Lemon Balm Melissa officinalis
Soft-leaved, strongly aromatic, and unmistakably lemony when bruised, lemon balm is Melissa officinalis, a perennial member of the mint family. Its wrinkled leaves, square stems, small flowers, volatile compounds, and long relationship with bees make it a fascinating plant far beyond its familiar scent.
What Is
Lemon Balm?
Despite the name, lemon balm is not a citrus plant. It is an aromatic member of the mint family.
A Mint Wearing a Lemon-Scented Disguise
Lemon balm is botanically known as Melissa officinalis. It belongs to Lamiaceae, the mint family, alongside familiar plants such as peppermint, spearmint, basil, rosemary, oregano, sage, thyme, and lavender.
Its common name comes from the fresh lemon-like aroma released from its leaves, particularly when they are rubbed, crushed, or otherwise damaged.
The plant forms leafy clumps of branching stems bearing opposite leaves with conspicuous veins, toothed margins, and a softly wrinkled surface.
It Is Not Related to Lemons
The word "lemon" describes the plant's aroma. Lemon balm is not a lemon tree, citrus species, or member of the citrus family. Its botanical home is firmly within the mint family.
Where Lemon Balm Fits in the Plant Kingdom
The plant's square stems, opposite leaves, aromatic tissues, and flower structure all provide clues to its membership in Lamiaceae.
Lemon Balm Has Some Famous Relatives
Lamiaceae contains an extraordinary collection of aromatic plants. Lemon balm shares several structural traits with these relatives even when their scents are completely different.
Peppermint
Peppermint belongs to the same family and shares the strongly aromatic foliage characteristic of many Lamiaceae plants.
Lavender
Lavender demonstrates the enormous diversity of fragrances that can occur within the mint family.
Rosemary
Rosemary is another aromatic relative, though its narrow leaves and woody growth look very different from lemon balm.
How to Recognize Lemon Balm
Several features work together to give lemon balm its characteristic mint-family appearance.
Opposite Leaves
Leaves typically occur in opposite pairs along the stem, a common arrangement among members of the mint family.
Square Stems
The stems have the four-angled or approximately square cross-section famously associated with many Lamiaceae plants.
Toothed Margins
The leaf edges are distinctly toothed rather than perfectly smooth.
Wrinkled Surface
Prominent veins give the leaf blade a textured, somewhat crinkled or quilted appearance.
Lemon Aroma
Crushing or rubbing fresh foliage releases volatile compounds that create the plant's recognizable lemon-like fragrance.
Branching Growth
Lemon balm forms leafy branching stems and can develop into substantial clumps under favorable growing conditions.
The Leaf Is
the Star
Much of lemon balm's botanical personality is concentrated in its soft, textured, aromatic foliage.
Soft, Veined, Toothed & Aromatic
Lemon balm leaves are generally ovate to heart-shaped, with prominent veins and toothed margins. Their surface often appears wrinkled because of the relationship between the veins and expanding leaf tissue.
Leaves occur in opposite pairs, meaning two leaves arise at approximately the same level on opposite sides of the stem.
The foliage contains specialized structures associated with the production and storage of volatile aromatic compounds. When the leaf is damaged, those compounds are released more readily into the surrounding air.
Rub a Leaf and the Chemistry Escapes
The sudden increase in fragrance after rubbing lemon balm is not the plant creating aroma on demand. Mechanical damage releases volatile compounds already present within its aromatic tissues.
Why Does Lemon Balm Smell Like Lemon?
Its fragrance comes from a mixture of volatile plant compounds. Several of those molecules also occur in other lemon-scented plants.
Citral
Citral refers principally to the closely related compounds geranial and neral. These molecules contribute strongly to lemon-like aromas in numerous plants.
Citronellal
Citronellal is another volatile aromatic compound that can contribute fresh citrus-like characteristics to lemon balm's overall scent profile.
Complex Mixture
The plant's aroma is not produced by a single molecule. Its recognizable fragrance results from multiple volatile constituents interacting together.
Lemon Balm Is Not Lemon
Shared aromatic notes can make unrelated plants smell remarkably similar. Botanical classification tells a very different story.
Melissa officinalis
Lemon balm is an herbaceous perennial belonging to Lamiaceae, the mint family.
Its lemon-like fragrance is associated primarily with volatile compounds in its aromatic foliage.
