Annual Ryegrass as a Cover Crop
Grass cover crop
Annual ryegrass (Lolium multiflorum), sometimes sold as Italian ryegrass, is a fast-growing cool-season grass used as a cover crop in gardens and on small farms. It germinates quickly and produces a dense stand of fine, leafy growth, making it a popular choice for holding soil over the off-season. Gardeners often plant it in fall or early spring to protect and build ground that would otherwise sit bare.
Benefits
As a grass rather than a legume, annual ryegrass does not fix nitrogen, but its dense fibrous root system is very effective at taking up and holding leftover nitrogen and other nutrients that might otherwise wash out of bare soil over winter. Those same fine roots knit the topsoil together, which helps reduce erosion from wind and rain and improves surface structure. The thick top growth shades the ground and can help suppress cool-season weeds by out-competing them for light and space. When the plants are turned under or left to break down, the roots and shoots add organic matter that feeds soil life and supports better tilth over time.
When to plant
Annual ryegrass is usually planted in late summer or early fall so it can establish before cold weather, though it can also be sown in early spring in many regions. Sow the seed into a firmed, moist seedbed and cover it lightly, since good seed-to-soil contact speeds germination; broadcasting followed by light raking works well in a garden setting. General seeding ranges vary by region and planting method, so check with your local Cooperative Extension office for a rate suited to your area.
Growing it
Seedlings emerge quickly and form a low, tillering clump that soon spreads into a solid green cover. It responds to cool, moist conditions and keeps growing through much of the fall, then resumes in spring where winters are mild. Little management is needed beyond keeping the stand from setting seed, but mowing tall growth can keep it manageable and encourage denser cover.
Ending the cover crop
The most important thing is to end the stand before it produces mature seed, because annual ryegrass can reseed itself and volunteer in later crops if allowed to head out. In cold northern areas a hard winter may kill it outright, while in milder regions you will need to mow it close and then turn it under or work it into the soil a few weeks before planting your next crop. Because the roots are tough and fibrous, turning it in while the plants are still young and before flowering makes the job easier; your local Cooperative Extension can advise on timing for your climate and soil.
Best for
Annual ryegrass suits gardeners and small-scale growers who want quick, reliable fall or spring ground cover to catch nutrients and control erosion on open beds. It is a good fit for those who can commit to mowing and incorporating it on time, and who want a low-cost, easy-to-establish grass rather than a nitrogen-fixing legume.
General guidance for US growers. Seeding rates and regional mixes vary; your local Cooperative Extension office and NRCS can help you plan. Page updated Aug 4, 2026.