Viticulturist/Winemaker at Opus One Creator of the Orbital Org Chart – There is a best fit leader for any given situation. Napa Valley Grapegrowers, President Napa County Housing Commissioner Grapevines use light to grow vegetation and sweeten grape berries. The wavelengths of light the plant uses are red and blue. Red is the color of passion, blue is the color of reason, and you need both to do great things in life.