Even if you have a fully grown lawn, it may not be as lush or green as you want it to be. There are a couple things you can do in order to make your lawn green as can be and at the optimum health. These key things to remember include mulching and fertilizing the lawn, as well as regulating the amount of water provided to it in order to establish deep roots.
Layer mulch about 1/2 inch thick on top of the grass if it is young in order to retain moisture and protect any grass seedlings from foraging birds. This also works for established lawns in summer, when the sun is very strong.
Choose a fertilizer that is lower in nitrogen but high in phosphorous or potassium. It is important to follow the directions on the fertilizer package, because how you apply it depends on your climate, the grass type and fertilizer. Fertilizer will help your grass become strong and healthy, and also make the roots well-established.
Water the grass once a week in the evening for about 20 minutes, which will help to establish deep roots. Watering frequently and in small amounts makes the grass roots shallow, which allows weeds to grow and choke out the grass, making it less healthy and green.
Care for your grass so it isn't constantly treaded on or ripped up by accident from sports or animals. When grass is constantly tramped on, it weakens the roots and rips up the blades. To prevent this, especially if the grass is young, put up a fence or sign to restrict activity on the lawn.