How to Grow Lemon Balm
Melissa officinalis from Seed
The heart-gladdening herb -- crinkled mint-like leaves releasing a cloud of pure sherbet-lemon fragrance on contact; a Hardy Perennial H7 thriving in clay soils and partial shade where Mediterranean herbs fail; surface sow in light at 20°C; cut back hard after midsummer flowering for a second fresh flush; prolific self-seeder (remove flowers or contain in pots); the finest fresh herbal tea from the garden; an intense bee magnet (Melissa = Greek for bee)
Lemon Balm (Melissa officinalis) is the herb that has been described as "gladdening the heart" since the ancient Greeks -- a description that anyone who has brushed against its leaves on a warm summer morning will understand immediately. The contact releases a cloud of pure sherbet-lemon fragrance from the crinkled, bright-green, mint-like leaves: clean, bright, citrus-sweet without any sharpness, a scent that is both immediately refreshing and genuinely calming. It is the kind of fragrance that makes people stop walking and reach out to touch the plant again, just to confirm that the leaf really does smell that good.
As a Hardy Perennial H7 that survives temperatures to -20°C, Lemon Balm is one of the most reliable and permanent additions to a cottage herb garden. Once established from seed (typically flowering in its second year), it returns each spring with increasing vigour, producing a substantial bushy mound of aromatic foliage from April through to the first frosts. The summer chop -- cutting the plant back hard to the ground after it flowers in midsummer -- restores it to a compact, productive mound of fresh growth for autumn harvesting. The one management consideration is self-seeding: Lemon Balm produces seed prolifically and self-sown seedlings spread readily. Removing the flower heads before seed sets, or growing in a container, keeps the spread in check.
Quick Facts at a Glance
Plant Type
Hardy Perennial H7 -- to -20°C; dies back in winter; vigorous return each spring
Leaves
Sherbet-lemon fragrance on contact; finest fresh herbal tea; edible in salads and cordials
Height
45-60cm; leafy mound; cut back hard after flowering for second fresh flush
Germination
Surface sow/light; 20°C; 10-20 days; do not cover seeds
Self-seeds
Prolifically -- remove flowers before seed sets or contain in pots
Difficulty
1 out of 5 -- one of the easiest herbs to establish from seed
Understanding the Plant
The Name -- Melissa and the Bees
The genus name Melissa is the ancient Greek word for honeybee, reflecting the plant's extraordinary attractiveness to bees: the small, white, two-lipped flowers that appear in midsummer produce nectar in quantities that make Lemon Balm one of the most intensively bee-visited herbs in any garden. The ancient beekeepers' practice of rubbing hive interiors with fresh Lemon Balm leaves before installing a new swarm was documented by Pliny and Virgil -- the plant's attractiveness to bees made it the ideal bee-luring herb. The RHS Plants for Pollinators designation confirms that this ancient relationship between Lemon Balm and bees continues in the modern garden context.
The Summer Chop -- Restoring Fresh Growth
After Lemon Balm flowers in midsummer (typically July), the plant can look tired and somewhat straggly. This is the moment for the summer chop: cut the entire plant back hard to within 5-10cm of the ground. This looks brutal but produces exactly the right result -- the plant responds within 2-3 weeks with vigorous fresh growth from the base, producing a second mound of bright, intensely fragrant young leaves for the autumn harvesting season. This second flush of young leaves has the most concentrated lemon fragrance and is the best material for fresh herbal tea, summer cordials, and culinary use.
Managing Self-Seeding -- Container Growing Option
Lemon Balm self-seeds prolifically in suitable garden conditions -- a single flowering plant in a moist, partly-shaded position can produce hundreds of self-sown seedlings. For gardeners who do not want a spreading colony, there are two approaches: either remove the flower heads before they ripen and set seed, preventing self-seeding entirely; or grow Lemon Balm in a large container (minimum 30cm diameter) where the root spread is contained and self-sown seedlings fall outside the planting area and can be removed. Container growing also allows Lemon Balm to be positioned precisely on a patio or near a seating area where its fragrance can be enjoyed throughout the summer.
Sowing & Growing On
Surface Sow -- Light Required; 20°C; 10-20 Days
Scatter seeds on the surface of moist compost and press gently. Do not cover -- seeds need light. Keep at 20°C. Germination in 10-20 days. Seedlings are small at first -- grow on in bright conditions before potting on into individual containers at 5-6cm.
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Surface sow indoors March-May at 20°C. Do not cover seeds -- light is required for germination. Press seeds gently into the compost surface with a finger. A very light dusting of fine vermiculite can be used to retain moisture without blocking light. Germination in 10-20 days. Seedlings are small initially -- keep in bright conditions at 18-20°C.
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Prick out into individual 9cm pots when seedlings have 2-3 true leaves. Handle by the seed leaf -- Lemon Balm seedlings are delicate initially but establish quickly once they have their own root space. Grow on at 15-18°C in bright conditions.
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Harden off and plant out in spring after frost, in sun or partial shade, 30-45cm apart. Lemon Balm is uniquely among herbs in preferring moist, moisture-retentive soil -- it thrives in clay soils and shaded corners where Mediterranean herbs would fail. Full sun also works well; partial shade produces larger, slightly less intensely flavoured leaves.
