Wiktionary
n. A flower box; an object that contains live flowers, usually affixed outside, just below a window.
Usage examples of "planter box".
Finally he stood up from the planter box, clicked on his interphone, and told Ann that he was ready.
To make one, take a long narrow wooden box, shaped like a planter box, and nail a metre-high piece of wood to one side.
The storefront sported two windows, each with its wooden planter box crammed with aromatic flora, and when we opened the shop door, we were almost bowled over by the hodgepodge of scents.
Tommy sat at a patio table with only a low brick planter box between him and the sidewalk.
He took his time and snuffed the end out thoroughly in the planter box.
She was perched on the planter box at the base of the steps, silver hair gleaming in the summer sunshine, her expression a mix of amusement and curiosity.
Two wicker chairs adorned the porch of which held a profusion of pink petunias in a wooden planter box cascading over the spindles.