Heights of four focal species in all treatments throughout growing season.

<p>Heights of five individuals in each plot were measured every third day between June 3^rd and July 24^th 2012. Solid symbols show the average height of plants grown in fertilized treatments, open symbols are unfertilized plants. Triangles show fenced treatments, circles are unfenced. Arrows indicate, for each species, the date at which plants in fertilized treatments were significantly (p<0.05) taller than plants in unfertilized treatments.