Answer: Members of the legume family--including peas, alfalfa, vetch, clovers, lupines, and beans--have the unique ability to "fix" atmospheric nitrogen. (Actually, it is a bacteria that lives in association with the roots that does the "fixing".) One method is to plant the whole area in a cover crop like white clover; however, a more interesting and attractive option might be to plant any annual flowers you like and plant the paths with a low-growing white clover. Or you could plant the whole area with a plant like Blue Annual Lupine (L. succulentus). <br><br>If you want to go the cover crop route, you might check out Peaceful Valley Farm Supply's catalog (PO Box 2209, Grass Valley, CA 95945, ph# 916/272-4769). They sell a variety of nitrogen-fixing cover crops.
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