Dill Growing Information Anethum graveolens Direct Seed: Every 3 weeks for greens. Soil temperature for germination is 60-70° F. Spacing: Seed ½" apart in rows that are 12” apart, at ¼" depth. Can be thinned to 4” apart for full plant harvest. Growth needs: Grows best in fertile, light soil. Harvest: When stems are of desired height until plants begin to flower for greens. Flowers can be harvested once seeds are gold. Both greens and flowers can be used fresh or dried.