Abstract: A planting flat consisting of a unitary plastic body providing a multiplicity of planting cells having open upper ends adapted to receive growing medium, seeds, water, fertilizer, and the like; closed lower ends defining reservoirs for the retention of residual water and fertilizer accessible to the roots of plants grown in the cells; and aerating openings disposed above the reservoirs serving the combined purposes of supplying air to the growing medium and providing drainage of water and fertilizer in excess of an amount sufficient to fill the reservoirs.