|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Dragon dung is 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 at his job at the Ministry of Magic, under the pretence of it being a fertiliser sample from Norway.