You'll probably be surprised to hear that scientists aren't positive as to why leaves change color in the autumn ...
Is it because pigments in the leaf (specifically chlorophyll) break down as the weather turns colder?
Is it part of a "bigger picture" of winter preparation for the tree or plant?
Is it a type of bug repellant from aphids that can only see in ultraviolet, blue, and green?
Whatever it is, I could look at fall-colored trees all day.
They are certainly striking this time of year ... Especially when set against a bright, blue sky.
1 year ago
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