After you have laid the radials let your grass grow to 2- 2 1/2 inches in height. Raise the mower to cut it that height and leave it like that all summer. You will have better looking grass, less weeds and you won't need to water it unless you have an extreme drought! No need to scalp your lawn, it stays healthier if you leave it long during the summer months. Been doing that for years and have not had any weed problems or grass that browns out. I never water it, waste of water. Less chance of a radial getting wound up in the mower blade too.