Flowers can talk. Red roses say 'I love you', white lilies offer condolence and poppies invite us to remember. For thousands of years, humans have used flowers as a language, a short-hand for emotions and meanings. In her new book, Sally Coulthard, takes a fascinating look at floriography and shows how we still use this secret language across the world. She delves into the meanings of flowers and where they came from, whether it's ancient mythology...