A planter formed of concrete or a similar settable material includes an upwardly extending wall having a laterally closed outer surface and an upwardly extending inner surface bounding a hollow space having an upwardly extending axis. Three equiangularly spaced projections are formed on the outer surface of the planter. The outer edge of each projection extends perpendicularly of the projection axis which extends radially outwardly from the axis of the hollow space. Between the projections, the outer surface is formed of concavely shaped circular arcs.