Our lawn has been in place for fifty years and looks good other than dandelions which we get rid of as needed. In our far north climate with rich soil grass does well without a lot of extra work and looks good most of the season except when it is extremely hot and dry when it goes partially dormant until it rains then it is green in a few days it is a mixture of grass seed meant for northern climates. We have never had weeds take over or grass die out and we have lived here the entire time, most of the lawn is thick except for some heavy shade areas that are not quite as thick and heavy. When we started our lawn from seed all those years ago it did get a lot of maintenance care including watering, regular fertilizing and weeding to get it well established.