This versatile plant can be grown as a vegetable and eaten like other greens or, if allowed to flower and go to seed, mustard seeds can be harvested and used as a spice in cooking and pickling or ground into a popular condiment. Bright green leaves are great for salad mix or full-size bunches. Mustardy hot taste mellows when cooked. They enjoy cool weather and will bolt (flower) quickly in warmer weather. Annual.