Smithsonian Photo Contest Galleries Photographs selected by Jeff Campagna Text by Tracy Scott Forson Seemingly still waters wind through colorful canopies displaying warm autumn hues on a hazy ...

The physical signs of fall begin when the leaves change color and start to fall from the trees. This transformation is triggered by shorter daylight hours and cooler temperatures. The process of ...

Every autumn, we revel in the beauty of fall leaf colors, but have you stopped to think about what causes leaves to change color in fall? The mixtures of red, purple, yellow and orange is the ...

they mask the color of any other pigments that may be present in the leaf. Chlorophyll in the leaves is the tree's main means of producing nutrients during the summer. But with autumn comes the ...

Chlorophyll gives leaves a green color, so when these pigments are not ... A warm period during fall will also lower the intensity of autumn colors, the U.S. Forest Service says.

Have you ever wondered why deciduous tree leaves transition through a rainbow of colours, instead of simply turning from ...

As you begin to plan your shade gardens, give some consideration to Caladiums, grown for their large, showy leaves in assorted colors and patterns. They provide dramatic long-lasting foliage that ...