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Growth Of Grass: Once started, mow whenever growth of grass 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 of grass twice-a-week attention is necessary, and when growth of grass 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.
Steppe, or short-grass prairie, is an extensive grassland association that supports a rather continuous cover of low-growing grasses. Conditions are too dry for the growth of grass of tall grass or forest or, in the absence of irrigation, intensive crop production. Annual rainfall rarely exceeds 20 inches (500 mm) and is seasonal and variable. There is much sunshine and a wide daytime temperature range. Summers are warm, and winters may be cold with much wind. Buffalo grass (Buchloe dactyloides) and blue gamma grass (Bouteloua gracilis) are typical constituents of the American short-grass prairie. These grasslands, of low production due to climate, are widely used for nomadic and commercial grazing.
Crab grass seeds do not germinate until the weather is fairly warm. This is likely to be June in the northermost states, as early as March in southern California and similar mild regions. When they do start into growth of grass the plants increase in size at a prodigious rate and soon their broad, pale green leaves are clearly noticeable in the turf. As the crab grass spreads it gradually smothers desirable kinds of grass. The stems of the hairy crab grass root into the ground as they grow, those of the smooth-leaved kind do not.
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