"Today we will be mixing a potion that often comes up at Ordinary Wizarding Level: the Draught of Peace, a potion to calm anxiety and soothe agitation ... The ingredients and method are on the blackboard, you will find everything you need in the store cupboard, you have an hour and a half… start."
-- Severus Snape, at the start of the first fifth year potions class (OP12)
A wide variety of plants and animal parts are used in making potions. These ingredients can be magical or mundane. Some of the plants are grown in the greenhouses and some of the animal parts come from magical creatures living in the Forbidden Forest, such as unicorn hair. Potion ingredients are kept in a store cupboard in the Potions Classroom. The Potions Master has a separate private store cupboard as well.