I am curious on some good ideas for a low maintenance (zero grass) and drought tolerant center island to a subdivision entrance. There will be no irrigation but there will be a service that weeds and waters every two weeks or so. The only landscaping that will stay are 5 bradford pears and the sign. It is approx 17'x100' island. Common trends? Common plants (zone 5, detroit MI area)? I have seen many that use a perimeter of crushed stone for protection etc... Thanks!