A planter includes an interior surface and a riser extending from a bottom of the interior surface and including a space between the riser and lateral walls of the planter. The riser includes an open-top recess formed in a top portion of the riser. A plate including a protrusion extending from a bottom side of the plate and forming an open-top reservoir on a top side of the protrusion. The protrusion is configured to be coupled with the recess to secure the plate to the riser.