Abstract
NUMEROUS attempts have been made to relate the year-to-year variability in flowering of forest trees to seasonal fluctuations in weather conditions which, in turn, are believed to influence the internal physiological processes regulating flower initiation1. The pronounced effect of photoperiod on flowering, noted in many herbaceous species, appears to be lacking in forest trees, and observations indicate that most trees are photoperiodically day-neutral2,3. However, until more definitive experiments have been undertaken, photoperiod cannot be ruled out as a factor influencing flower formation.
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LARSON, P. Influence of Date of Flushing on Flowering in Pinus banksiana. Nature 192, 82–83 (1961). https://doi.org/10.1038/192082a0
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DOI: https://doi.org/10.1038/192082a0
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