Use for hot and refreshing cold teas as a lemon substitute. Essential oils are volatile resulting in more fragrance than flavor. Medicinal: Lemon balm has anti-viral action in lab tests against herpes simplex, mumps, and other viruses. Also a sedative, calmative, and carminative. Packet (0.19 g) 345 seeds. Melissa officinalis. Growing instructions: Perennial in zones 4-10. Germination: 70°F, light required, 10 days. Transplant.