Green and purple kale make a hearty cover crop
These buckwheat sprouts grow last and, like other grains, they can add rich organic matter to the soil.
Kris Wetherbee shovel-tills a garden bed before sowing the season's cover crops.
Snow peas are cold-hardy and edible.
PHOTO: MOTHER EARTH NEWS STAFF
Alfalfa's aggressive roots can be hard to handle
An array of cover crop seed, including clover, fava bean, field pea, winter wheat and hairy vetch. Legumes, grasses and grains grown together work to hold nitrogen in the soil.