Answer: In your growing region, cool season grasses such as ryegrass die out in hot weather and no amount of watering will bring it back. Most people have bermuda grass as a lawn, which is a warm season grass that stays green all summer. They overseed with perennial rye, a cool season grass, which greens up when temperatures cool down, which is when the bermuda begins to go dormant. So, to have a green lawn all summer you'll need to grow a warm season grass such as bermuda. Overseeding in the summer won't be too successful, but you can wait until October and overseed with a ryegrass mixture to green the lawn up until April. At that time the grass will brown out again and remain brown all summer long. The only permanent fix is to install a warm season grass such as bermuda - probably not an investment you'll want to make in a rental property.
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