Perennial ryegrass is a commonly used turf grass in the cooler-season climate areas of the Northern US. Many people enjoy this seed because, under the right growing conditions, it can be seeded and go to a mowable lawn in about 21 days. It is known for its quicker germination. This characteristic also makes it great for erosion control use to plant and help hold the soil after a project. Perennial Ryegrass is also a common grass used in golf courses in the Northwest and many others. When proper care is provided this grass can grow in a variety of soil types and have a nice green color. Perennial Ryegrass also has a fair amount of durability, but a softer feel, and grows best in full sun to part shade.