Thought by 1st-century Romans to be a good luck symbol, dill has been around for thousands of years. This annual herb grows up to a height of about 3 feet and has feathery green leaves called dill weed, marketed in both fresh and dried forms. The distinctive flavour of fresh dill weed in no way translates to its dried form. Fresh dill does, however, quickly lose its fragrance during heating, so should be added toward the end of the cooking time. Dill weed is used to flavour many dishes such as salads, vegetables, meats and sauces.