Leaves of trees are seasonal organs. The period of their life is limited to several months. That is why in autumn, when days become shorter and there is less sun light, the chlorophyll production which is responsible for a green color of leaves diminishes. However, other pigments appear, such as carotenes or xanthophylls, which make leaves so colorful. All these combined make an autumn walk amongst colorful leaves very pleasant. Bouquets made of colorful leaves are often a beautiful decoration of a house.