Traditional floral symbol of China, they are flowers to be given on a couple?s 12th anniversary. They are one of the most popular wedding flowers because of their beautiful lush petals representing perfect greeting for a happy marriage and wish for prosperity of the recipient. They have been linked with weddings for hundreds of years now. Peonies have also been used in art by celebrated artist, Vincent van Gogh. The peony flower when fully bloomed, can get as big as ten inches wide and can become bigger than a sunflower.