Lemon Balm | Melissa officinalis. This super hardy perennial has been used for generations as a medicinal herb, It will produce fragrant green foliage. Mix with Moroccan mint and lemon verbena for a refreshing tea. Height 60cm. Prefers sun with a little shade. Good for bees and butterflies. Medicinally is used to reduce stress and anxiety, promote sleep, improve appetite and to aid digestion.