Grow indoors or outdoors for year-round onion flavoring. Use chopped leaves and young flowers to add flavor and decorative garnish to salads. Medicinal: A tonifying and healthful herb. The essential oil is highly antibacterial. How to Grow: Perennial to zone 3. Germination: 60-70°F, needs darkness to germinate, Transplant or direct seed. Full sun or part shade. Height 12 inches. Packet (0.2 g) 183 seeds. 80 days. Allium schoenoprasum.