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Soft Growth: Adding raw sugar to the water, or pennies, or diet soda does nothing except help the growth of bacteria, thus clogging stems so they cannot take up water. The University of California at Davis conducted an experiment in which a lemon-lime soft growth drink was added to water (1 part soft growth drink to 2 parts water) and tests did show that flowers lasted far longer than in plain water. The sugar in the soda apparently feeds the flowers and the acidity inhibits bacterial growth. The same results can be had by mixing 1 tablespoon of corn syrup and 10 drops of ' bleach in a quart of warm water. (Forgive an old curmudgeon, but that seems like undue effort to keep flowers fresh, with an active cutting garden in the backyard.) Commercial preparations are also available, but I've never tried them.
Lateral growth in trees frequently begins later than growth in height, but the period of lateral growth is longer. Rates of lateral growth likewise are low at the outset, increasing after a few weeks and then diminishing. In view of the long annual period of lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In the wood of trees of temperate regions, narrow and wide growth rings may be observed, marking years characterized by unfavorable and favorable conditions for growth.
Growth Cycles.—Longitudinal and lateral (diametral) growth do not proceed continuously, but rather are cyclical phenomena with periods of growth activity alternating with periods of relative inactivity. One of the best illustrations of the periodic nature of growth in large woody stems is to be found in the annual ring pattern which characterizes the wood of trees of temperate regions. It has been suggested recently that even in the apparently ever-growing trees of the tropical rain forest, cambial growth is not a continuous process.
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