Athelas

Athelas, also known as Kingsfoil or Asëa Aranion, was a healing herb that grew throughout Middle-earth.
== History ==
Athelas was first brought to Middle-earth by Númenóreans, but by the end of the Third Age the knowledge of its healing properties was lost among all but the Rangers of the North and the Elves, and it was commonly considered by most men and hobbits to be a useless weed. According to folklore in Gondor, it was especially powerful in the hands of the king. It was used by Aragorn when he secretly entered Minas Tirith upon his return to Gondor to heal those (such as Éowyn) who had been touched by the Black Breath, an act that enhanced his reputation and strengthened his claim to the crown. 
Aragorn also used Athelas to ease the pain of Frodo's wound when he was stabbed by a Morgul-knife at the Weathertop camp. The scent of the leaves also calmed the minds of the other Hobbits. Additionally, Athelas was used after Moria when Aragorn tended to Frodo and Sam's injuries. After the Battle of the Pelennor Fields, Aragorn used Athelas in the Houses of Healing to revive Faramir, Lady Éowyn, and the hobbit Merry, who were all under the shadow of the Black Breath.
Some Men of Gondor used an infusion of Athelas for headaches.