Comments by "Me Here" (@mehere8038) on "How Mexico Grows Limes On Orange Trees To Supply The US | Big Business | Business Insider" video.
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@TamagoHead I'm guessing it would have been observed prior to written history, probably even more than post written history, as people were beginning to detach from nature as writing was starting. Yew trees are a bit different, but have a look into them, they're often found in church yards in Europe & considered sacred, but they weren't planted there because of that, the church was built there because of them! They naturally hollow out over time & get hollowed out by humans to live in & all sorts of stuff. I'm not sure if their branches "graft" onto themselves or not, but they're probably doing similar stuff, close enough to give an idea of what people were seeing & understanding of trees before a time when most people were literate.
I doubt people would have been intentionally grafting plant types that we graft today before written history, back then, they were more interested in increasing seed sizes & getting them all to mature at the one time & other stuff that today we refer to as "domestication". Domestication of plants occurred on every continent (except Antarctica & Zealandia, due to no humans there)
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