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Why do leaves change color? 

 

Fall Fertilization
Learn what you should be doing in the autumn to prepare your trees for the winter.

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Chlorophylls, of course, aren't the only chemicals present in the leaf. A second group of chemicals is a set of pigments called carotenoids. Carotenoids are dark orange and yellow in color and are normally masked by the green of the chlorophylls during the spring and summer. However, as the supply of chlorophylls within the leaf begins to dwindle away, the vibrant oranges and yellows of the carotenoids begin to appear.

Next: Part 4

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