The Growth Charm (incantation unknown) is a charm which increases the physical size of the target; it is unknown whether the spell is used to increase the size of the target's cells themselves, or if more cells are created to give an appearance of a greater size.
During his Charms O.W.L. in June of 1996, Harry Potter confused this spell's incantation for that of the Colour Change Charm. Thus, his rat swelled to the size of a badger instead of turning orange as he was supposed to have done to it.
Behind the scenes
Given that Harry confused the two spells, it is likely this and the Colour Change Charm have similar incantations.
- Harry Potter and the Order of the Phoenix (First appearance)
|Professors: Filius Flitwick|
|Textbooks: The Standard Book of Spells · Achievements in Charming · Quintessence: A Quest|
|Charmbook writers and charm developers: Miranda Goshawk · Scarpin · Felix Summerbee · Randolph Keitch · Basil Horton · Mnemone Radford · Elliot Smethwyck · Jarleth Hobart · Delfina Crimp · Orabella Nuttley · Levina Monkstanley · Fred Weasley · George Weasley|
|Charms studied at Hogwarts: Levitation Charm · Fire-Making Charm · Softening Charm · Skurge · Aresto Momentum · Cheering Charm · Freezing Spell · Seize and Pull Charm · Summoning Charm · Banishing Charm · Silencing Charm · Mending Charm · Reductor Curse · Colour Change Charm · Growth Charm · Water-Making Spell · Locomotion Charm · Vinegar into Wine · Bird-Conjuring Charm|