Buckwheat (Fagopyrum esculentum) is a grain crop or short-season cover crop that’s perfect for backyard gardeners and small farmers. It’s quick-growing and can help growers attract pollinators, suppress weeds, add organic matter to the soil, and break down slow-release fertilizers. It’s easy to grow and easy to sneak in between summer and fall crops. Learn more about the benefits of growing buckwheat as a cover crop and how to use it in your crop rotation.
Why Grow Buckwheat?
Buckwheat offers many benefits depending on how you use it.
Weed Suppression
Buckwheat grows at near lightning speed. It’s ready in 30 to 45 days as a green manure crop or 80 days for grain production. This fast growth means that buckwheat is excellent for smothering warm-weather annual weeds. For best weed suppression, you want to sow buckwheat fairly densely. We recommend about one pound of seed for every 400 square feet.
Nurse Crop for Clover
Typically, we experts recommend buckwheat as a spring and summer cover crop, but in the southeast we also recommend it for fall and early winter when paired with crimson clover or other cool-season cover crops. Buckwheat acts as a nurse crop for the crimson clover during the heat of the day, and in the fall, it is killed by frost.
Support Beneficial Insects
Buckwheat’s dense, branching clusters of flowers are rich sources of nectar that support bees and other beneficial insects. It’s especially effective in attracting parasitic wasps, pirate bugs, lacewings, lady beetles, hover flies, and other predatory insects which feed on pests like aphids, thrips, caterpillars, and other pests.
Buckwheat flowers in about four to five weeks and continues flowering for up to 10 weeks. If you want to support beneficial insects like pirate bugs, let your buckwheat flower for at least 20 days so that the insects have time to complete their life cycle.
Break Down Slow-Release Fertilizers
Buckwheat’s unique root system produces mild acids, allowing the plants to break down and take up phosphorous and other minerals. When the buckwheat residue decomposes, these minerals become accessible to other crops.
Soil Improvement
For those looking to loosen and improve their soil, buckwheat is also a great option. In the top ten inches of soil, buckwheat creates a dense root system that leaves the soil loose and perfect for the next crop in a low or no-till system.
While buckwheat doesn’t fix nitrogen like legume cover crops do, it can help hold it. The plants grow quickly and take up nitrogen from the soil, preventing its loss through erosion. When you’re ready for the next crop, till in the buckwheat and it will release the nitrogen back into the soil.
When left until flowering, buckwheat also produces a good bit of organic matter, which you can till in or cut and leave on the surface. When left on the surface, it works well as a mulch for fall crops.
Adding Buckwheat to Your Rotation
Buckwheat seeds rot easily in cold, wet soil, and the plant is very susceptible to frost, so wait until your soil has warmed and all danger of frost has passed before planting buckwheat in spring. Burying buckwheat too deeply can also rot the seeds, but you don’t want to leave it on the surface either. After broadcasting your buckwheat seeds, it’s best to rake or harrow them into the soil. As your buckwheat germinates, reseed any bare spots for best results.
Buckwheat will grow well in infertile soil, but it will do poorly in heavy, wet soil. It’s often a top choice for newly cleared land, as nitrogen-tie up from woody debris and decaying roots won’t impact its growth.
We frequently use buckwheat’s fast growth to fill in gaps in the summer and keep soil covered between spring or summer and fall crops. Extreme afternoon heat in the summer can cause buckwheat to wilt, but it will bounce back overnight. In hot, dry periods, you’ll need to water buckwheat.
You can also rely on buckwheat as a quick-growing emergency cover crop in the event of crop failure. We like to leave the soil bare as little as possible.
In fall and winter, you can use buckwheat as a nurse crop for cool-season cover crops before frost. You can also allow buckwheat to winter-kill and use it as a mulch for planting late winter or early spring crops.
Managing Buckwheat
Buckwheat rarely has problems with pests or diseases, but it can become a bit of a nuisance in itself. To avoid buckwheat self-seeding, cut or kill your crop before it has flowered for more than a week. Thankfully, the tender stems make buckwheat easy to scythe or mow down.
If you don’t need that plot in the following season or year, you can also allow buckwheat to self-seed. As buckwheat is frost-sensitive, you may want to replace it with a cold-tolerant legume or other cover crop for winter.






