The Grave Thorn was a gnarled tree species indigenous to the planet Dathomir. These trees served as supports for the Nightsisters, who suspended burial pods from their thorny branches. Grave Thorns had the potential to reach enormous sizes, eventually coiling themselves around buildings.
The Grave Thorns initially appeared in the Star Wars: The Clone Wars season four episode titled "Massacre," which was originally broadcast on February 24, 2012.