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Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures, but it is affected by Dutch elm disease.
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 ' Lewis & Clark' (trade name Prairie Expedition) is a development from the North Dakota State University (NDSU) Research Foundation breeding programme, released in 2004 to commemorate the 200th anniversary of the eponymous expedition. [1] The cultivar was cloned from a tree discovered in 1994 along the ...
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.
It was steadily weakened by viruses in Europe and had all but disappeared by the 1940s. However, the disease had a much greater and longer-lasting impact in North America, owing to the greater susceptibility of the American elm, Ulmus americana, which masked the emergence of the second, far more virulent strain of the disease Ophiostoma novo-ulmi.
Ulmus americana. 'St. Croix'. The American Elm cultivar Ulmus americana ' St. Croix' is a recent (2008) selection cloned from a large tree growing on a farm near Afton, Minnesota, [1] which has displayed a high resistance to Dutch elm disease (DED). [2] A U S patent, PP 20097, was granted in 2009.
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.
The American Elm cultivar Ulmus americana 'Vase' was selected and propagated in the early 20th century by the Klehm Nurseries, Arlington Heights, Illinois, who advertised it at first as Ulmus americana 'Urnii', 'Klehms' American Vase-Shaped Elm', listing it, along with its stablemate Ulmus americana 'Moline', as a "novelty" in 1926, and describing both in some detail.