Hybrids of Harding grass and reed canary grass have been produced. Invasive plants include the diffuse knapweed and reed canary grass. Two widespread invasive species are established in the park, common buckthorn and reed canary grass. It was first isolated from "Phalaris arundinacea" (reed canary grass). Himalayan blackberry, reed canary grass, and sweet clover are introduced species. Some of the major grasses were reed canary grass and blue joint grass. Sedges, rushes, beggars tick, rice cutgrass, and reed canary grass grow in open meadows. In Finland, Reed Canary Grass is a popular energy crop. Such weeds include reed canary grass ("Phalaris arundinacea"). Reed canary grass, if mowed, also forms sod along stream banks. Canary grass is a plant, Phalaris canariensis, belonging to the family Poaceae. These invasive plants include the diffuse knapweed ("Centaurea diffusa") and reed canary grass ("Phalaris arundinacea").