So, what should you do when your lawn is dormant or going dormant? "Try to let Mother Nature do her thing," says Mann. Note that when dormancy ends, grass leaves that have turned brown won't revive, but new leaves will appear. The grass will break dormancy and begin growing again when the temperatures and/or rainfall levels become more ideal for it. It's your lawn's way of conserving energy and water, Mann explains. Grass can turn brown and go dormant when it's stressed by drought, heat, or both. Related: Lawn-Care Mistakes to Stop Making So You Can Have Healthier Grass Their growth increases as the temperatures rise. Warm season grasses in the south do the opposite. In the northern U.S., Mann says cool-season grasses grow more slowly when the temperatures rise. Grasses like Bermuda and Zoysia are warm season grasses that tolerate more heat. Fescue, for example, is a cool season grass that grows best in spring and fall, when temperatures are lower. Some species grow better in cool seasons and some in warm seasons. It's one of their evolutionary benefits," he adds. "Most grasses are well-adapted to drier conditions. "Turf grasses can withstand far more drought than we might think," says Bob Mann, an agronomist with NALP ( National Association of Landscape Professionals). Of course, forgoing sprinklers or turning off your irrigation system when the weather turns hot and dry in the summer will usually result in a brown, crispy lawn but that doesn't mean your grass is dead or dying.
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