In the Appendices, Tolkien says that two foreign trees were introduced to Middle-Earth- The White Tree of Numenor, and the Mallorn of Lorien. Both of these trees resemble the Two that existed in Valinor, and are mortal versions of the darkened trees. Lady Galariel could easily have brought the mallorn itself to Middle-Earth, just as the kings of Numenor were gifted the White tree from the valar.
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Horseman of the plains
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