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