The term 'PLANT USED FOR SEASONING' can be broken down into two crossword solutions: HERB (4 letters) and FENNEL (6 letters). Herbs are plants that are used for flavoring food, medicine, or perfume. Common herbs include basil, oregano, rosemary, and thyme. FENNEL is a flowering plant in the carrot family that is native to the Mediterranean region. It has a mild anise flavor and is often used as a seasoning in Italian cuisine.