This is a cultivar of the American elm. Description Additional information Description. Habit Vase-shape Upright. Jefferson Elm has dark green foliage throughout the season. 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. The ‘Jefferson’ elm was previously thought to be a hybrid of the Ulmus americana and another species. Ulmus americana 'Jefferson' quantity. Full Sun. Ulmus americana 'Jefferson' Characteristics. The serrated pointy leaves turn an outstanding yellow in the fall. 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. Fast. 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 … Partial Sun/Shade. Landscape Attributes. Jefferson was developed at the US Arboretum in Washington, DC. Neither the flowers nor the fruit are ornamentally significant. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. 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). Drought Tolerant. 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. Phonetic Spelling ULM-us a-mer-ih-KAY-nah Description. 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. Attributes Fall Color. This is a cultivar of the American elm. 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. In nature. It has a vase shape similar to a Zelkova. It is native to eastern and central North America. Noteworthy Characteristics. Jefferson American Elm is a dense deciduous tree with a more or less rounded form. In Missouri, it typically occurs in low moist ground and along streams throughout the state (Steyermark). Ulmus americana ‘Jefferson’ Jefferson American Elm. Neither the flowers nor the fruit are ornamentally significant. It will serve your family just as faithfully. Jefferson American Elm has dark green foliage throughout the season. New Harmony (Ulmus americana 'New Harmony'): Excellent resistance to Dutch elm disease; vase-shaped habit. The serrated pointy leaves turn an outstanding yellow in the fall. it can be found in swamps, bottomland forests, moist slopes, and in areas with especially nutrient-rich soils. Landscape Attributes. The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree that grows along the National Mall in Washington D. Jefferson Elm is a dense deciduous tree with a more or less rounded form. Heat Tolerant. Foliage Color Green (dark) Landscape uses Specimen. 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