a county in the East Midlands of England, with a long coastline on the North Sea to the east. It borders Norfolk to the south-east, Cambridgeshire to the south, Rutland to the south-west, Leicestershire ...

, UK. Acc. no. not known. *

Sir Harold Hillier Gardens The Sir Harold Hillier Gardens is an arboretum comprising 72 hectares (180 acres) accommodating over 42,000 trees and shrubs in about 12,000 taxa, notably a collection of oaks, camellia, magnolia and rhododendron. The Gardens are located nor ...

, UK. Acc. nos. 1981.0133, 1982.4002 (listed as ''U. japonica'' 'Jacan').

Nurseries

;North America *Patmore Nurser

Brandon, Manitoba, Brandon, Manitoba, Canada. *Sun Valley Garden Centr

Eden Prairie Eden Prairie is a city southwest of downtown Minneapolis in Hennepin County and the 16th-largest city in the State of Minnesota, United States. As of the 2020 census, it has a population of 64,198. The city is adjacent to the north bank of th ...

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 22nd most populous, with over 5.75 million residents. Minnesota is home to western prairies, now given over to ...

, US. ;Europe None known.

References

{{Elm species, varieties, hybrids, hybrid cultivars and species cultivars , state=collapsed Japanese elm cultivar Ulmus articles with images Ulmus