An attempt was made to examine the hypothesis that the annual course of cambial activity is a permanent feature of each woody plant, related to its phytogeographic origin. Existing data on cambial activity in woody plants growing in Israel have been presented in a comprehensive diagram which shows a correlation between the course of activity and the phytogeographic origin of the various plants. Some attempts to prevent the occurrence of a period of cambial dormancy in plants which normally have such a period were unsuccessful.
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