Knotgrass can be found growing in the Forbidden Forest. Harry
Potter and Hermione Granger struggled through a patch of it on
their way back from their first meeting with Grawp, just before
they and Hagrid were approached by the centaurs. Behind the
scenesEdit - Knotgrass may refer to several species of the
Polygonum genus found in England and Europe. It is most likely
Polygonum aviculare, which was believed to halt the growth of
animals and was mentioned as such in the works of Shakespeare. -
The use of knotgrass in the Polyjuice Potion was chosen by J. K.
Rowling to represent "being tied to another person". - Harry
Potter and the Chamber of Secrets - Harry Potter and the Chamber
of Secrets (film) (Mentioned only) - Harry Potter and the
Chamber of Secrets (video game) - Harry Potter and the Goblet of
Fire (Mentioned only) - Harry Potter and the Order of the
Phoenix - The Wizarding World of Harry Potter (Mentioned on a
bottle) - The Road to Hogwarts Sweepstakes Notes and
referencesEdit - ↑ Grieve, Margaret, an