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Ulmus americana 'New Harmony'
The American Elm cultivar ''Ulmus americana'' 'New Harmony' was raised by the Maryland Agricultural Research Service and released by the United States National Arboretum in 1995, along with 'Valley Forge'.
==Description==
'New Harmony' is considered by some to have a more desirable form than 'Valley Forge' as it grows vertically on its own with a minimum of early training. The original parent tree (located on a roadside in Ohio) is already over 20 m high, with a slightly greater crown spread. The bole divides into several erect branches about 10 m above the ground terminating in slender, pendulous branchlets.〔Townsend, A. M., Bentz, S. E., and Douglass L. W. (2005). (Evaluation of 19 American Elm Clones for Tolerance to Dutch Elm Disease ). ''Journal of Environmental Horticulture'', March 2005, Horticultural Research Institute, Washington, D.C.〕
Growth is rapid, young trees gaining in height by almost 1.7 m per annum in trials at U C Davis, although d.b.h. increase remained a modest 1.8 cm.〔McPherson, G. ''et al''. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, pp 32-36.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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