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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.
Ulmus americana. 'Princeton'. Mature Princeton Elms on the right, planted in the 1920s, with Delaware Elms planted in 1983 on the left. One of the side allées of the Washington Road Elm Allée in Princeton, New Jersey, United States. The American Elm cultivar Ulmus americana ' Princeton' was originally selected in 1922 by New Jersey nurseryman ...
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'. 'New Harmony' proved the most successful U. americana cultivar in the US National Elm Trial, averaging a survival rate of 85.5% overall.
The Johnstown Elm, in Johnstown, New York, as of September 2013 did not show any signs of Dutch elm disease. In October 2018 all that remained was a weathered stump, cut perhaps two years earlier. It had a circumference of 196 inches (16.3 ft; 5.0 m), a height of 85 feet (26 m), and a crown of 88 feet (27 m).
Ulmus thomasii, the rock elm [3] or cork elm (or orme liège in Québec), is a deciduous tree native primarily to the Midwestern United States. The tree ranges from southern Ontario and Quebec , south to Tennessee , west to northeastern Kansas , and north to Minnesota .
Cultivar. 'American Liberty'. Origin. ERI, US. The American elm cultivar Ulmus americana ' American Liberty' is in fact a group of six genetically distinct cultivars under a single name, although they are superficially similar. [1] The Liberty elm is reportedly suitable for street planting, being tolerant of de-icing salts and air pollution.