Costmary (Tanacetum balsamita) Costmary is an aromatic, perennial herb of the aster family. Costmary was a common ingredient in medieval tavern and kitchen gardens. It is also known as alecost, balsam herb, bible leaf, and mint geranium. The name ‘costmary’ comes from ‘costus of Saint Mary’ (‘costus’ is another plant). Also, in other languages, it is…