The Plant Man is a plant monster, who's body is surrounded by thick, green leaves. He has beady black eyes, sharp teeth, and branches for arms and legs, with leaves for his hands and feet and carries an arrow.
He only appears in the episode, "Plant Man." The creature generally eats any fruit that K'nuckles and Flapjack try to get ahold of, and when they yell at him he roars like a lion. He is characterized as looking like a small walking bush with sharp teeth and carrying an arrow.
Flapjack lures him into biting a rock, where he then breaks his teeth. He responds by saying "Is that a rock? Did I just bite a rock? Oh that's terrible." He then asks where he can get a soft meal, and K'nuckles and Flapjack lead him to the Candy Barrel for some fish mush. At the end of the episode, when K'nuckles and Flapjack are talking about what would've happened if K'nuckles had been cut open, he says "Hey! I'm trying to eat fish mush here."