Herbifors is the incantation of a transforming spell that can be used to force yellow flowers out of the victim's head. It can be bought at Wiseacre's Wizarding Equipment in Diagon Alley.
The incantation is a combination of the prefix "herb-" from the English, referring to a type of plant, and the -fors suffix.
Behind the scenes
- It is possible, given the use of the -fors suffix in the incantation, that this can be used to transform things into flowers.