We buy about 10 million flowers a day around the world. They narrate the stories of our lives: we give them to show love, sorrow, to mark a special occasion, or just because they smell nice.
And of course we eat them and the fruits and vegetables they produce.
Stephen Buchmann loves flowers, he's a bee keeper and an Ecology and Entomology professor at the University of Arizona. His new book is 'The Reason for Flowers - Their history, culture, biology and how they change our lives' .