Lemon Balm
Balm, Melissa, Sweet Balm, Common Balm, Beebalm
Hardy perennial for zones 3–9 that self-seeds prolifically — deadhead flowers to prevent spreading. Thrives in partial shade; tolerates poor soil. Cut back hard in midsummer to refresh growth and prevent woodiness. Highly attractive to bees — excellent pollinator plant. Harvest young leaves for best lemon flavor; older leaves become more medicinal.
- Germination
- 10–14 days
- Soil temperature
- 16–21 °C
- Harvest after sowing
- 60–90 days
- Spacing
- 45–60 cm
When to plant lemon balm
Sow outdoors 4–6 weeks before your last spring frost.
Dashed line: typical last spring frost in zone 7 (Apr 5). Zone dates are averages; most of the UK is zone 8–9, central Europe 6–7 and the Baltics and Scandinavia 4–6. In the app, Tomatograph uses your garden's own frost dates.
How to grow lemon balm
- 1
Sow
Sow on the surface 4–6 weeks before the last frost, outdoors or in pots. It germinates readily in cool soil.
- 2
Site
Lemon balm grows well in sun or part shade and tolerates poor soil. Bees love the flowers.
- 3
Control it
It self-seeds freely, so cut off flower heads before they set seed. Cut the plant back hard in midsummer for fresh growth.
- 4
Harvest
Pick young leaves for the best lemon scent, from about 60 days. It is a hardy perennial and returns every spring.
Growing conditions
Light
Partial sun
Water
Medium water
Temperature
-20–30 °C
Frost tolerance
Frost-hardy — tolerates frost
Days to maturity
60–80 days
Ideal soil pH
7–7.5
How Tomatograph watches your lemon balm
Tomatograph checks your local forecast every morning and only speaks up when one of these applies to your garden.
- First frost within 14 daysReminder to mulch the roots before winter.
- 3 days at 35 °C or aboveHeat-wave alert while plants are flowering or fruiting: shade and water early.
- Humidity above 80% for 48 hoursCheck for powdery mildew, which thrives in those conditions.
- Within a week of maturityHarvest-window reminder based on when you planted.
Lemon Balm questions
- When should I plant lemon balm?
- Sow outdoors 4–6 weeks before your last spring frost.
- How long do lemon balm seeds take to germinate?
- Usually 10–14 days at a soil temperature of 16–21 °C.
- How long until I can harvest lemon balm?
- About 60–90 days after sowing, depending on variety and weather.
- How far apart should I plant lemon balm?
- Allow 45–60 cm between plants.
- What grows well with lemon balm?
- Good neighbours include tomato, squash, vegetables.
Growing guide written by Tomatograph. Planting figures from openplantdb (CC0 1.0). Zone frost dates are averages from openplantdb (CC0 1.0).