The present invention discloses a non-GM method for producing a crop exhibiting improved traits compared to a control population of plants of the same crop species comprising the steps of providing a population of plants, exposing said population of plants to a predetermined light treatment regime by irradiating with artificial light in a specific wavelength range, monitoring at least one trait of said plants of step (b), comparing to said control population and selecting at least the top about 0.5%, preferably 1-2% plants having the best improved trait of said plants of previous step, propagating at least one subsequent generation of said at least 0.5%, preferably 1-2%, best improved trait plants, optionally repeating previous steps for least one subsequent generation, thereby obtaining a crop exhibiting an improved trait, wherein the improved trait is inheritable for at least one more generation, preferably for two or more generations, more preferably for 3 to 5 generations, and even more preferably for 6 to 8 generations.
