Step-by-Step Growing Guide
Lemon balm (Melissa officinalis) is a mint-family perennial that thrives in average, well-drained soil with a pH of 6.0–7.5. It tolerates poor soil but produces the most aromatic leaves in slightly fertile conditions with regular moisture. Start from transplants or division for strongest plants; seed-grown plants are variable. Plant 18–24 inches apart in containers or with physical root barriers to contain spreading — in open ground it will colonize aggressively via underground rhizomes, similar to mint. Grow in a large container (at least 12 inches wide and deep) sunk into the ground to contain spread, or in a dedicated bed with buried root barriers. Water consistently, about 1 inch per week; it wilts dramatically when dry but recovers quickly. Fertilize once in spring with balanced fertilizer — too much nitrogen reduces essential oil concentration and fragrance. Cut plants back hard by half after flowering to encourage a flush of fresh, highly aromatic foliage and prevent excessive self-seeding.