This year’s fall foliage gets very high marks for intensity, variety and duration of color.
No late tropical storms have blown away the leaves just at their prime. No persistent droughts or drowning floods have afflictedÂ the southern mountains to disappoint piedmont leaf-peepers with a view of bare branches or bland vistas for their efforts to reach the Blue Ridge Parkway.
But the prize, to my mind, goes to the oaks this year. They have delayed the rich browns to dwell in the reds for far longer than is usual.Â [My personal every-year favorite in our woods is the beech, pictured here, click to enlarge.]
But why? What factors influence the timing and the colors that autumn offers?
Some of that is know, some is not.
Some of that can be answered for today, but not for the autumns to come in our children’s lifetimes as the planet seems sure to warm by more than five degrees as we debate need to act.
Understanding the reds I speak of is a matter of knowing about anthocyanins, since that pigment is present in those red-change deciduousÂ plants likeÂ like smooth sumac, maples, and this year, oaks.
But why do plants that go red bother, when shortly thereafter they will just jettison those lovely scarlet leaves to decay below?
There are theories. We don’t really know fully why we’re seeing what we’re seeing out our Floyd County windows this morning. And we don’t know that the view will always be the same in autumns to come.
If you’re interested in reading more, here are some pointers.
â–º Why Leaves Turn Red in Autumn. The Role of Anthocyanins in Senescing Leaves of Red-Osier DogwoodÂ [scholarly-geeky]
â–ºÂ Saupe: Why turn them red when leaves will be leaving?Â
â–ºÂ Is this the end of autumn as we know it?Â | Visit Colorado
If yellow is your favorite fall color, like your beech, you must travel west to see the aspens and cottonwoods. Red is very rare in the Southwest, but yellow is everywhere, and very intense.