The yellowed fennel seeds are the best. According to the query of relevant information, good-quality fennel seeds are earthy yellow or yellow-green in color, shaped like rice, large and long, full in texture, bright and bright, with a strong licorice aroma, and the stems and impurities are relatively small. few. Bad fennel is green in color, uneven in size, and contains a lot of impurities and dust when picked. It smells bad, no licorice aroma. Fennel seeds are the dried and mature fruits of fennel, a plant in the Umbelliferae family.