Why Do Leaves Change Color in the Fall Plants make their own food. They take a gas called carbon dioxide from the air They turn water and carbon dioxide into food useing sunlight and something called chlorophyll. Chlorophyll is green. It gaves leaves their green color. Winter days are short and dri.
Many plants stop making food in the fall.
The chlorophyll goes away. Those colors was in the leaves all summer, but the green covered them up. Some leaves turn read. This color is made in the fall from food trapped in the leaves. Brown colors are also made in the fall.