Princess Plant

The Princess Plant is a type of plant seen in "Death in Bloom." It resembles a white lily, except it has a swirly petal. When Princess Bubblegum assigned Finn and Jake to take care of it, they accidentally killed it and had to go to the Land of the Dead to reclaim its soul from Death. When Princess Bubblegum ate the flower bulb, it changed her hairstyle from being straight and knee-length to being a short, wavy bob.

Trivia

 * When Princess Bubblegum eats a bulb from the plant it changes the style of her hair. When Finn realizes that's the reason why he saved the plant, he appears confused.