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Question:
In Eastern North America leaves turn a wide variety of colors in the fall. However, in the west they only turn yellow/brown. Why do we get reds and ranges of Orange in southern Ontario and only brown in Alberta?


Replies:
Leaf color is often characteristic of the tree species (kind of tree) as well as environmental variables.

http://en.wikipedia.org/wiki/Autumn_leaf_color

http://nationalarboretum.usda.gov/PhotoGallery/FallFoliage/FallFoliage01.html

Anthony R. Brach, PhD
Missouri Botanical Garden
Harvard University Herbaria



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