Lastly, as the temperatures continue to decrease, the leaves eventually turn brown and fall from trees. During winter, the days get shorted affecting the amount of sun the leaves are exposed to. Some trees like oaks, turn brown and red, while aspens turn yellow. When the seasons change in places where deciduous trees grow, the days get shorter (there is less sunshine) and the weather gets colder. Ever wonder why leaves change color? Also, the main reason for color change is not weather, but light, or actually the lack of it. The air is crisp, the animals are stockpiling food for winter, and the leaves…oh the leaves…are positively brilliant. The brown color of trees like oaks is made from wastes left in the leaves. So, sit back and count down the days until you can enjoy the fall foliage with a … Inside a leaf there are millions of little packages of color in green, yellow and orange. Due to this lack of sunlight, plants go into a resting state and live off of the glucose that they stored over the summer. Repetition is good. The leaf color change is initiated by the decrease in the amount of daylight hours. The best colors are produced when the weather is dry, sunny, and cool. 3 Why do leaves change color? Due to this lack of sunlight, plants go into a resting state and live off of the glucose that they stored over the summer. (Xanthopylls are also found in egg yolk and human blood plasma .) Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. Why do leaves change color? Ever wonder why leaves change color? To figure out what color a leaf would be without the dominant chlorophyll color, we can separate the colors by doing this simple chromatography activity. Where do leaf colors come from? Oaks are also knowns for holding onto their summer colors until after other trees have already lost their leaves, while more southern sourwoods might … To shed its leaves, a tree will form barriers of cells between its branches and the stems of the leaves. Leaves change color in the fall because of the decrease in sunlight and temperature which slows down the production of food. Lastly, as the temperatures continue to decrease, …