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ArboristSite Guru
I've lived in an area where the only wood you could find was Cottonwood or a species of Pine. You could always tell where the old homesteads were by where the huge Cottonwood were. Some of those trees looked like they were 150+ years old by New England tree standards but they were only a bit more than half that age. With nothing else around, I'd certainly burn that wood. But I'd have to have 2X to 3X the wood supply that I'm used to if I wanted to rely on Cottonwood as primary heat.