Green Canyon™ Rocky Mountain Douglas Fir -- Pseudotsuga menziesii var. glauca 'Winterscape’ (RFM-67)
Douglas fir is subdivided into two major botanical varieties, namely var. menziesii, restricted to forests of the Pacific Norhwest - especially the Sierra and Cascade Mountain ranges. This variety is rarely sufficiently winter hardy in the interior northern U.S., often suffering severe winter burn dieback. The variety glauca, native to the vast Rocky Mountain region, is significantly more winter hardy and quite drought tolerant. In the Northern Plains, only the variety glauca should be planted. Green Canyon™ was named for its significantly greener foilage color, compared to most Rocky Mountain Douglas firs. It is attractive year-round, including the winter landscape. It is very densely-pyramidal in form. Growth rate is similar to common spruce and pine species. Tannish-brown cones average 2 1/4 to 2 3/4 inches long with extended 3-pronged bracts protruding between the scales. Needles average 3/4 - 1" long. Douglas fir can be propagated by rooting hardwood cuttings, by side grafts or top-cleft grafts, but scion-stock incompatibility sometimes complicates graft success. Wholesale nurseries are encouraged to propagate and commercialize this superior, adapted cultivar.
Potential Uses or Applications
Nursery stock, residential, parks and other public grounds and shelter landscape specimen tree
Plant propagation material can be obtained from NDSU Plant Sciences Department or trees from licensed nursery subject to availability.
U.S. Trademark - Green Canyon™
This cultivar is available for non-exclusive licensing.
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