A planting container body (1) has a bottom wall (3) and side walls (4) forming a planting space (2) and also has a water-holding section for holding planting water supplied to the planting space (2). The water-holding section has a water discharge opening (12) for overflow. In a horizontal position (A) in which the planting space (2) opens upward, the bottom wall (3) and the side walls (4) form a horizontal water-holding section for holding planting water. In a vertical position in which the planting space (2) opens sideways, a vertical water-holding section for holding planting water is formed by the bottom wall (3), side walls (4), and a dam section (8) formed facing the bottom wall (3) on the side wall (4) that is the bottom surface. A water discharge start section of the water discharge opening (12) is located at a position a predetermined distance away from the bottom wall (3) and a predetermined distance away from a side wall (4).
