Watering is essential for growing healthy grass. Although grass does not need to be watered every single day to stay healthy, it needs at least 1" to 1.5" of water per week throughout the year. If it is watered lightly, then its roots will not be deep enough to stay strong. The question here is, how long should you water grass? It doesn't matter if the grass is on a flat or sloped surface (in fact, for landscaping a steep slope, you should head over to Carve Your Creation). Here are a few...