For most of us, the fall is the time of year for college football (GO DAWGS!), cool, crisp air in the mountains and raking leaves that seem to get everywhere. It is also a time of year when many people consider overseeding their warm season lawns to produce a green carpet of grass all year long. Throughout the years, annual ryegrass has been used to overseed a lawn, but lately the trend has moved to perennial ryegrass.