A pungent, aromatic herb that can be used fresh or dried. Fresh dill has feathery green leaves. The most useful dried form is dill seeds. In fresh preserving, dill is primarily used for pickling. One head of fresh dill is equivalent to 1 to 2 tsp (5 to 10 mL) dill seeds or 2 tsp (10 mL) dried dillweed.