There's trees bigger than 6ft diameter. Banyan trees in south Florida, as well as oaks in north Florida. I've got a picture of one somewhere, I'll see if I can find it.
Here's one https://pic8.co/sh/ZagxhP.jpg
See, that's the problem with trees like that. They could grow forever but they get too heavy and one day a limb breaks. Then rot starts setting in and more break. Or wind or lightning.
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