Annual.
Dill is one of the easiest herbs to grow and would make a great first herb for someone who has never grown herbs before. You'll find lots of uses for both the fronds and the seeds in the kitchen. A sprig of dill will perk up almost any soup, salad, or main dish.
Dill likes to be planted in cool weather. In warm winter areas that don't experience a hard frost, you can plant dill in fall or winter. In cooler areas, plant dill a week or two before your last hard frost. After the first sowing, plant again every 10 days or so for a continuous crop.
When growing in containers, use a deep container to accommodate the long roots, and remember that you will eventually have a plant that is three feet tall. Plants grown in containers may require staking.