Landscape Attributes. Jefferson Elm has dark green foliage throughout the season. 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. 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. 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.It is native to eastern and central North America. Habit Vase-shape Upright. 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. Ulmus americana 'Jefferson' quantity. Landscape Attributes. Ulmus americana ‘Jefferson’ Jefferson American Elm. 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). Phonetic Spelling ULM-us a-mer-ih-KAY-nah Description. Add to cart. Drought Tolerant. It is native to eastern and central North America. Heat Tolerant. 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. It will serve your family just as faithfully. The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree that grows along the National Mall in Washington D. Noteworthy Characteristics. New Harmony (Ulmus americana 'New Harmony'): Excellent resistance to Dutch elm disease; vase-shaped habit. Foliage Color Green (dark) Landscape uses Specimen. it can be found in swamps, bottomland forests, moist slopes, and in areas with especially nutrient-rich soils. In nature. It has a vase shape similar to a Zelkova. 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 … Fast. This mature tree is instantly recognizable, with a broad vase-shaped canopy, sturdy trunk and … Planted in the 1930s, the original specimen had survived DED. Attributes Fall Color. This is a cultivar of the American elm. The serrated pointy leaves turn an outstanding yellow in the fall. Ulmus americana 'Jefferson' Characteristics. Handsome Jefferson American Elm (Ulmus americana 'Jefferson') was cloned from an impervious specimen found standing proudly on the Washington Mall. Jefferson American Elm has dark green foliage throughout the season. The ‘Jefferson’ elm was previously thought to be a hybrid of the Ulmus americana and another species. Full Sun. Soil Moisture Well-drained Average to Dry Soils Moist to Average. Neither the flowers nor the fruit are ornamentally significant. Jefferson was developed at the US Arboretum in Washington, DC. Jefferson Elm is a dense deciduous tree with a more or less rounded form. Neither the flowers nor the fruit are ornamentally significant. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. Jefferson American Elm is a dense deciduous tree with a more or less rounded form. Partial Sun/Shade. Browse pictures and read growth / cultivation information about Description Additional information Description. 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