Lorien

[Gorthaur the Cruel]

Originally Posted by Michael Wilhelmson

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.

I don't think the Lady Galadriel brought Mallorn to middle-earth for it was said that Gil-Galad had gave these to her (mallorn nuts), & it was actually derived from the Numenorians where only one Mallorn grew in all the lands. It was said that they were the fairest & mightiest of all trees but I've never heard them growing somewhere in Tol Eressea, or Valinor, or even the gardens of Irmo Lorien, no Mallorns have been mentioned... so Galadriel's version of Lorien might've been the fairest.