Blood meal is a quick source of nitrogen. Bone meal has nitrogen and is a quick phosphorus source. Bone meal also slightly increases soil pH, making it more alkaline. Cottonseed meal, too, is a good and rapid nitrogen source. I like fish emulsion, another nitrogen source that is about 5 percent sulfur.
Fish meal is another nitrogen source.
Seeds generally are collected in late summer or fall, when the pods begin to dry. If the seeds are stored in a cool, dry place, they are likely still viable for planting that year. The seeds have a hard coat, and it's a good idea to file or nick the coat with a knife to encourage germination. Seeds are planted outdoors after the soil has warmed, so you can sow them now. Or you can plant the seeds in individual pots that will accommodate a long root.