The forest is filled with large trees made of a silvery quartz substance. These trees extend to the surface and dot the landscape of the desert in Hueco Mundo. Aizen and the Arrancar have a considerable amount of influence here, judging by a large group of Hollow bowing down upon seeing an Arrancar. Countless Gillian class Hollow live here and follow the commands of the Guardian of the Forest of Menos and his followers. The Adjuchas in charge of the Forest of Menos are under the command of Sōsuke Aizen.
Ashido Kanō, a Shinigami, also resides in this area after being stranded during an assault on some Hollows which had invaded the Soul Society. His current status after helping Ichigo and his friends escape is unknown. There is a long, narrow opening in a cliff side that Ichigo and his friends used to escape which was sealed off right afterwards.
During the Zanpakutō Rebellion, Muramasa appears limping through what appears to be the Forest of Menos.