Abstract
1. The effects of photoperiod on the growth of several tree species-American elm (Ulmus americana), flowering dogwood (Cornus florida), horse chestnut (Aesculus hippocastanum), red maple (Acer rubrum), sweet gum (Liquidambar styraciflua), tulip poplar (Liriodendron tulipifera), paulownia (Paulownia tomentosa), Asian white birch (Betula mandshurica), catalpa (Catalpa bignonioides and C. speciosa), and pine (Pinus taeda, P. virginiana, and P. sylvestris)-were investigated. 2. In general, short days induced dormancy, and long days prolonged growth. The various species differed in their response to short (8-hour) days, ranging from tulip poplar, which stopped further growth after about 10 8-hour days, to elm, which required 20 weeks of 8-hour days before the plants stopped elongating new structures. However, most of the species tested seemed to required about 4 weeks of 8-hour days before they stopped growing. At higher temperatures it took a greater number of 8-hour days to induce dormancy, and at temperatur...
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