Answer: Oranges will remain on the tree for several months but they should probably be removed by late February so the tree can concentrate on the new fruit it is producing. I harvest my mature oranges each time the tree puts out a fresh flush of flowers. Depending upon weather, that's usually in mid-January. That's also when I prune. This way I know where the new fruit will be developing and I can control the size of the tree. With your tree I would suggest you harvest all the full sized fruit that you know is mature and allow the tree to concentrate on maturing whatever else is there. Enjoy your oranges!
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