Is lemon balm invasive?

It can be quite aggressive in the garden, so consider planting it in a container to keep it contained.

Simply snip off the leaves as needed, ideally before the plant blooms for the best flavor.

Plant guide

Lemon Balm.

Melissa officinalis

Pronounced meh-LISS-uh oh-fiss-ih-NAH-liss

Also known as Balm, Beebalm, Common Balm, Lemonbalm, Melissa

Lemon balm is a cheerful, fragrant member of the mint family that is wonderful for tea or just brushing against in the garden. It spreads quite happily, so you might want to keep it in a container to prevent it from taking over your beds. Its bright green leaves have a lovely citrus scent that intensifies when crushed.

At a glance

Care level: Easy
Plant type: Herbaceous perennial
Light: Full sun to partial shade
Indoor light: bright-indirect
Water: Every 3 to 7 days
Mature size: 60 to 90 cm
Growth rate: fast
Hardiness: USDA 4 to 9
Bloom time: Mid to late summer

Care

Keep the soil consistently moist but not soggy to keep the plant happy. Watch for powdery mildew if the air circulation is poor, and trim it back hard after flowering to encourage fresh, bushy growth. It is a vigorous grower that will benefit from regular harvesting.

Watering: Water when the top inch of soil feels dry to the touch.
Feeding: Apply a balanced liquid fertilizer sparingly during the active growing season.
Pruning: Regularly pinch back stems to encourage a bushier habit and prevent legginess.
Repotting: Repot when the roots become crowded or the plant begins to decline in vigor.
Soil: Well-draining, fertile, loamy soil
Soil pH: 6.7 to 7.3
Temperature: -20 to 30°C
Humidity: 40 to 60%
Drought tolerance: moderate
Lifespan: Perennial, typically 5 to 10 years
Fragrance: strong
Deer and rabbits: high

Signs it needs repotting

Roots growing out of the drainage holes.
Water running straight through the pot without soaking in.
The plant stops growing even during the active season.

Safety

People: Lemon balm is generally considered safe for most people when consumed in moderate amounts.
Pets: It is generally safe for cats and dogs, though large ingestions may cause mild digestive upset.
Children: It is generally safe, but always supervise young children to prevent them from eating unknown garden plants.
Contact allergens: Some individuals may experience mild skin irritation if they have sensitive skin.
Airborne allergens: There are no significant airborne allergy concerns associated with this plant.
Edibility: Always verify identification before consuming, as some lookalikes can be toxic.

How to identify it

Opposite, ovate, wrinkled leaves
Toothed leaf margins
Distinct lemon scent when crushed
Small white or pale yellow flowers
Square stems typical of mints

Height: 0.3 to 0.9m
Spread: 0.3 to 0.6m
Leaves: bright green, deciduous
Flowers: white, pale yellow, 0.5 to 1cm

Common problems

Powdery mildew — A white fungal coating appears on leaves when humidity is high and air circulation is poor.
Aphids — Small insects that cluster on new growth and suck plant sap.

Growing it

Propagation: division, seed, cuttings
When to plant: spring, autumn
Overwintering: Cut the plant back to the ground after the first frost. It will go dormant and return in the spring.
In containers: It grows very well in containers, which is recommended to prevent it from spreading too far in the garden.

Division

Dig up the root ball in early spring or fall.
Gently pull the roots apart into smaller sections.
Replant the sections in well draining soil.
Water the new plants thoroughly.

Planting lemon balm near your vegetable patch can help attract helpful bees to pollinate your crops.

Grows well with

Basil — They share similar moisture and light needs in the garden.
Rosemary — Both are aromatic herbs that benefit from similar sunny conditions.

Keep away from

Mint — Both plants are vigorous spreaders and will compete aggressively for space.

Similar species

Catnip — It has a similar growth habit and leaf shape but lacks the distinct lemon scent.

Science

Family: Lamiaceae
Genus: Melissa
Order: Lamiales
Class: Magnoliopsida
Native range: Southern Europe and the Mediterranean region.
Conservation: This plant is common and not of conservation concern.

It thrives in open woodlands and disturbed areas where it can spread through its vigorous root system.

Value to wildlife: nectar source
Pollinators: bees
Uses: culinary herb, herbal tea, pollinator garden, aromatic foliage

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 6/9
Temperature: 5/9
Moisture: 5/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Is lemon balm invasive?: It can be quite aggressive in the garden, so consider planting it in a container to keep it contained.
How do I harvest it?: Simply snip off the leaves as needed, ideally before the plant blooms for the best flavor.

Where the name comes from

Melissa is the Greek word for honeybee, while officinalis indicates it was historically used in medicine.

Good to know

The leaves release a pleasant lemon scent when crushed.
It has been used in herbal traditions for centuries.
It spreads easily through underground runners.
The flowers are small and white or pale yellow.

Is your lemon balm looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.