https://en.wikipedia.org/wiki/Pelargonium_graveolens

A deeply aromatic essential oils with rose and minty overtones is extracted from the leaves of this highly prized Geranium species. It is known since ancient times for its  relaxing and calming properties, as well as for menstrual pain. Due to its high geraniol content, Geranium may cause allergic dermatitis with chronic inadequate exposure.  As a fragrance, some exquisite and ultra-refined Arab pastries incorporate a few drops of the hydrosol.