|The following is based on Van Buren and has not been confirmed by canon sources.|
Destroy the carnivorous plants that are taking over the gardens was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is located at Nursery.
Infiltrate the gardens and then locate and destroy all inimical life forms there.
The gardens have inadvertently turned the maze into a trap for unwary animals that wander in. Infiltrate them and then locate and destroy all the carnivorous bushes, carnivorous vines, creeping vines, thorn sprayers, gas sprayers and tangle weeds.