Prairie Expedition® American Elm -- Ulmus americana ‘Lewis & Clark' (RFM-37)

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 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.

Patent Status:

U.S. Trademark registered – Prairie Expedition®

Canadian Trademark registered

Licensing Status:

This cultivar is available for non-exclusive licensing.

Downloads:

Download the PDF Datasheet (PDF, 268.07 KB)

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