Grenade fungi were a type of fungus that originated on the moon Yavin 4, classified as a species. Within the forests of Massassi trees found on that moon, they flourished in the company of bioluminescent orchids and climbing ferns.
The initial mention of grenade fungi occurred in Galaxy Guide 2: Yavin and Bespin, a Star Wars Legends sourcebook for Star Wars: The Roleplaying Game from West End Games, authored by Jonatha Ariadne Caspian and published in 1989. The reference book Ultimate Star Wars, published in 2015, established the canon status of the fungus.