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With school out and summer underway, lawn care is becoming a regular chore in many households for the season. Hot, dry conditions can be stressful to cool-season grasses like Kentucky bluegrass, which should be mowed to three to three and a half inches during the summer. Also, when mowing never remove more than a third of the total leaf area at any one time. During hot, dry weather horticulturists with Iowa State University Extension and Outreach advise you can do nothing and let the grass go dormant, or you can water the turfgrass to maintain a green, actively growing lawn.