Yggdrasil is a mythical tree in the Beast Wars Neo continuity.
BWN Yggdrasil

Yggdrasil is the legendary tree of the equally legendary planet Greengard. It is said to be responsible for the eternal greenness of the planet, maintaining the plant life so it never dies.


Beast Wars Neo comic

Unfortunately, when the Maximals came looking for Angolmois, Yggdrasil was nowhere to be seen, and the planet was an icy wasteland. The Angolmois was interfering with Yggdrasil's function, so once the Maximals discovered it, the planet returned to its legendary greatness, with Yggdrasil being revealed as the highest ice peak and where the Angolmois was found. Will the Second Capsule Slumber in the Garden of Paradise?!