At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
Dragon dung was used as a fertiliser in Herbology at Hogwarts School of Witchcraft and Wizardry. In 1994, Fred and George Weasley sent dragon dung to their brother Percy to his work office at the British Ministry of Magic, under the pretence of it being a fertiliser sample from Norway.
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