Jeroen,
The vast, vast majority of cottonwoods in the Champlain Valley are natural regeneration. However, the species was also planted as an ornamental. I presume because it grows fast and creates a lot of shade. The trees on Plattsburgh AFB were planted I believe. I think Tom said they were in his post. I don't know about the huge cottonwood on the estate. I'd say it is a 50-50 proposition for that tree.
Those black cottonwoods are really something. Thanks for sharing. I just love cottonwoods. They are one cool species, east, west, north, or south. America or Europe.
Bob
