The Monster Plant is an enemy that looks like a bush at first, but as you get closer, unfurls and tries to bite. It is only found in the Brain Tumbler Experiment.
When defeating this enemy, there is really nothing to it. When it is in its bush form, it is invincible, but once it has opened up, punching or PSI Blasting this enemy will defeat it easily. The player can also set fire to this enemy by using Pyrokinesis.