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Ulmus 'Morton' (selling name Accolade) is an elm cultivar cloned from a putative intraspecific hybrid planted at the Morton Arboretum in 1924, which itself originated as seed collected from a tree at the Arnold Arboretum in Massachusetts.
The tree is also extremely tolerant of drought [8] and cold; in artificial freezing tests at the Morton Arboretum [9] the tree was found cold-hardy to −40°C. Commendation was introduced by Chicagoland Grows [10] [3] and is currently being evaluated in the National Elm Trial [11] coordinated by Colorado State University. The tree was ...
Danada Charm is very cold hardy; in artificial freezing tests at the arboretum [8] the LT50 (temp. at which 50% of tissues die) was found to be −31 °C.However, the tree is notorious for its stem breakage owing to narrow crotch angles and included bark; in trials at the University of Minnesota it had the unhappy distinction of being the worst of 17 cultivars for breakage. [9]
The American Elm cultivar Ulmus americana 'Valley Forge' was raised by the Agricultural Research Service in Maryland. The tree was released to wholesale nurseries without patent restrictions by the U. S. National Arboretum in 1995 after proving to have a high resistance to Dutch elm disease. 'Valley Forge' proved only moderately successful in ...
'Moline' was susceptible to Dutch elm disease. [11] In trials at the Morton Arboretum, Illinois, the tree was eschewed by the Elm Leaf Beetle Xanthogaleruca luteola. [12] No other specific information available, but the species as a whole is highly preferred for feeding by the Japanese Beetle Popillia japonica.
The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. [1] The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an ...