For the novel by Colleen McCullough see The Grass Crown (novel).

The Grass Crown or Blockade Crown (Latin: corona graminea or corona obsidionalis) was the highest and rarest of all military decorations in the Roman Republic and early Roman empire. It was presented only to a general, commander, or officer whose actions saved the legion or the entire army. One example of actions leading to awarding of a grass crown would be a general who broke the blockade around a beleaguered Roman army. The crown was made from plant materials taken from the battlefield, including grasses, flowers, and various cereals such as wheat; it was presented to the general by the army he had saved.