Gardens and Planter Boxes A simple Belvedere planter box. Wedgestone is used to separate the driveway and gardens. This unique feature breaks up the expanse of the front yard. A series of planters replace a traditional retaining wall. A Belvedere inukshuk A planter box is used to define the outside edge of a backyard patio. This circular planter provides a focal point along the walkway. Seats were built into the planter boxes to provide a rest stop for public strolling the park. Planters are an easy way to break up large retaining walls. Wedgestone can be used to create straight or curved walls.