Soulbell (plant) is a plant located only within a dungeon in the skill Dungeoneering. The plant is found fully grown and can be picked if the player has 60 Farming or higher, giving 44 experience per piece. Picking the plant yields 1-7 pieces of Soulbell.
In Thok Your Block Off, it is called Frilly plants by Thok, and has an examine of Marm make new clothes with this. Maybe Thok make something too.