At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
Stinksap is a magical green fluid that smells like rancid manure and is contained in some plants like Mimbulus mimbletonia, as well as certain trees. The Mimbulus mimbletonia plant uses it as a defensive mechanism when touched, while Stinksap itself can be used to nurse ill animals.
During the 1986–1987 school year, Stinksap was covered in third year Herbology class. Students were reminded by Professor Pomona Sprout about wearing nose plugs before beginning the process. During the class, Jacob's sibling wondered if anyone died from smelling Stinksap. After the class, Professor Sprout asked the student to refrain from touching anything, bathe for at least ninety minutes to remove the stench. Jacob's sibling thought that Stinksap smelled like warm cheese wrapped in a sweaty gym sock.
On 1 September, 1995, Neville Longbottom showed his recently-acquired Mimbulus mimbletonia to his classmates on the Hogwarts Express. In order to demonstrate its defensive mechanism, Neville prodded the plant, which covered the whole compartment in Stinksap. Harry Potter was covered in it (with as much as a mouthful), Ginevra Weasley blocked herself in time, and Luna Lovegood's issue of The Quibbler was dirtied. Ginny used the Scouring Charm to clean up the mess.
In 1996, Aragog, leader of the Forbidden Forest Acromantula colony, fell ill. In an attempt to nurse the Acromantula back to health, Rubeus Hagrid extracted Stinksap from a cluster of trees found en route to Hogsmeade. Hagrid later administered the Stinksap, but was ultimately unable to heal the ailing Aragog, who later died.
- Harry Potter and the Order of the Phoenix (First appearance)
- Harry Potter and the Order of the Phoenix (video game) (Mentioned only)
- Harry Potter and the Half-Blood Prince (film) (Mentioned only)
- Harry Potter: The Character Vault (Mentioned only)
- Harry Potter: Hogwarts Mystery
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