If you want to print this publication, we recommend downloading the PDF version. Annual ryegrass is an erect, robust cool-season bunch grass that reaches a height of 3 to 4 feet. This species has a heavy, extensive, fibrous root system.
Seedlings quickly establish a ground cover and are very competitive.
Annual ryegrass flowers in late May to early June and matures seed by late June to early July. Environmental preferences and limitations Annual ryegrass is tolerant of a wide range of soils and climates but is best adapted to valley and coastal areas with long seasons of cool, moist weather. It tolerates cold and can germinate in cooler soils than can most other cover crops. Annual ryegrass can grow on sandy soils but does best on heavier clay or silty soils with adequate drainage. Although well-drained soils are preferred, annual ryegrass tolerates extended wet periods and temporary flooding.