Perennial Ryegrass

Perennial ryegrass is a short-lived perennial that comes in turf-, pasture- and hay-adapted varieties. The pasture-adapted varieties tend to have finer leaves and smaller and more numerous tillers, and are later maturity than the hay varieties. Perennial ryegrass is early and vigorous in the spring, and grows well into the fall, but is unproductive during the hot, dry summer months. Winterkill is promoted by excessive top growth going into the winter. Perennial ryegrass may winterkill in alfalfa mixtures that are left to overwinter with considerable fall growth. Perennial ryegrass is not well adapted to areas with prolonged ice cover and extreme cold without adequate snow cover.