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Cut back hard after flowering in midsummer for a second flush of fresh growth. Cut the entire plant to 5-10cm from the ground when the flowers begin to set seed. Water well after cutting. The plant regrows rapidly with fresh, fragrant foliage within 2-3 weeks, providing quality harvest material through autumn.
Growing On & Care
As a Herbal Tea
Lemon Balm makes the finest fresh herbal tea available from a UK garden herb -- far superior in flavour and fragrance to any dried commercial product. Pick a generous handful of fresh leaves (approximately 10-15 leaves per cup), pour over freshly boiled water (not quite boiling -- 85°C is ideal), and steep for 4-5 minutes. The resulting tea is pale golden, delicately lemony, with a gentle sweetness and the characteristic sherbet-citrus tone of the fresh leaf. Add honey if desired. Drink as a calming, digestive, and mood-lifting herbal infusion -- all three properties are well documented in the traditional and modern herbal medicine literature.
Culinary Uses
Beyond tea, Lemon Balm provides a citrus note to any dish without the acidity of lemon juice. Young leaves can be shredded finely into green salads, fruit salads, and any fresh summer dish requiring a lemon-fresh quality. The leaves can be used in cordials and lemonades (steeped in hot sugar syrup and strained for a summer herb cordial). They work well in fish dishes as a garnish, in salad dressings where a lemon-herb note is needed, and in any dessert pairing where lemon and herbs would be welcome. The scent is rapidly lost on drying -- fresh is always preferable, and the plant's perennial nature makes fresh leaves available from spring through to the first frosts.
Bee and Pollinator Value
Lemon Balm's RHS Plants for Pollinators designation understates the degree to which this plant attracts bees. The small white flowers produced in midsummer are visited almost continuously by honeybees, bumblebees, and solitary bees throughout their brief flowering period. A mature Lemon Balm in full flower in July is one of the most intensively bee-worked plants in the cottage garden. Beyond bees, the flowers attract hoverflies and beneficial wasps that are important predators of garden pests.
Medicinal and Calming Properties
Lemon Balm has been used medicinally since antiquity for its calming, anti-anxiety, and sleep-promoting properties. Modern research has confirmed that the rosmarinic acid and flavonoids in the leaves have genuine anxiolytic (anti-anxiety) and mild sedative effects. The traditional preparation as a herbal tea for insomnia and anxiety is one of the best-evidenced traditional herbal remedies. The plant also has antiviral properties (particularly against cold sore virus) and digestive-settling qualities. Growing a Lemon Balm plant in the garden is access to a genuinely useful domestic remedy available year-round.
Container Growing
A large container (30-40cm diameter, deep enough for the fibrous root system to develop) is the ideal solution for gardeners who want Lemon Balm's fragrance and culinary value without the spreading tendency. In a container, the root cannot spread underground and self-sown seedlings fall outside the container boundary and are easily spotted and removed. Position on a patio, near a seating area, or outside a frequently-used door where brushing past the plant triggers the fragrance. The container's mobility allows repositioning for maximum enjoyment throughout the season.
Companion Planting
Lemon Balm is an excellent companion plant for fruit and vegetables requiring pollination. The intense bee-attracting quality of the flowers draws pollinators into the productive garden in July and August, improving pollination of nearby tomatoes, beans, courgettes, and other crops. The fragrant foliage also has some insect-deterrent properties when planted densely. Traditionally, Lemon Balm was grown alongside bee hives and planted in bee gardens specifically for its hive-attracting qualities.
Sowing & Harvest Calendar
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| Sow (Mar-May) |
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| Plant out (May-Jun) |
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| Harvest leaves (May-Oct) |
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| Summer chop (Jul) |
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| Second flush (Aug-Oct) |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Self-seeding spreading out of control | Flowers allowed to set seed | Remove flower heads before seed ripens -- the moment the flowers fade, cut the stems with scissors. Alternatively, grow in a large container to contain root spread and prevent self-sowing in surrounding soil. Self-sown seedlings are easy to identify (distinctive lemon fragrance when touched) and easy to remove while young. |
| Powdery mildew on leaves | Poor air circulation; over-watered in wet conditions | Ensure adequate spacing (30-45cm) for air circulation. Cut back affected plants hard and allow fresh growth. Water at the base rather than overhead. Powdery mildew is more of a cosmetic problem than a serious one -- the plant recovers well after cutting back. |
| Poor germination | Seeds covered; temperature too low | Surface sow without covering -- seeds need light. Maintain 20°C consistently. Below 18°C germination is slow and unreliable. Lemon Balm seeds are small and can look identical to compost particles -- wait patiently for 14-20 days before concluding germination has failed. |
| Floppy, sprawling growth | Over-rich soil; not cut back after flowering | Cut back hard after midsummer flowering to restore compact fresh growth. In very fertile soil, Lemon Balm can become rank and spreading -- lean, moisture-retentive soil produces the most compact and aromatic growth. |
Plant Specifications
Brush the plant and release the sherbet-lemon cloud -- the herb that has been gladdening hearts since ancient Greece
Surface sow in light at 20°C from March-May. Plant in sun or partial shade in moisture-retentive soil. Harvest leaves before flowering for maximum fragrance. Cut the whole plant back hard to 5-10cm after midsummer flowering. Water well. Watch the fresh fragrant growth return within 2-3 weeks. Remove flowers before they set seed if spreading is not desired. This is one of the simplest and most rewarding herbs in the entire garden.
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