Ulmus 'Cathedral'

Infobox Cultivar | name = "Ulmus" hybrid


image_caption = 'Cathedral'. Photo: Ronnie Nijboer, Bonte Hoek kwekerijen.
hybrid = "U. pumila" × "U. davidiana" var. "japonica"
cultivar = 'Cathedral'
origin = WARF, Wisconsin, USA The elm hybrid cultivar 'Cathedral' is one of several clones derived from crossings of the Siberian Elm "U. pumila" with the Japanese Elm "U. davidiana" var. "japonica" at the University of Wisconsin-Madison and patented in 1994.

Description

The tree is distinguished from its siblings 'Sapporo Autumn Gold' and 'New Horizon' by its large, elliptical leaves, < 14 cm long by < 8 cm broad, almost the same size and shape of those of its male parent, the Japanese Elm, spinach green when mature, turning yellow and orange in autumn.Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. "Journal of Arboriculture" 21 (3): 121-131. International Society of Arboriculture, Champaign, Illinois, USA. ]

Pests and diseases

'Cathedral' is less resistant to Dutch elm disease than its siblings, although damage is usually confined to the branch tips. The leaves are also favoured by leaf hoppers and other insects that feed by piercing and sucking.Giblin, C. P. & Gillman, J. H. (2006). "Elms for the Twin Cities: A Guide for Selection and Maintenance." University of Minnesota.]

Cultivation

The tree requires quite high levels of maintenance owing to its predilection for breaks occasioned by branch inclusions. 'Cathedral' is widely available across the USA, and has been commercially released in Europe.

Etymology

The tree was named by Mr Donald Willeke of Minneapolis, who observed that where planted in tight rows, a series of gothic cathedral-like arches was ultimately created between the trees.

Accessions

North America

*Holden Arboretum acc. no. 91-202

Nurseries

North America

*Bailey Nurseries [http://www.baileynurseries.com/] , St Paul, Minnesota.
*Johnson's Nursery [http://www.johnsonsnursery.com/] , Menomonee Falls, Wisconsin
*Lee Nursery Inc. [http://www.leenursery.com/isite/subcat.cfm?CatID=270&CatName=Deciduous%20Trees&start=true] , Fertile, Minnesota
*Linder's Garden Center [http://www.linders.com/category/plants-products/trees/shade/] , St. Paul, Minnesota.
*Sherman Nurseries [http://www.shermannursery.com/latestavailability.htm] , Charles City, Iowa.

Europe

*Bonte Hoek kwekerijen [http://www.bontehoek.nl] , Glimmen, Netherlands.
*Conrad Appel nursery, Darmstadt, Germany.

References

External links

*http://www.extension.iastate.edu/Publications/SUL4.pdf Summary, inc. photographs, of elm cultivars resistant to Dutch elm disease available in the USA.