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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 zones 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 Preferences: Full sun exposure Soil Preferences: 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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  • 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 zones 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 Preferences: Full sun exposure

    Soil Preferences: 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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