The invention relates to a device for moistening and/or fertilizing plants (1), comprising a movable spray lance (3) with at least one spray nozzle (4) arranged on the spray lance (3), wherein a preferably linear guide rail (2) is provided, wherein the spray lance (3) is guided in the guide rail (2) so as to be movable in a trajectory running parallel to the guide rail (2) and extends substantially normally with respect to said trajectory, and a drive, preferably a linear drive (11), for moving the spray lance is arranged in the region of the guide rail (2). The invention also relates to a system for the substrate-free cultivation of plants comprising the device according to the invention.
