Crabby Grass is a type of grass held by a "monster" in Guffawha Ruins. It cures Bean Fever and grows only in Guffawha Ruins. The so-called monster is actually a nice guy who is tired of rumors of him being a monster. To find the courage to go to Guffawha Ruins, Luigi visits Psycho Kamek, and Psycho Kamek hypnotizes Luigi to make him think he is Mario. In the end, Luigi loses his memory of this whole incident, but remembers to give the Crabby Grass to Mario.