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, Morden, Manitoba 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, 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]

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.

Hybrids

'Jacan' was crossed with Ulmus 'Sapporo Autumn Gold', '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 City Council, UK, NCCPG National Elm Collection, UK champion: Sussex University campus, 15 m high, 31 cm d.b.h. in 2002, (listed as ''U. japonica'' 'Jacan').Johnson, Owen (ed.) (2003). ''Champion Trees of Britain & Ireland''. Whittet Press, . *Grange Farm Arboretum, Sutton St James, Spalding, Lincolnshire, Spalding, Lincolnshire, UK. Acc. no. not known. *Sir Harold Hillier Gardens, 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, Minnesota, US. ;Europe None known.

References

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