[1] Peas will enrich the soil for a subsequent corn crop. [2] Bean vines ? dug into the earth ? will release nitrogen. [3] Mature sweet clover seedpods. [4] Red clover (Trifolium pratense) and a passerby. [5] Corn grows vigorously with a legume companion. [6] Harvest the brown heads of red clover for seed. [7] White clover (Trifolium repense). [8] A stand of hardy yellow sweet clover (Melilotus officinalis). [9] Wild white sweet clover (Melilotus alva).