Board Thread:Suggestions forum/@comment-86.121.41.196-20160425132227/@comment-26298013-20160427193616

Mallorn Trees can grow in the Shire, they can probably also grow in Lindon. The same magic is at work in Lorien and Lindon (The Ring of Adamant in Lorien, the Ring of Fire [Except for the time in which Gandalf bears the Elf Ring around Middle-earth] in Lindon), and so logically they can (And probably would) grow somewhat in Lindon.

Though given our limited information about Lindon, anything's possible. Except for Orcs.