From what I was told citrus is grafted to sour orange trunk for cold hardieness...I have eaten oranges from store bought seed but they didn't have but 8 or 10 on the tree...I do know if a tree freezes and sprouts above the graft it will be good but if it sprouts below the graft it will be sour as hell ,,, worse than lemon....Then again I did not sleep at a holiday inn last nite......
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