"This is the most complicated potion I've ever seen. Lacewing flies, leeches, fluxweed, and knotgrass. Well, they're easy enough."
Hermione Granger on the Polyjuice Potion ingredients[src]

A plant pot containing Knotgrass

Knotgrass is a plant with magical properties. It is used in Potion-making, and is an essential ingredient in the making of the Polyjuice Potion,[3] as well as in the brewing of the alcoholic beverage Knotgrass Mead.[4]

History

The Daily Prophet reported in its 29 November 1926 issue that an unusually dry season had lead to a shortage of knotgrass.[5]

During the 1989–1990 school year at Hogwarts School of Witchcraft and Wizardry, sixth year Herbology students were given lessons educating them about Knotgrass by Professor Pomona Sprout.[2]

Knotgrass can be found growing in the Forbidden Forest. Harry Potter and Hermione Granger struggled through a patch of it on their way back from their first meeting with Grawp, just before they and Hagrid were approached by the centaurs.[1]

Behind the scenes

  • Knotgrass may refer to several species of the Polygonum genus found in England and Europe. It is most likely Polygonum aviculare, which was believed to halt the growth of animals, and was mentioned as such in the works of William Shakespeare.[6]
  • The use of knotgrass in the Polyjuice Potion was chosen by J. K. Rowling to represent "being tied to another person".[7]
  • In the GBA version of Chamber of Secrets, this is instead received from a Venomous Tentacula.

Appearances

Notes and references

  1. 1.0 1.1 Harry Potter and the Order of the Phoenix, Chapter 30 (Grawp)
  2. 2.0 2.1 Harry Potter: Hogwarts Mystery, Year 6, Chapter 7 (Niffler Hunting) - Herbology Lesson "Knotgrass"
  3. 3.0 3.1 Harry Potter and the Chamber of Secrets, Chapter 10 (The Rogue Bludger)
  4. 4.0 4.1 Label Collection book included with the Harry Potter Wizard's Collection (see this image)
  5. Fantastic Beasts and Where to Find Them (film) (see this image)
  6. Maud Grieve, A Modern Herbal, Dover Publications (1976)
  7. Pottermore - The Polyjuice Potion - J.K. Rowling's Thoughts


Herbology
Pottedmandrake.PNG
Herbologists
Blossom Degrasse · Miranda Goshawk · Quiac Marinus · Beaumont Marjoribanks · Nepali wizard · Gethsemane Prickle · Selina Sapworthy · Phyllida Spore · Tilden Toots · Hadrian Whittle · Sir Winogrand
Herbology at Hogwarts
Herbology Award · Herbology Lesson Cup · Herbology Race Cup · Herbology Store
Greenhouses One · Two · Three · Four · Five · Six · Seven · Professor's Office
Professors Herbert Beery · Pomona Sprout · Neville Longbottom · Unnamed Professor (19th century)
Textbooks Encyclopedia of Toadstools · Flesh-Eating Trees of the World · Goshawk's Guide to Herbology · Magical Water Plants of the Mediterranean · One Thousand Magical Herbs and Fungi · Winogrand's Wondrous Water Plants
Plants studied at Hogwarts
Aconite · Asphodel · Belladonna · Bouncing Bulb · Bubotuber · Bubotuber pus · Chinese Chomping Cabbage · Devil's Snare · Dittany · Fanged Geranium · Fire Seed Bush · Flitterbloom · Flutterby bush · Fluxweed · Gillyweed · Ginger · Knotgrass · Leaping Toadstool · Mandrake · Mimbulus mimbletonia · Mistletoe · Moly · Nettle · Puffapod · Raspberry · Screechsnap · Self-fertilising shrub · Shrivelfig · Snargaluff · Sneezewort · Spiky Bush · Spiky Prickly Plant · Stinksap · Toad-eating plant · Umbrella Flower · Valerian · Vampiric vegetation · Venomous Tentacula · Walking plant · Wax vegetables · Whomping Willow · Wiggentree · Wild rice · Wormwood
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