Silverweed (Potentilla spp.) is a species of plant in the rose family. It is used in potion-making; there was some in the potions stores at Hogwarts School.  It is yellow in colour, and some substances are able to conserve it.
- Harry Potter and the Philosopher's Stone (film) (First appearance)
Behind the scenes
- Silverweed, or goosewort, was a highly respected medicinal plant in medieval Europe, used to treat abdominal cramping and open sores.