One of your best bets is winter rye (Secale cereale), the grain used to make rye flour (not ryegrass, which is a different plant). Winter rye loves cold weather, and it’s widely adapted, inexpensive and easy to sow. According to Managing Cover Crops Profitably, published by the Sustainable Agriculture Research and Education (SARE) program, rye will even germinate in temperatures as low as 34 degrees Fahrenheit, and will grow through winter wherever temperatures stay above about 38 degrees……….
Ordering cover crop seeds by mail can be a bit pricey, but saving your own rye seed is easy. Order seed by mail if you can’t find a local supplier, and then sow it in fall. Allow it to grow through the following spring until June, when it will produce seed heads. ……….
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Article source: Mother Earth News
Image source: Old World Garden Farms