Echinochloa oryzoides is a species of grass known by the common name early barnyard grass. Some of the species are known by the common names barnyard grass or cockspur grass. Examples of crop weeds include chickweed, barnyard grass, dandelion, striga and "Japanese knotweed". Barnyard grass was one of the five most cultivated crops during Joseon Dynasty in Korea. In particular, common barnyard grass ("E. crus-galli") is notorious as a weed.