Question: What is the right way to grow and harvest dill for the leaves and for seed?
Answer: Dill grows best in full sun on well-drained soil. It doesn't transplant easily so sow seeds after danger of frost has passed, and continue sowing every few weeks until midsummer to have dill maturing throughout the summer and fall. When seedlings are two inches tall, thin to 10 inches apart in the row. Keep well watered and weeded.
For the best flavor, harvest dill just before the umbrella-like flower clusters open. Only harvest as much as you'll need that day, since dill loses its flavor quickly. For seeds, cut the flower stalks before the seeds ripen and turn a tan color. Place a paper bag with a few holes poked for air circulation, over the seed heads. Hang the stalks upside down in a warm, well-ventilated room out of direct sunlight. As the seeds ripen, they will drop into the bag.