[Cal-IPC] Invasive: Festuca arundinacea (tall fescue) is a perennial grass with coarse foliage (family Poaceae) found throughout California except in the Great Basin and deserts. It favors sites with heavy soil, including grassland, coastal scrub, roadsides, ditches and other disturbed sites. Tall fescue is commonly planted for turf and hay or erosion control, but it has escaped cultivation and invaded wild areas. After tall fescue plants die, their leaves fall to the ground and create a thick thatch which prevents native plant seeds from germinating. Cal-IPC Rating: Moderate (link added by Mary Ann Machi)

[Wikipedia] Europe native: Festuca arundinacea (syn., Schedonorus arundinaceus and Lolium arundinaceum) is a species of grass commonly known as tall fescue. It is a cool-season perennial C3 species of bunchgrass native to Europe. It is an important forage grass throughout Europe, and many cultivars have been used in agriculture. It is also an ornamental grass in gardens, and a phytoremediation plant. (link added by Mary Ann Machi)