Arkasú was a mildly enchanted milkweed originally native to mild, temperate tallgrass prairies, later widely cultivated. When applied to a wound, its milky yellow sap healed concussion hits and doubled the wound's healing rate. Also, all parts of the plant were edible.

Boromir: "Is it not a strange fate that we should suffer so much fear and doubt for so small a thing? So small a thing!"
- J. R. R. Tolkien, The Fellowship of the Ring II:10
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