No, this isn’t a deep-cut Game of Thrones character. Yarrow is used topically for wounds, cuts and abrasions. It relaxes peripheral blood vessels, cleans wounds, encourages clotting and reduces swelling. (Its Latin name, Achillea millefolium, actually comes from its association with the Greek warrior, Achilles, who used the herb to heal his soldier’s battle wounds). Beyond just healing your wound, Yarrow can be planted in the garden to combat soil erosion. Field-tested against White Walkers and Lannisters.