Why do some leaves turn yellow in autumn, while others turn red? • Leaves contain various coloured pigments. The pigments carotene (orange), xanthophyll (yellow) and chlorophyll (green) are found in ...

Yellow leaves can be an ambiguous symptom in plants. Like a fever in humans, yellowing leaves often indicate a health problem, but there are so many causes that the symptom doesn't indicate exactly ...

Autumn is a big time for trees. Many shed their leaves, and of course, before the leaves fall, they can turn brilliant colors. One of those colors has generated a lot of heated debate among scientists ...

Scientists know why leaves turn yellow in the fall: Chlorophyll breaks down, revealing the yellow pigment that was there all along. But red? Red... Fall foliage is still a mystery: Why do some leaves ...

As leaves die in the fall, color pigments form from sugars trapped in the leaves, producing the different red and yellows and oranges and purples. Bill Kreiger, professor of earth sciences and science ...

I recently answered a question in my advice column on some azaleas with leaves turning color. A significant percentage of the leaves had turned orange, and the gardener was concerned that something ...

Leaf watchers will still have an opportunity this weekend to see some of the bright fall colors throughout the state this weekend, although the window for viewing the changing colors is closing ...