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