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Whenever Growth Necessitates: Once started, mow whenever growth necessitates. With most grasses as soon as they are half to three quarters of an inch to one inch higher than established cutting height. This may mean once a week at times, but in periods of rapid growth twice-a-week attention is necessary, and when growth is slow more time may elapse between mowings. It pays to mow frequently and to take a little each time rather than a lot. Don't let the grass get so high before mowing that after cutting it looks yellowish or brownish. This is an invitation to crab grass; diseases and pests. If bad weather prevents mowing before the grass is conspicuously longer than proper, raise the cutting height a little at the first mowing and gradually bring it to normal at subsequent cuttings.
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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