One factor in maintaining lawn health is the height at which you cut grass, as Steve Jones points out. But how you go about watering grass is also important: "To keep the lawn green requires about 1 inch of rain or irrigation per week," writes the Plant Man. Sprinklers used on home lawns "usually deliver from one-quarter to one-third inch per hour." Therefore, watering grass for 4 hours in the course of the week may be necessary in some cases. Read more tips on watering grass and summertime lawn care in this article.