Magical Mediterranean Water-Plants and Their Properties is a useful Herbology book.

From the Story

Harry Potter and the Goblet of Fire

Discovered in chapter 14, The Unforgivable Curses

Professor Moody lends Neville Longbottom a copy of this book after the Defence Against the Dark Arts lesson.

Discovered in chapter 35, Veritaserum

Barty Crouch Junior reveals that he deliberately gave Neville Longbottom the copy of Magical Mediterranean Water-Plants and Their Properties whilst disguised as Alastor Moody, expecting Harry to ask all of his friends for help with the second task. The book would have told Harry all he needed to know about Gillyweed.

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