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Lemon balm is a fragrant herbaceous member of the mint family prized for its bright lemon-scented leaves. It is used fresh or dried in teas, culinary dishes, and herbal remedies, and also attracts pollinators to the garden. Gardeners grow it for its vigorous growth, ease of cultivation, and reliable harvests throughout the growing season.

Lemon balm seeds require warm soil temperatures of 65–75°F to germinate reliably within 10–14 days. Seeds benefit from light exposure and should be surface-sown or just barely covered; do not bury them deeply. No pre-treatment is necessary, but soaking seeds for a few hours before sowing can speed germination.

Start seeds indoors 6–8 weeks before the last frost date, sowing them on the surface of moist seed-starting mix and keeping them at 70°F in a bright location. Thin seedlings or transplant to individual pots when they reach 2 inches tall. Harden off transplants over a week before moving to the garden after frost danger has passed. Space plants 12–18 inches apart in well-draining soil with a pH of 6.0–7.0. Direct seeding is possible but slower; scatter seeds on prepared soil in spring and keep moist until established.

Water consistently during the first season to encourage strong root development; mature plants tolerate dry spells. Pinch back growing tips regularly to promote bushier, fuller growth and prevent legginess. Fertilize monthly during the growing season with a balanced fertilizer, or mulch with compost to supply slow-release nutrients. Lemon balm rarely suffers from serious pests or diseases but can develop powdery mildew in humid conditions; improve air circulation and avoid wetting foliage to prevent this. Cut back plants in fall or early spring to maintain shape and encourage vigorous new growth.

Begin harvesting leaves 6–8 weeks after transplanting by pinching or cutting the top 6 inches of stems just above a leaf node; this encourages branching and more abundant future yields. Harvest before flowering for the most intense lemon flavour, though the plant will continue producing after flowering. Pick leaves in the morning after dew has dried for the best aroma and oil content. Dry leaves quickly in a warm, well-ventilated area away from direct sunlight, or freeze whole stems in ice cube trays with water for long-term storage. Dried lemon balm retains its flavour for about a year when stored in an airtight container away from light and heat.