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The American Elm cultivar Ulmus americana 'Penn Treaty' was raised by the Plant Sciences Data Center of the American Horticultural Society.Plants under that name were propagated by the Morris Arboretum, Pennsylvania, Philadelphia, from grafts made in 1945 from a tree at Haverford College, itself a graft, planted in 1840, from the Shackamaxon Treaty Elm – the tree under which William Penn ...
The Field Elm cultivar Ulmus minor 'Atinia Variegata', the Variegated-leaved common English Elm, [1] formerly known as U. procera 'Argenteo-Variegata' [2] and described by Weston (1770) as U. campestris argenteo-variegata, [3] is believed to have originated in England in the seventeenth century [4] and to have been cultivated since the eighteenth. [2]
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.
Rows of American elm trees line a path south of the Lincoln Memorial Reflecting Pool on the National Mall in Washington, DC (November 11, 2006) Several rows of American elm trees that the National Park Service (NPS) first planted during the 1930s line much of the 1.9-mile-length (3 km) of the National Mall in Washington, DC. DED first appeared ...
'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.
A rare example of a centuries-old field elm that retains its heartwood and crown is the 360-year-old specimen in the village square of Strinylas, Corfu. [32] [33] [34] A tree said to be of similar age (200 cm d.b.h.) still stands (2013) in the city of Sliven, Bulgaria; other veterans are said to survive in the village of Samuilovo, 7 km from ...
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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 ...