Essence Of dittany

Essence of Dittany is used by Hermione Granger in Harry Potter and the Deathly Hallows. It was used on Ron when he was Splinched when dissaperating away from the Ministry. Hermione Only cured him halfway "a new layer of skin suddenly formed over the gash," but Hermione said that it could cure all the way.

Dittany is a Magical plant with strong healing powers. This was first mentioned in Harry Potter and the Philosiphers Stone when Harry was studing over his Easter Holiday. It was in the book One Thousand Magical Herbs and Fungi.