Beloved by artists as well as gardeners, flowers are everywhere in art. But are they just flowers or do they carry hidden meanings? Is there a deeper significance - spiritual, cultural or aesthetic - than we realise? Put on your deerstalker and prepare to exercise your little grey cells as we tour a virtual art gallery looking for the clues that artists have left for us between the petals of the rose and the sunflower, two of summer's most beautiful flowers.