gillyweed

Like changing Dobby to Neville giving Harry the gillyweed.

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It would have told you all you needed to know about gillyweed.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

Jumping to his feet he pulled off the Invisibility Cloak, stuffed it into his bag, grabbed the gillyweed, and put it into his pocket, then tore out of the library with Dobby at his heels.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

"Right before you go into the lake, sir - gillyweed!"

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

He was chewing the gillyweed as hard and fast as he could; it felt unpleasantly slimy and rubbery, like octopus tentacles.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

"What's it do?" said Harry, staring at the gillyweed.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

The whistle echoed shrilly in the cold, still air; the stands erupted with cheers and applause; without looking to see what the other champions were doing, Harry pulled off his shoes and socks, pulled the handful of gillyweed out of his pocket, stuffed it into his mouth, and waded out into the lake.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

"You saved my life with that gillyweed, Dobby, you really did," said Harry.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

I staged a loud conversation with Professor McGonagall about the hostages who had been taken, and whether Potter would think to use gillyweed.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

"Harry Potter used gillyweed to great effect," Bagman continued.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000