You mean height. Some grass species can be as tall as over 9 feet like bamboo or elephant grass. Other grasses grow up to 6 feet in height. Lawn grasses, on the other hand, never see a height of more than 4 to 5 inches before they are cut to 1.5 to 3 inches tall.
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It depends on your grass type but it is best to mow longer than you normally would in the summer (for most grasses about 3 inches) so that the root system of your grass goes deeper into the soil to get more ground water.