Abstract: A method of growing plants comprising determining preferential light wavelengths for promoting growth of a plant. The method further comprises constructing one or more light filtering panels arranged to filter natural sunlight or artificial light to produce filtered light comprising the preferential wavelengths. In addition, the method comprises locating one or more plants in a structure constructed at least in part from one or more of the panels. The method also comprises illuminating the structure from outside with natural sunlight or artificial light to pass through the one or more panels and produce the filtered light wherein the filtered light is directed to radiate the plants.