Wild sunflower seeds make delicious sprouts. Harvest the seeds in late fall when the stalks and flower heads are completely dry. Store the seeds in the freezer to help their germination. To sprout, put a layer of potting soil in a shallow container, spread heavily with seeds and cover them with more soil. Keep the soil evenly watered. Harvest by clipping off the sunflower sprouts when they are 1 to 3 inches tall. They also can be sprouted in trays without soil but the results aren't as good.