Ryegrasses were brought to the USA from Europe and are now grown and planted throughout the country. These bunch grasses have two basic types; annual and perennial. Each type is planted as a pure strain or used in mixtures depending on the specific lawn use desired. Do not confuse these two kinds as being the same. They are adapted into our lawns mainly for their fast growing ability as a cool season grass. Perennial is a permanent lawn choice in more cooler climate areas, and annual is seeded yearly and lives for one season.