- "In the Shadow Lands beyond Asshai, they say there are fields of Ghost Grass, with stalks as pale as milk that glow in the night, murders all other grass. The Dothraki believe that one day, it'll cover everything, and that's the way the world will end."
- ―Ser Jorah Mormont
Ghost grass is a type of vegetation that exists on the continent of Essos. It is found in the Shadow Lands beyond Asshai. Ghost grass is pale in color and glows in the moonlight. It kills other types of grass.
Ser Jorah Mormont tells Daenerys Targaryen that ghost grass is native to the Shadow Lands. The Dothraki believe that one day ghost grass will fill the entire world, killing all other types of vegetation, and that is how the world will end.
In the books
In the A Song of Ice and Fire novels, ghost grass is described similarly as in the TV series. The map collection Lands of Ice and Fire shows ghost grass growing in vast quantities all around the mountains of the Shadow Lands, extending down to Asshai and east along the shores of the Saffron Strait, as well as northwest towards the borders of Yi Ti. The sourcebook World of Ice and Fire establishes that ghost grass is inedible, although that's all it has to say on the subject.
The books thus far have not elaborated on the nature of ghost grass, although it is suggested that it grows taller than a man on horseback. Xaro Xhoan Daxos tells Daenerys ghost grass has apparently started growing at a location in or near Qarth, but this is apparently used to illustrate the Warlocks' rising power rather than the culmination of Dothraki prophecy.
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