A portable device and a method for the decorative design of fields and grass surfaces with graphics, texts, logos, reliefs, engraved designs, or patterns is presented, where the transfer of the design to the surface is carried out by means of a principle analogous to that used in a plotter or printer. The device is so conceived that at least one guiding element with at least one treatment actuator for applying a design to a surface is guided in a circular motion around a reference point by means of a drive unit. A circular treatment area results from this rotational movement. Within this treatment area, each point can be reached by the treatment actuator (realized e.g. as a spraying device having at least one nozzle) for the application of the design. The control mechanism of the device ensures that the treatment actuator undertakes the application of the design to the surface either while passing over the point to be treated or after positioning is complete. A template in digitalized form may serve as a basis for the treatment of the surface to which decoration is to be applied.
