Hyssop

Hyssop is a shrubby member of the mint family, native to southern Europe, the Middle East and the Caspian region. Wikipedia traces its use to classical antiquity, and says its name adapts the Greek hyssopos and that it was used for purification in Egypt. Kynes gives the Greek meaning as holy herb, used to clean sacred places, and says medieval English people rubbed it on door frames against witches. Cunningham calls it the most widely used purification herb in magic: sachets in the bath, infusions sprinkled to cleanse, and sprigs hung in the home to purge evil and negativity. Kynes infuses sprigs in olive oil to anoint, burns a leaf to raise vibrations, and keeps a sprig under the bed for fertility. The AHPA handbook says hyssop is not for use in pregnancy except under the supervision of a qualified healthcare practitioner. Wikipedia warns that its thujone and related chemicals can provoke epileptic reactions.