Prairie Expedition® American Elm -- Ulmus americana ‘Lewis & Clark' (RFM-37)
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.
USDA hardiness zone 3-9
Height: 60', Spread: 40'
Umbrella-like form which typifies American elm.
Medium to Fast; NDSU trials averaged 3 – 4’ of growth annually over 10 years of evaluation.
Alternate, Simple, 3 – 6” long and 1 – 3’ wide; Summer: High quality lustrous dark green; Autumn: Yellow
Greenish-red fascicles of 3 – 4 (perfect), not showy
Rounded disc-shaped samara, not ornamental
Full sun exposure
Prefers rich, moist soils but is highly adaptable to different soil types and pH.
Softwood stem cuttings
High quality summer foliage.
Prairie Expedition® is an outstanding DED resistant American elm selection. Uses for this cultivar are in boulevard, park plantings and other large open spaces.
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.
U.S. Trademark registered – Prairie Expedition®
Canadian Trademark registered
This cultivar is available for non-exclusive licensing.
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