Lemon Balm is a perennial culinary herb, grown for the flavor it brings to the kitchen, ready to harvest about 70 days after planting. It's hardy across USDA zones 3 through 7 and stands up to deer. Its summer flowers are a moderate draw for honeybees and native bees, even though the harvest is the prize.
Zones
3-7
pH Range
4.5-7.8
Sun
Full Sun
Days to Maturity
70
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What Lemon Balm is
Lemon Balm grows as a perennial and reaches around two feet at maturity. It blooms white in summer. It's also deer-resistant.
How to grow Lemon Balm
Lemon Balm grows in USDA zones 3 through 7 and is ready to harvest about 70 days after planting. Lemon Balm does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.5 to 7.8, on well-drained ground. It needs around 900 growing degree days to mature and a growing season of at least 60 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-7
USDA PHZM 2023
Soil pH
4.5 - 7.8
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
42.8°F
plant_species_v5.csv
Days to Maturity
70 days
Lemon balm; perennial; cut-and-come-again.
UMD-Herb; RHS
GDD Required
900+
plant_species_v5.csv
Mature Height
2 ft
plant_species_v5.csv
Frost-Free Days
60+
plant_species_v5.csv
Start the season right
Plant lemon balm in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Lemon Balm prefers pH 4.5 to 7.8 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Lemon Balm is ready about 70 days after planting (UMD-Herb; RHS). Snip sprigs as you need them — regular cutting keeps the foliage tender and slows it bolting to flower.
Good to know
Good news for pet owners — lemon balm isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Lemon Balm offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Lemon Balm thrives
Lemon Balm is hardy across USDA zones 3 through 7. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 3–7·Where Lemon Balm growsOpen map →
On USDA hardiness-zone overlap, Lemon Balm can grow in these states:
See if Lemon Balm will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether lemon balm actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Lemon Balm in my zone?
Lemon Balm grows in USDA hardiness zones 3 through 7 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Lemon Balm take to grow?
Lemon Balm is ready to harvest about 70 days after planting (UMD-Herb; RHS). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Lemon Balm?
Most growers plant lemon balm after the last spring frost, once the soil has warmed, leaving enough of the season for its 60-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Lemon Balm need?
Lemon Balm needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Lemon Balm need?
Lemon Balm prefers soil pH 4.5 to 7.8, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Lemon Balm attract pollinators?
Yes — lemon balm's flowers are a solid nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Lemon Balm safe for pets?
Lemon Balm is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.