Planter boxes are containers, usually made of wood or plastic, used for growing plants, flowers, or herbs. They are like small gardens that can be placed on a balcony, porch, or in a garden. Full definition
How To Paint Your Unfinished Wooden Planter Box For a Faux Distressed Gray and White Barnwood Look (momalwaysfindsout.com)
They had the cutest week - old guinea pigs there on Sunday, fluffy baby bunnies and broody chooks sitting in planter boxes on their eggs. (housegoeshome.com)
So to have a garden, we would have to setup out own planter boxes with fences and everything. (strengthandsunshine.com)