To start gathering Ghost Mushrooms in World of Warcraft you will need to have the herbalist skills. Your Herbalism level should be around level 245. Ghost Mushrooms are located in a little cave called Hinterlands. This guide can be used by both Alliance and Horde characters. You can easily gather about 10-25 gold per hour. Your character should be at least level 44, the higher the better however. The mobs in the cave are level 46-48.

Hunting Grounds:
Simply put, SKULL ROCK, in the Hinterlands. Consult the provided map below in order to get to Skull Rock. Note that the entrance to the cave is on the north side, and faces the river… even though the map makes it seem like the cave opens to the south.