(Artemesia annua) Large plants are grown for their sweet fragrance and used as a base for dried wreaths and other dried arrangements and crafts. Also popular as a filler in fresh arrangements. Harvest Sweet Annie when flowers appear along the stems. Make sure to let some flowers go to seed if you want more plants from reseeding the following season. 5-7 feet. Full sun. Seeds should be planted in cold conditions - from November through late April. Reseeding annual. 200+ seeds.