Perennial Ryegrass is the most widely grown cool-season grass in the world. It is a strong perennial grass when grown in cool, temperate areas. In South Africa, with hot summers and (in some areas) low soil fertility, it is considered as a weak perennial. It grows strongly during spring and autumn, with reduced growth during winter (better than Tall Fescue) and poor growth in summer. Leaves are nutritious, soft and highly palatable resulting in good animal production. This grass is best adapted to areas where the annual rainfall exceeds 1500 mm and distribution correlates with the crop’s production curve. In South Africa, it is normally planted under irrigation.