The invention relates to a plate-shaped structure for cultivating one or more plants. The plate-shaped structure may optionally collect moisture from the atmosphere and comprises a generally flat upper surface provided with a cavity for holding plant material. The cavity has a sidewall and a bottom portion. Further, the bottom portion includes an aperture traversing the plate-shaped structure. In use, the plate shaped structure can cover a reservoir or can be placed on the soil. The plate-shaped structure comprises a drain opening with a cap that is heavier than water and a covering cap so as to allow moisture to seep between the cap and the sidewall of the drain opening while minimizing evaporation.
