A type of tall-growing perennial grass, orchard grass is a productive cool-season growing grass that is tolerant of cold and drought. Orchard grass is fast growing, matures quickly in spring months and grows quickly. It is characterized by a dense root system, green to bluish-green color and ranges from 1 to 4 feet tall as it matures. Orchard grass is suited for pastures and well-draining soils and grows well under trees, hence its name.