Abstract: An apparatus for hydroponics comprising (a) a box made of cardboard comprising a bottom wall, a surrounding wall and a cover, wherein the surrounding wall comprises at least two sheets and a space is formed between the two sheets, and the cover consists of at least two parts which can be separately opened and closed, and at least one of the parts has at least one opening; (b) a container made of water-impermeable material which can be contained in the box; and (c) a porous solid medium for plant culture comprising a culture bed which can be contained in the water-impermeable container and at least one plant support, wherein the plant support protrudes through the opening of the cover part of the apparatus, beyond the cover part, and an upper surface of the culture bed and an inner surface of the cover define a space therebetween; and the use thereof.