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Thirty-four seedlots of western white pine (Pinus monticola Doug. ex. D. Don) were tested for frost hardiness to determine guidelines for seed transfer. Twenty-nine seedlots represented the coast and interior of British Columbia (BC), two were from coastal United States (US) and three from interior US. Detached needles were exposed to a series of freezing temperatures in a programmable freezer and relative hardiness was calculated as the length of injured needle expressed as a percentage of total needle length 10 days after freezing. Seasonal progress is hardening was tested using five dates in the autumn of 1989.
Thomas, B.R., Lester, D.T.; Worrall, J.. 1990. Guidelines for Seed Transfer of Western White Pine in B.C. Based on Frost Hardiness. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. FRDA Research Report. FRR125
Topic: FLNRORD Research Program
Keywords: Seedling, Performance
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