Alfalfa (Medicago sativa) is a fast-growing legume valued as a cover crop, green manure and forage. As a nitrogen-fixer it feeds tired soil, while deep roots break up compaction and draw up nutrients from below. Broadcast over bare beds in spring or late summer and turn under before flowering to build organic matter for the next crop. This 1 lb bag also sprouts readily for fresh, nutrient-dense sprouts.