Cunningham's Encyclopedia of Magical Herbs - Scott Cunningham 1985

Celery
The Herbs

(Apium graveolens) P R

Folk Names: Aipo, Karafs, Elma

Gender: Masculine

Planet: Mercury

Element: Fire

Powers: Mental Powers, Lust, Psychic Powers

Magical Uses: Chew the seeds to aid in concentration, or use in spell pillows to induce sleep. Burned with orris root, celery seeds increase psychic powers. The stalk, along with the seeds, induces lust when eaten.

Witches supposedly ate celery seeds before flying off on their brooms so that they wouldn’t become dizzy and fall!