Growth device for crop, use of such a device, and a series of growth devices

A growth device for crop, comprising a panel-shaped structure, a substrate included in the panel-shaped structure for receiving crop, and at least one water reservoir included in the panel shaped structure, wherein the water reservoir extends substantially above a bottom side of the substrate in a vertical position of use of the growth device, the growth device further comprising connecting means to bring the water reservoir in communication with the substrate for moistening the substrate, wherein the connecting means comprise a bottom reservoir extending substantially under the substrate, and wherein the connecting means are further provided with a water flow regulator to regulate water flow from the main water reservoir to the bottom reservoir extending substantially under the substrate,

• wherein an underside of the substrate facing the bottom of the growth device is in direct contact with water present during use in the bottom reservoir, such that this water can be sucked up into the substrate, and/or wherein the substrate is provided with water suction means which reach from the substrate into the bottom reservoir to draw water therefrom.