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Prairie Expedition American Elm

Prairie Expedition® American Elm

Ulmus americana 'Lewis & Clark' (Family: Ulmaceae)

Description: Excellent cold hardy Dutch Elm Disease (DED) resistant American elm selection. The original tree was a lone survivor among other American elm trees that died from DED. Released and named in honor of the 200th anniversary of the Lewis and Clark Expedition in 2004.

Hardiness: USDA hardiness zone 3-9

Mature Size: Height: 60', Spread: 40'

Form (Shape): Umbrella-like form which typifies American elm.

Growth Rate: Medium to Fast; NDSU trials averaged 3 – 4’ of growth annually over 10 years of evaluation.

Foliage: Alternate, Simple, 3 – 6” long and 1 – 3’ wide;  Summer: High quality lustrous dark green; Autumn: Yellow

Texture: Medium

Flower: Greenish-red fascicles of 3 – 4 (perfect), not showy

Fruit: Rounded disc-shaped samara, not ornamental

Special Features: DED and wooly elm aphid resistant

Light Preference: Full sun exposure

Soil Preference: Prefers rich, moist soils but is highly adaptable to different soil types and pH.

Propagation: Softwood stem cuttings

Ornamental Attributes: High quality summer foliage.

Landscape Attributes: Prairie Expedition® is an outstanding DED resistant American elm selection. Uses for this cultivar are in boulevard, park plantings and other large open spaces.

Comments: Clonal trees were inoculated with DED and shown to be resistant to the disease. The original tree (pictured above) has a double leader, which makes the tree wider than what it would be if properly maintained as a single leader in the landscape.

Availability: Bailey Nurseries, J. Frank Schmidt & Son Co., Sester Farms Inc., Jeffries Nurseries Ltd. (Canada)

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