Peony is a shrub of Ranunculaceae. Known as the "flower king" and "rich flower". It is a famous flower in China. There are many kinds of peony, which can be divided into six categories: divine products, famous products, spiritual products, yi pin, functional products and tools. "Compendium of Materia Medica" said: "Peony is the first flower group, followed by peony. So peony is called the king of flowers. " In the Song Dynasty, Luoyang Peony had been promoted to the top of the world, so it was called "Luoyang Flower". Peony is rich and beautiful, known as the "rich flower" and is the wealth of the country. Peony has a beautiful color and reputation, which means good luck. Therefore, in gardening, it is often combined with Shoushi as "long life and wealth" and Catharanthus roseus as "rich Changchun" landscape.