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Increasing Cold Hardiness of Container - Grown Douglas-Fir Seedlings

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Containerized Douglas-fir (Pseudotsuga menziesii [Mirb] Franco) seedlings, grown for 6 months in a greenhouse then hardened in five different ways, were out-planted at 3,500 ft. elevation. Those hardened under an eight-hour short-day test condition, or in a lath house (half-sunlight), suffered the least winter frost damage; other seedlings subjected to two field hardening treatments at the high-elevation site (those hardened under open-field or shaded-field conditions) as well as seedlings held in a cold-room were killed or injured by repeated winter frosts. The short-day seedlings were also shown to be hardiest at time of planting. The two-month short-day greenhouse treatment applied in late summer sufficiently induces cold hardiness in Douglas-fir container stock of high elevation origins to allow early fall planting.
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Document Type: Journal Article

Affiliations: Forest Nursery Ecologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Washington

Publication date: 1974-06-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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