Southernmost North American location with dormant vegetation (look, Alaska, Florida)
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What is the southernmost location in the United States where there is a distinct period of dormant vegetation. I know that trees lose their leaves on the gulf coast and Florida peninsula, but there isn't a full period of dormancy, as different trees might be growing and losing leaves at the same time.
I think that northernmost Alaska is the only possible answer, there is no southernmost location in the USA. But what length of time do you consider to be a full period of dormancy, and for what plants?
Dormancy for the trees and a period that is long enough to be noticeable
It sounds like you mean a noticeable period of dormancy for all trees all at once in the same location? If that's what you mean then there is no such place unless you exclude evergreens from the equation. Are you excluding evergreens?
The OP is confusing leaf-fall with dormancy. Many plants including trees exhibit summer dormancy as well as winter dormancy. Dormancy just means growth stops. Some species don't ever lose their leaves even though they go dormant.
So ask the question you really want. Are you asking if the landscape looks barren? If the leaves turn color in the fall? It's difficult to tell what concerns you.
The landscape in areas with deciduous forests can look bare for several months. An example is Michigan or Ohio. But mixed forests might have deciduous trees lose leaves but the landscape is still green due to all the evergreens. An example is the Carolinas. Some areas never change such as Florida.
You only see lack of dormancy in the tropics. Northern Florida is subtropical, southern Florida is tropical with a transition zone in between. You do get what you'd call full dormancy in north FL in the winter.
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