[Cal-IPC] Invasive: Dactylis glomerata (orchard grass) is an aggressive perennial grass (family Poaceae) widespread throughout California. It grows in any type of soil, is drought resistant, and can overrun some grasslands. Orchard grass is a desirable pasture grass but has escaped cultivation in many natural areas throughout the United States. Cal-IPC Rating: Limited (link added by Mary Ann Machi)

[Wikipedia] Europe, Asia, Africa native: Dactylis glomerata, also known as cock's-foot, orchard grass, or cat grass (due to its popularity for use with domestic cats) is a common species of grass in the genus Dactylis. It is a cool-season perennial C3 bunchgrass native throughout most of Europe, temperate Asia, and northern Africa. (link added by Mary Ann Machi)