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American elm is a vase-shaped, medium to large, deciduous tree. [4] The tree can grow to greater than 30 m in height, and is distinguished by its dense, symmetrical, upright form and dark green foliage, ultimately forming a broad umbrella crown. Crotch angles can be acute, with considerable bark inclusion which can later lead to branch breakages.
The American elm is a deciduous tree which, under ideal conditions, can grow to heights of 21 to 35 meters (69 to 115 feet). [3] The trunk may have a diameter at breast height (dbh) of more than 1.2 m (4 ft), supporting a high, spreading umbrella-like canopy.
The Japanese Elm cultivar Ulmus davidiana var. japonica ' Discovery' is a cold-resistant selection from Canada, raised along with 'Freedom' in the 1980s by Dr Wilbert Ronald, of Jeffries Nurseries Ltd. and Rick Durand of Shade Consulting Services, Portage la Prairie, Manitoba.
The tree is named for Christine Buisman, the first full-time elm researcher (1927-1936) in the Netherlands, who provided the final proof that Graphium ulmi Schwarz (now: Ophiostoma ulmi (Buisman) Melin & Nannf.) was the causal agent of Dutch elm disease. Buisman died in 1936, aged 36. [citation needed]
Ulmus pumila, the Siberian elm, is a tree native to Asia.It is also known as the Asiatic elm and dwarf elm, but sometimes miscalled the 'Chinese elm' (Ulmus parvifolia). U. pumila has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United States.
Ulmus parvifolia, commonly known as the Chinese elm [2] or lacebark elm, is a species native to eastern Asia, including China, India, Japan, Korea, Vietnam, [3] Siberia and Kazakhstan. [4] It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus ".
Ulmus parvifolia 'BSNUPF ' (selling name Everclear) is a Chinese Elm cultivar, cloned from a chance seedling at Bold Spring Nursery, Bold Spring, Georgia. Patented in 2007, [ 1 ] it was raised by John Barbour of Athena Trees, Monroe , Georgia .
The Chinese Elm cultivar Ulmus parvifolia 'Hallelujah' is one of three American introductions made circa 1992 that were selected for their cold hardiness (USA zone 4 tolerant). 'Hallelujah' is known to have withstood -37 °C (-35 °F) in Missouri. The tree was first listed by the Arborvillage Nursery, Holt, Missouri, in its 1993–1994 ...