Well, it’s not the cold weather per se, but you can say that it comes WITH the cold. The real reason leaves change color is because of the chlorophyll in the leaves. The chlorophyll is what gives leaves their green color. It is also one of the main components in photosynthesis, which is a process that helps the plant make its food. However, as winter approaches, plants go into winter dormancy caused by a chemical called phytochrome. This chemical causes the chlorophyll to “build up in the leaf sap which causes the leaves to turn shades of red and purple depending on the acidity of the soil.”
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