U.S. National Arboretum Plant Introduction Floral and Nursery Plants Research Unit Visit us on the web: www.usna.usda.gov December 2010 The U.S. Department of Agriculture is an Equal Opportunity Employer. Ulmus americana 'Jefferson' quantity. Foliage Color Green (dark) Landscape uses Specimen. The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree that grows along the National Mall in Washington D. Jefferson American Elm has dark green foliage throughout the season. Jefferson was developed at the US Arboretum in Washington, DC. Neither the flowers nor the fruit are ornamentally significant. Jefferson Elm is a dense deciduous tree with a more or less rounded form. However, scientists from the National Arboretum have determined the ‘Jefferson’ elm on the National Mall is a true varietal of the species instead of a hybrid. it can be found in swamps, bottomland forests, moist slopes, and in areas with especially nutrient-rich soils. The serrated pointy leaves turn an outstanding yellow in the fall. Ulmus americana 'Jefferson' Characteristics. Heat Tolerant. Ulmus americana, commonly called American elm, is a medium to large deciduous tree, typically growing to 60-80’ (less frequently to 130’) tall with a vase-shaped, broad-rounded crown. Phonetic Spelling ULM-us a-mer-ih-KAY-nah Description. This mature tree is instantly recognizable, with a broad vase-shaped canopy, sturdy trunk and … Landscape Attributes. Planted in the 1930s, the original specimen had survived DED. Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, is a species of elm native to eastern North America, naturally occurring from Nova Scotia west to Alberta and Montana, and south to Florida and central Texas.The American elm is an extremely hardy tree that can withstand winter temperatures as low as −42 °C (−44 °F). Botanical Name: Ulmus americana 'Jefferson' Numbers (NA 62001; PI 635109; NPS 3-487) Family Ulmaceae Hardiness: USDA Zones 4-7 Development: 'Jefferson' was originally selected by … Full Sun. This is a cultivar of the American elm. Partial Sun/Shade. Description Additional information Description. It will serve your family just as faithfully. More tidy than some of the other improved American Elm selections, this tree is not as awkward in it’s youth as some other varieties. Jefferson Elm has dark green foliage throughout the season. Ulmus americana, or American Elm, is a deciduous tree, native to North Carolina, that can grow to 80 to 100 feet tall with a trunk diameter of 2 to 5 feet.Older trees sometimes develop buttresses that expand their base. Ulmus americana ‘Jefferson’ Jefferson American Elm. New Harmony (Ulmus americana 'New Harmony'): Excellent resistance to Dutch elm disease; vase-shaped habit. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. This is a cultivar of the American elm. Soil Moisture Well-drained Average to Dry Soils Moist to Average. Habit Vase-shape Upright. Drought Tolerant. Handsome Jefferson American Elm (Ulmus americana 'Jefferson') was cloned from an impervious specimen found standing proudly on the Washington Mall. It is native to eastern and central North America. Fast. Attributes Fall Color. In nature. Landscape Attributes. Noteworthy Characteristics. The serrated pointy leaves turn an outstanding yellow in the fall. The ‘Jefferson’ elm was previously thought to be a hybrid of the Ulmus americana and another species. Neither the flowers nor the fruit are ornamentally significant. 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