Buckwheat as a Cover Crop
Broadleaf cover crop
Buckwheat (Fagopyrum esculentum) is a fast-growing, warm-season broadleaf plant that is widely used as a short-term summer cover crop. It is not a grass or a grain in the true cereal sense, and it is not a legume, so it does not fix nitrogen. Gardeners and small farmers value it mainly as a quick "catch crop" that covers bare ground and can be fit into short windows between other plantings.
Benefits
Buckwheat's greatest strength is speed: it germinates and canopies quickly, shading the soil and crowding out many summer weeds. It produces a modest amount of leafy biomass that adds organic matter when turned under, helping to feed soil life and improve tilth over time. Its dense, shallow roots hold surface soil in place and reduce erosion and crusting during the summer. Buckwheat is also noted for taking up and holding nutrients such as phosphorus in a form that can become available to later crops, though it does not add nitrogen the way legumes do. Its flowers are attractive to bees and many beneficial insects.
When to plant
Plant buckwheat in late spring through summer, after the danger of frost has passed and the soil has warmed, since it is quite sensitive to cold. It is typically broadcast or drilled onto a firm, moist seedbed and lightly raked or rolled in for good soil contact. Seeding ranges are usually given in pounds per thousand square feet for gardens or pounds per acre for fields; your local Cooperative Extension can suggest a rate suited to your region and goals.
Growing it
Buckwheat grows rapidly and often reaches flowering within about four to six weeks, forming a knee-high stand of branching stems and heart-shaped leaves. It tolerates poor or low-fertility soils better than many crops and generally needs little care once established, though it does poorly in drought and in heavy, waterlogged ground. Because it is frost-tender, it is grown only during the frost-free part of the season.
Ending the cover crop
The simplest way to end buckwheat without chemicals is to mow, cut, or crimp it at early flowering, before it sets mature seed, then leave the residue on the surface or work it into the soil. Turning or tilling it in while it is still green and succulent lets it break down quickly and return organic matter to the soil. If left too long it can drop seed and volunteer in later plantings, and any stand caught by fall frost will winterkill on its own.
Best for
Buckwheat suits gardeners and small farmers who need to cover an open bed for just a few weeks in summer, smother weeds, and gain a quick shot of organic matter between spring and fall crops. It is a good fit for short gaps, poor soils, and anyone wanting an easy, fast cover that also supports pollinators.
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.