Watering at midday is less efficient because large amounts of water are lost through evaporation and strong winds may cause uneven water distribution. Strong midday winds may also carry the water onto driveways and streets and waste considerable amounts of water. Watering the lawn in the evening or at night may increase disease problems. Individuals wishing to establish a new lawn should prepare the site this summer. The best time to seed lawns in Iowa is mid-August through September.
Late summer is also an excellent time to overseed thin lawns.
As summer fades to fall, the cool season grasses will again have more favorable growing conditions. Good lawn care this summer will minimize stress and keep the turfgrass in good condition. Iowa State University , Ames, Iowa. This information subject to a usage policy .