Ulmus pumila 'Green King'

Infobox Cultivar | name = "Ulmus pumila"
cultivar = 'Green King'
origin = USAThe elm cultivar "Ulmus pumila" 'Green King' was once believed to have been derived from a crossing of the Siberian Elm "Ulmus pumila" with the American Red Elm "Ulmus rubra". However, it appears the tree originated as a sport of "U. pumila" in 1939 at the Neosho Nurseries, Neosho, Missouri Green, P. S. (1964). Registration of cultivar names in Ulmus. "Arnoldia", Vol. 24. Arnold Arboretum, Harvard University. [http://arnoldia.arboretum.harvard.edu/pdf/articles/1605.pdf] ] .

Description

The tree typically forms a wide base and conical crown [http://www.starkbros.com/access?action=product&productID=4477&collection=0] , not dissimilar to the European Hornbeam "Carpinus betulus" 'Fastigiata' (yclept 'Pyramidalis').

Pests and diseases

See under "Ulmus pumila".

Cultivation

'Green King' is perhaps most notable for its extraordinary rate of growth, claimed to be from 2.5 m (8') to 3.4 m (11') per annum, and its resistance to wind and drought.The tree featured in the elm trials [http://www.for.nau.edu/cms/content/view/512/706/] conducted by Northern Arizona University at Holbrook, where it was noted that "the hybrid (sic) had not been widely tested for resistance to DED (Dutch elm disease)". Its performance in the Arizona trials seems to have been insufficently good or bad to warrant any further comment. Although the tree remains commercially available in the USA, it is no longer widely planted, having been eclipsed by later developments such as 'Homestead' and disease-resistant cultivars of the American Elm "U. americana". Moreover, its planting, as a clone of the Siberian Elm, is prohibited in Nevada and Oregon. The tree is not known to have been introduced to Europe or Australasia.

ynonymy

*"Ulmus" 'Broadleaf Hybrid': Kammerer, E. L. in "Bull. Pop. Inf. Morton Arb." 36 (5): 25, 1961.
*"Ulmus" 'Field's New Hybrid Elm': Henry Field Seed & Nursery Co., Shenandoah, Iowa, (who renamed the tree 'Green King' circa 1960).
*"Ulmus" 'Green King': Morton Arboretum Catalogue, 2006.
*"Ulmus" 'Neosho'

Accessions

North America

*Morton Arboretum acc. no. 78-69, (listed simply as "Ulmus" Green King).

Nurseries

North America

*Stark Bros Nurseries & Orchards Co., Louisiana, Missouri [http://www.starkbros.com/access?action=product&productID=4477&collection=0]

References

External links

*http://www.ag.ndsu.nodak.edu/aginfo/trees/handbook/th-3-117.pdf Siberian Elm and its derivatives.