Within season and carry-over effects following exposure of grassland species mixtures to increasing background ozone

► Increased background ozone concentrations increased the grass:forb cover ratio. ► Competing grass species influenced ozone enhanced senescence of Leontodon hispidus. ► Ozone delayed winter die-back of leaves of L. hispidus. ► Flowering was accelerated for L. hispidus in the year following ozone exposure.