Abstract: An improved device for continuously watering plants growing in flower pots or boxes, comprising a body formed by the combination of at least two shells which have a similar geometric configuration and are disposed one within the other and the side walls of which are oppositely inclined with respect to the verical direction in a manner such that they are converging toward each other from the bottom to the top thereof while the top edges of said side walls are interconnected by a generally horizontal top wall. Said shells and said top wall define a hollow space within said body while surfaces of said shells opposite the surfaces defining said hollow space are forming outer and inner walls of said body. The concentrically inner shell is provided with a series of apertures at the bottom free edge thereof.