Lemon balm
Melissa officinalis
A cheerful, fast-filling herb for gaps and part shade, loved by bees and useful in the kitchen. Deadhead it, or it self-seeds across the whole plot.
Lemon balm in a syntropic line
Lemon balm belongs in the Ground cover layer as a Secondary productive species. Aim for 2–4 species for resilient, continuous cover. Rough in-row spacing starts around 0.3 m in a syntropic row. Good line partners include Black locust, Blue-leaf wattle. As a Secondary species it carries mid-term yield and structure while climax trees slowly claim the canopy.
Tolerances and growing conditions
- Strata
- Ground cover
- Lifecycle
- Secondary
- Soil preference
- Loam, Sandy
- Soil pH range
- 5.5 – 7.5
- Min. temperature
- -25°C
- Min. rainfall
- 500 mm/year
- Wind tolerance
- Medium
- Frost tolerance
- High
- Growth rate
- Fast
- Irrigation needed
- Medium
- Foliage
- Deciduous
- Waterlogging tolerance
- Low
- Origin
- Europe
- Native to Portugal
- No
How to manage it
Fast, hardy pollinator herb that tolerates part shade; cut back after flowering for fresh regrowth and to prevent seed set.
How to propagate
Sow seed in spring or autumn, or divide spreading clumps anytime in growing season.
Guidance, not a guarantee — success varies by species and skill.
What to watch out for
Self-seeds prolifically and spreads by root - can become weedy if flower heads are left to set seed.
Frequently asked questions about Lemon balm
Is lemon balm frost-hardy?
Yes for winter cold in many climates — generally hardy to around -25°C when dormant, with high frost tolerance in the catalog. Flowering crops can still lose a season to late frost, so site them carefully.
What soil does lemon balm need?
It does best on loam, sandy ground, at pH about 5.5–7.5.
How much water does lemon balm need?
Plan for a rainfall floor around 500 mm/year, plus medium irrigation once established.
Can lemon balm handle wet or waterlogged soil?
Poorly — lemon balm has low waterlogging tolerance, so keep it off winter-wet clay and standing water.
What should I watch out for with lemon balm?
Self-seeds prolifically and spreads by root - can become weedy if flower heads are left to set seed.
Lemon balm in soil templates
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