In Los Angeles’ Urban Forest, many trees are deciduous, and shed their leaves throughout fall before becoming dormant in the winter season. This process is known as abscission. During this process, the trees decrease their production of chlorophyll, which is a vital compound for photosynthesis. Chlorophyll gives the leaves the green-colored pigments. Consequently, as chlorophyll recedes from the trees’ leaves, other pigments begin to show. These pigments include red, brown, yellow, orange and purple which give Angelenos fall leaf colors in the Urban Forest.