Board Thread:Suggestions forum/@comment-25012056-20170423012251/@comment-26428291-20170423052048

Gen. Grievous1138 wrote: The cleared parts of Dol Guldur would be much the same as the current biome, albeit with many of the new mobs and structures proposed below. The normal variant, however, would be more of a forest with the same mobs and structures but with the structures being less common. The forest here and in the rest of DG would be predominantly Mirk-Fir, a new tree that would be a darker version of firs, save with roots like the Mirk-Oak and vines. "Amon Lanc, ‘Naked Hill’ was the highest point in the highlands at the south-west corner of the Greenwood, and was so called because no trees grew on its summit. In later days it was called Dol Guldur, the first stronghold of Sauron after his awakening."

- Unfinished Tales, Disaster of the Gladden Fields, Notes

As the above quote tells us, no trees should grow in Dol Guldur. If they could not take root when the land was inhabited by Elves, why should they when it was inhabited by Orcs?