Ulmus davidiana var. japonica 'Discovery'
From Wikipedia, the free encyclopedia
| Ulmus davidiana var. japonica |
|---|
| Cultivar |
| 'Discovery' |
| Origin |
| Canada |
The Japanese Elm Ulmus davidiana var. japonica cultivar 'Discovery' is a cold-resistant selection from Canada. It was 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, Manitoba. It has an oval form, with vase-shaped branching, supporting dark green foliage turning yellow in autumn. The tree grows to over 15 m in height, with a spread of much the same dimension. It is resistant to Dutch elm disease and elm leaf beetle. However, it performed very poorly in government trials [1] in Alberta, Canada, failing completely at five out of six sites. Moreover, the two trees that survived developed a very poor branching pattern requiring pruning to strengthen crotches. 'Discovery' fared better in trials conducted by the University of Minnesota, 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 [1]. Nonetheless, a number of trees have been established in the Minneapolis Parks system.
The tree is not known to have been introduced to Europe or Australasia.
Contents |
[edit] Arboreta etc. accessions
[edit] North America
- Brenton Arboretum, Dallas Center, Iowa. No details available.
- Smith College, acc. no. 4703.
[edit] Nurseries
[edit] North America
- Bailey Nurseries [2], St. Paul, Minnesota.
- Jeffries Nurseries [3], Portage la Prairie, Manitoba.
- Johnson's Nursery [4], Menomonee Falls, Wisconsin
- Lee Nursery Inc. [5], Fertile, Minnesota
- Linder's Garden Center [6], St. Paul, Minnesota.
- Minnesota Valley Nurseries [7], Shakopee, Minnesota.
- Patmore Nursery [8], Brandon, Manitoba.
[edit] References
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
[edit] 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.
