Celery

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Celery

The Fifth Doctor has a habit of wearing a stalk of celery pinned to the lapel of his frock coat, beginning shortly after his regeneration while visiting the city of Castrovalva in Andromeda (DW:[Castrovalva (TV story)|Castrovalva]]). While attending dinner as a guest (or captive) of the Eternal Captain Striker, the Doctor replaces his old stalk with a fresh one (DW:Enlightenment). He also attempted to revive a dying Peri by having her smell it. Her human olfactory sense did not suffice for the plant to help her. (DW:The Caves of Androzani")

The Fifth Doctor claimed to be allergic to certain gases in the Praxis range of the spectrum, in whose presence the herb turns purple.In that case, he would eat the celery. (DW:The Caves of Androzani

Whether this allergy may extend to all Gallifreyans, only some of them, or to all the Doctor's incarnations or only his fifth, is not known.::