Perennial Ryegrass can be identified by its leaves that are folded in the bud and membranous ligules that are medium-tall and toothed near the tip. The collar is narrow, and the auricles are short, not clasping the stem. The sheaths are reddish below ground and smooth. This turf grass has leaf blades that can range anywhere from 1/8 of an inch to 1/4 of an inch wide. They are prominently veined above and very shiny and smooth beneath. The seed head forms a long, narrow spike with spikelets that are flattened and without awns.
Perennial Ryegrass has a good tolerance for cold temperatures but doesn't withstand hot, dry weather. Even so, in nothern regions, this turf grass is often lost to winterkill, sometimes making proper turf grass management programs more intensive.