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Herbology Nineteen years later

Gillyweed

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The Harry Potter Canon
Nineteen years later SPOILER WARNING! This page contains information from Harry Potter and the Cursed Child and may contain spoilers. Read at your own risk!

"You has to eat this, sir! ... Right before you go into the lake, sir - gillyweed! ... It will make Harry Potter breathe underwater, sir!"
-- Dobby the Hogwarts House Elf (GF26)

Gillyweed

Native to the Mediterranean, this water plant looks like a bundle of slimy, greyish-green rat tails.

  • When eaten, gives a person gills to breathe underwater and gives them webbed hands and feet for swimming. The duration of the gillyweed effect is approximately one hour.
  • Snape keeps gillyweed in his private stores; it is not available to the students. Snape believed Harry had stolen the gillyweed, but actually it was Dobby (GF26, GF27)
  • Barty Crouch Jr. as Fake Moody tried to give Harry a hint about gillyweed by giving Neville Longbottom the book Magical Water Plants of the Mediterranean. When that didn't work, he let Dobby overhear a "loud conversation" about it with McGonagall in the Staff Room (GF35).
  • The effects of gillyweed were first dicovered by Elladora Ketteridge (FW). About a century later, gillyweed was apparently re-discovered by Beaumont Marjoribanks (FW).
  • In one of the possible timelines following the use of the Experimental Time Turner, Albus Potter and Scorpius Malfoy take gillyweed when they re-visit the second task of the Triwizard Tournament (CC2.19).

Commentary

Etymology

"gill" = a breathing organ found in many aquatic organisms

Pensieve (Comments)

Tags: breathing discoveries green help plants underwater water