Melissa officinalis
Family Lamiaceae
Crush one lemon balm leaf and your hand smells like lemon drops for an hour. It brews a gentle, calming tea, rubs on as a folk mosquito-chaser, and pumps out fragrant leaves from a plant that costs almost nothing to keep.
Mint's polite cousin, it stays where you put it — spreading by seed, not by underground ambush — and its modest summer flowers are a quiet bee magnet. Cold-hardy across zones 4-9, happy in sun or part shade. Slip it in near a path you brush past daily.
⚠ Spreads aggressivelyLemon Balm spreads aggressively — mints and their kin send out underground runners and are extremely hard to get rid of once they're in the ground. Grow it in a sunken pot or a fully contained bed, never loose in open soil.
Full Sun to Part Shade
Moderate water
Fast growth
Attracts bees
From the print shop
Our Plant Library collection carries lemon balm — Melissa officinalis, print Nº 271, “Lemon Balm.”
526 designsfrom $12.99white or black backgroundmatte poster, unframed
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what lemon balm actually needs.
Hardy inZones 4-9Lemon Balm · Common problems
1 problem on file
None significant
1 problem on file
Powdery Mildew (crowded plants)Lemon Balm · Growing & propagation
LightWater
Soil
Fertilizer
PruningShear hard mid-summer for fresh flush and to stop seeding.
SpacingPropagateLemon Balm · Seasonal care & spray guidance
early spring
2 jobsSowingIn springSow indoors about 4 to 6 weeks before your last spring frost, or direct sow in early spring. The seed is tiny, so cover it with only a fine layer of soil and keep the surface moist until it comes up. Space plants 16 to 18 inches apart in rich, moist, well-drained soil. Lemon balm seed is very small and slow to germinate, so burying it deep or letting the top dry out before it emerges is what usually costs you the stand.
FeedingIn springWork a general all-purpose fertilizer in as growth starts in spring, and give a second light feeding after a hard harvest cutting. Do not push it beyond that. Over-fertilizing lemon balm drives soft, excessive growth and dilutes the essential oils, so a heavily fed plant gives you more leaf with less lemon in it.
at bloom
1 job
HarvestingAt bloomCut stems as soon as you see flower buds forming, before they open. Take several inches of top growth, handling the leaves gently rather than bruising them. Through the rest of the season you can keep taking about a third of the foliage at monthly intervals, and established plants will give two or three cuttings a year. Leaf essential oil content peaks just before bloom and drops once the plant puts its energy into flowering, so the cutting you take at bud stage is the most aromatic one you will get all year.
as the fruit sets
1 jobPruningAt petal fallAs soon as the flowers finish, cut the plant back hard and remove every spent flower stalk before it can set seed. Water well afterward to help it recover. This one cut does two jobs: it takes the flower heads off before they ripen seed, which is how lemon balm turns into nuisance seedlings all over the bed, and the hard cutback produces a fresh flush of tender new leaves.
the growing season
1 jobThinningThrough summerIn midsummer, cut out some of the crowded interior stems at the base to open the clump to better air circulation. Lemon balm forms dense clumps that hold humidity in the middle, and thinning the interior keeps the plant vigorous and the foliage drier; powdery mildew is the disease to watch for, especially on over-watered plants.
autumn, and putting it to bed
1 jobDividingIn autumnLift and split old clumps in early fall, early enough that the divisions root in before your first frost, or do it in spring instead. Plan on dividing or replacing plants every 3 to 4 seasons. Lemon balm clumps decline and go spindly after three or four years as the crowded center woods up, and dividing early enough in fall gives the new pieces time to put down roots before the ground freezes.
Lemon Balm · Calculators & field guides
Lemon Balm · Yearly calendar
PruneJanuary to December
HarvestJanuary to December
BloomPruneHarvestBloomJune to August
PruneJanuary to December
HarvestJanuary to December
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
Lemon Balm · Ecology & uses
Melissa officinalis
AttractsMoisture
DeerProtect young plants
Origin✓ Commonly eaten
UseTraditional useUseUseEdible value
Traditional use ratingLeaves anytime.
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
Lemon Balm · Varieties & cultivars
Named varieties of lemon balm differ in winter-chill needs, ripening time, hardiness, and whether they set fruit on their own — pick one that fits your climate.
6 varieties
Needs a pollinizer
lemon — Sterile, so it will not self-seed into the rest of the garden and you can skip the deadheading that ordinary lemon balm demands.
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lemon — Entirely golden-yellow foliage. Colors best in partial shade rather than full sun.
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lemon — Leaves blotched and variegated with yellow, showing the color most strongly in spring and fall.
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lemon — Dark green leaves edged in gold. The variegation fades as summer heat comes on.
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lime — Smells of lime instead of lemon. Propagated vegetatively rather than from seed, so grow it from divisions or cuttings.
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lemon — Bred for commercial production and propagated from seed, which makes it the practical choice if you want a uniform planting of any size.
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Sources & plant identity
Melissa officinalis
Hardiness, size and timing vary with your cultivar, soil and climate.
University extension research, brought together with hands-on growing experience at Story Thyme Farms.
Publisher marks identify sources, not sponsorship or endorsement.
Lemon Balm questions, answered straight.
Lemon Balm is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
Leaves anytime.
Division or seed.
Where lemon balm sits in the library.
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