Who gave Harry the gillyweed in Harry Potter and the Goblet of Fire?

Answer 1

In the book, Dobby gives Harry the gillyweed after overhearing Moody discussing it with Professor Snape in the staff room.

In the movie, Harry mentions his problem to Neville who tells him about gillyweed.

Answer 2

In the book, Dobby the House Elf gave Harry the gillyweed. In the film, Neville gives him the gillyweed, with the help of Moody (A.K.A. Barty Crouch Jr.). Moody tricks Dobby into stealing gillyweed to give to Harry Potter. Harry learned about gillyweed from Neville Longbottom, and Neville learned it from a book Moody gave to him.

Answer 3

Answer: Neville

Answer: In the book, Dobby the house elf. In the movie, it was Neville.

Answer 4

Dobby who overheard Alastor Moody discussing it in the staff room and stole some from Severus Snape's stores.