Ryegrass is a genus containing up to 10 grass species. Most ryegrass species fall under annual or perennial categories and different varieties are cultivated for pasture, forage, and hay production. Some varieties also serve as great turf grasses.
Any ryegrass species may be available in either tetraploid or diploid varieties. The ‘ploidy’ characteristics arise because tetraploid plants have four sets of chromosomes, while diploid plants have two. Learn more on difference between Tetraploid and Diploid here.