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. 2015 Mar 3;6:120. doi: 10.3389/fpls.2015.00120

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Copyright © 2015 Harrington and Gould.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Possibility lines separate combinations of chilling and forcing; points above or to the right of the lines indicate combinations where budburst is possible, points below or to the left of the lines indicate combinations where budburst is not possible. (A) Possibility lines for Douglas-fir, three species of true fir combined, three species of pine combined, western hemlock, and western larch. (B) Possibility lines for two groups of Pacific madrone (three seed sources from cool and three seed sources from warm climates) compared to the line for Douglas-fir; (C) Possibility lines for western redcedar based on trials from 2012 (12) and 2013(13) with the line for Douglas-fir shown for comparision. Points for the 2013 trial are plotted separately for the low elevation (13L) and the high elevation (13H) source.