Plants / Potion ingredients
Herbology Potions

Knotgrass

Knotgrass

Knotgrass is a mundane plant used in potions.

  • Knotgrass is an ingredient in Polyjuice Potion (CS10). It grows in the Forest and can be difficult to walk through (OP30).

The reference in OP -- "Harry and Hermione were struggling through a patch of thick knotgrass" -- suggests that their may be a magical version of knotgrass which actually binds or entangles a person who walks through it. If so, Rowling is playing on the word "knot" in the name of this common plant. And indeed, the author wrote she chose knotgrass for Polyjuice potion because both people are "tied" together (Pm).

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Plants
Abyssinian shrivelfig Acacia Aconite Agapanthus Alder Alihotsy Artichoke Asphodel Belladonna Bouncing bulb Bubotuber Cabbage Chinese Chomping Cabbage Christmas Roses Daisy Devil’s Snare Dirigible Plum Dittany Fanged Geranium Flitterbloom Flutterby Bush Fluxweed Gillyflower Gillyweed
Ginger Gurdyroot Hellebore Henbane Hogwort Honking Daffodil Ivy Knotgrass Lady’s Mantle Lavender Lovage Mahogany Mallowsweet Mandrake Mimbulus mimbletonia Mistletoe Moly Monkshood Moondew Niffler’s Fancy Peppermint Poison Ivy Pritcher’s Porritch Privet
Puffapod Pumpkins Pungous Onion Rosewood Runner Beans Sage Scurvy-Grass Snakewood Tree Snargaluff Pods Snargaluff tree Sneezewort Sopophorous plant Squill Stinksap Thaumatagoria Umbrella-Sized Flowers Venomous Tentacula Whomping Willow Wiggentree Witch’s Ganglion Wolfsbane Wormwood
Potion ingredients
Abyssinian shrivelfig Aconite Acromantula venom Armadillo Bile Bat Parts Belladonna Bezoar Bicorn Parts Billywig parts Bird Entrails Black Beetle Parts boomslang parts Bubotuber Pus Bundimun parts and secretion Caterpillars Chinese Chomping Cabbage Chizpurfle parts Cockroaches Cowbane Essence Crocodile Parts Daisy Dittany Doxy Eggs Dragon Eggs Dragon Parts Dragon’s Blood Eels’ Eyes Erumpent parts Essence of Insanity Fairy Wings Flobberworm Parts Fluxweed Frog Parts Frozen Ashwinder Eggs Ginger Glumbumble parts
Graphorn Parts Hellebore Hemlock Essence Honeywater Horklump Juice Horned Slugs Horned Toad Parts Horseradish Powder Human Parts Infusion of Wormwood Ingredients jobberknoll parts Knotgrass Lacewing Flies Lady’s Mantle Lavender Leaping Toadstools Leeches Lethe River Water Lionfish Parts Lovage Mandrake Mistletoe Monkshood Moondew Moonstone Morning Dew Nettles Newt Niffler’s Fancy Occamy eggs Pearl Dust Peppermint Pomegranate Porcupine Parts Potion ingredients
Powdered Dragon Claw Pritcher’s Porritch Puffer-Fish Parts Pungous Onion Rat Parts Rats’ Brains Re’em Blood Root of Aconite Runespoor Eggs Salamander Parts Scarab Beetles Scurvy-Grass Shrake Spines Snake Parts Sneezewort Sopophorous plant Spider Legs Squill standard ingredient Thaumatagoria Tincture of Demiguise Tormentil Tincture Tubeworms Twelve Uses of Dragon’s Blood Unicorn Blood Unicorn Hair Unicorn Horn Unicorn Parts Valerian Roots/Sprigs Venomous Tentacula seeds Wiggentree Witch’s Ganglion Wolfsbane Wormwood
Timeline
Sources
Chamber of Secrets Chapter 10
Order of the Phoenix Chapter 30
Pottermore