Lemon balm
Also known as
Common balm, Balm, Balm mint, Sweet balm, Melissa, Garden balm
Keep this plant’s care guide close at hand.
Get the appAbout Lemon balm
Melissa officinalis, commonly known as lemon balm, is a hardy, clump-forming perennial herb in the mint family (Lamiaceae). It grows 30–80 cm tall with square stems and opposite, softly hairy, ovate leaves whose scalloped margins release a bright lemon scent when bruised. Small white to pale cream flowers appear in summer and are rich in nectar, making the plant highly attractive to bees—reflected in its genus name Melissa, Greek for “honeybee.” Native to the Mediterranean Basin and south-central Europe, it has naturalized widely in temperate regions. In gardens and containers it favors well-drained, moderately fertile soils (pH about 6.0–7.5) and regular moisture. Leaves are harvested fresh for teas, desserts, and savory dishes; traditional herbalism values the herb for its mild calming and digestive properties. Plants can spread by short rhizomes and self-seeding, so occasional thinning or deadheading keeps growth in bounds and maintains leaf quality. Frequent pinching encourages bushy, aromatic foliage and delays flowering, which otherwise reduces flavor and fragrance.
Taxonomy
Properties & Requirements
How to care for Lemon balm
Water
Keep soil consistently moist but never waterlogged. Water when the top 2–3 cm (about 1 inch) feels dry, giving a deep soak that drains freely. Containers dry faster and may need watering every 1–3 days in heat; reduce frequency in cool seasons. Morning watering minimizes evaporation and foliar disease. Use well-drained soil and avoid letting the root zone sit in saucers. Mulch lightly to steady moisture and discourage weeds.
Light
Lemon balm thrives in full sun to partial shade. Aim for 6–8 hours of direct sun in mild climates; in hot, arid regions, give morning sun with afternoon shade to prevent scorching and preserve flavor. Indoors, place near a bright south or west window, or supplement with LED grow lights 12–14 hours daily. Leaves grown in brighter light are more aromatic, while deep shade causes legginess and sparse foliage.
Nutrients
Feed sparingly: excessive nitrogen reduces essential oil concentration and flavor. In-ground plants respond well to a light top-dressing of finished compost in early spring and again midsummer. For containers, apply a balanced, organic liquid fertilizer (e.g., 3-1-2 to 5-5-5) at half strength every 3–4 weeks during active growth. Avoid fertilizing in late fall or midwinter. Flush containers with plain water occasionally to prevent salt buildup, and prioritize a loamy, well-drained mix over heavy feeding.
Temperature
Optimal growth occurs between 18–24°C (65–75°F), with good tolerance from 10–27°C (50–80°F). Outdoors it is hardy as a perennial in USDA Zones 4–9, resprouting after winter dormancy. Prolonged heat above 30°C (86°F) can diminish leaf quality; provide afternoon shade and extra water during hot spells. Indoors, keep above 10°C (50°F) and away from drying heat sources. Frost kills tops but crowns usually survive; mulch in colder regions.
