This tip comes from reader Tony DeRiggi: “Mow your lawn so grass is at least 3 inches high. Taller grass will shade the roots and reduce soil moisture evaporation and shade will also reduce weed growth.”
By promoting moisture retention in the soil, that longer lawn really does save water. It needs less irrigation each week and also helps grass develop drought tolerance. Mowing higher prompts plants to grow deeper roots, which helps them gather more moisture. It also makes for an overall healthier lawn. Another bonus: It’s less work! You don’t have to mow as often. So, save time – and water – and let the grass grow.