Knotgrass is an ingredient used in potion-making.
Knotgrass is used in the following potions :
- Polyjuice Potion (Part 1)
- Apothecary : 5 for 5 Galleons
- It can be found on the grass near Ron in Book 2, Chapter 7 , Moment 1 .
- It's an award for keeping spiders away from Harry and Ron in Book 2, Chapter 15, Moment 2.
- Near Ron's feet in Book 3, Chapter 6, Moment 3.
- Near the tub in Book 3, Chapter 16, Moment 1