Citrus limon
The lemon is a woody citrus plant belonging to Rutaceae. Its familiar fruit develops a yellow rind containing aromatic oil glands.
The two plants can share certain aromatic impressions without being close botanical relatives.
Small Flowers With an Important Job
Lemon balm's flowers are much less conspicuous than its foliage, but they reveal another side of the plant and help explain the meaning of its genus name.
Small Blossoms
The flowers are relatively small and may appear pale white, cream, or lightly tinted rather than producing large, showy displays.
Mint-Family Form
The flowers display the bilaterally symmetrical structure characteristic of many members of Lamiaceae.
Pollinator Visits
Flowering lemon balm can attract insects seeking floral resources, including bees.
Why
"Melissa"?
The botanical name carries an old linguistic connection with bees.
Lemon Balm Has a Bee in Its Name
The genus name Melissa comes from Greek and is associated with the word for bee.
That connection is especially fitting for a flowering aromatic plant known for attracting bees to its small blossoms.
The species name officinalis appears in the botanical names of numerous plants with long histories of traditional use and cultivation.
Melissa officinalis
Scientific names are more than labels. They can preserve clues about a plant's relationships, history, appearance, or cultural associations. In lemon balm's case, Melissa carries a centuries-old linguistic connection to bees.
A Perennial That Comes Back
Lemon balm is an herbaceous perennial, meaning the plant can persist for multiple growing seasons even when its above-ground growth changes with the seasons.
Herbaceous
Lemon balm produces nonwoody above-ground stems rather than forming the permanent woody framework of a shrub or tree.
Growth TypePerennial
Unlike a true annual that completes its entire life cycle in one growing season, lemon balm can survive and regrow across multiple years.
Life CycleClump Forming
Established plants can develop substantial leafy clumps with many branching stems arising from the base.
Plant FormSelf-Seeding Potential
When allowed to flower and mature seed, lemon balm may produce new seedlings in suitable surrounding areas.
ReproductionFrom Seed to Lemon-Scented Leaf
The familiar aromatic foliage represents only one stage in lemon balm's repeating perennial life cycle.
01 • Germination
Under suitable conditions, a seed absorbs moisture and begins developing a root and young shoot.
02 • Leaf Growth
The young plant develops opposite leaves and increasingly branched vegetative growth.
03 • Established Plant
As the plant matures, it forms a larger clump of aromatic stems and foliage.
04 • Flowering
Mature stems produce small flowers that contain the plant's reproductive structures.
05 • Seed Formation
Successful reproduction allows fruits and seeds to develop following flowering.
06 • Perennial Return
Established plants can persist from year to year and produce new above-ground growth in subsequent seasons.
A Plant With a Long Journey
Lemon balm has a long association with parts of Europe, the Mediterranean region, and western Asia, and human cultivation has carried it far beyond its earlier range.
Old World Origins
Lemon balm is associated historically with regions of Europe, the Mediterranean, and western Asia.
Long Cultivation
Humans have cultivated and moved lemon balm for centuries, helping expand its geographic distribution.
Naturalized
The plant has become established outside cultivation in various parts of the world where climate and habitat permit its growth.
The Mint-Family Checklist
No single feature should always be used by itself to identify a plant, but lemon balm displays a useful combination of traits associated with Lamiaceae.
Angled Stems
The stems display the distinctly angled form commonly associated with many mint-family plants.
Opposite Leaves
Leaves are arranged in opposing pairs rather than appearing one at a time along alternating sides of the stem.
Aromatic Tissues
Specialized plant chemistry produces the strong fragrance released from damaged foliage.
Bilabiate Flowers
The flowers have the lip-like bilateral organization associated with many members of the family.
Four Nutlets
The mature fruit structure of many Lamiaceae plants separates into four small one-seeded units called nutlets.
Herbaceous Form
Lemon balm combines these traits in a soft-stemmed perennial rather than a woody shrub.
Lemony Does Not Mean Citrus
Lemon-like fragrance has evolved or appears across numerous unrelated plant groups because different plants can produce some of the same or similar volatile aromatic molecules.
Lemon Balm
Melissa officinalis is a member of Lamiaceae, the mint family.
Lemongrass
Plants commonly called lemongrass belong to the grass family, Poaceae, despite their powerful citrus-like fragrance.
Lemon
Citrus limon belongs to Rutaceae and produces its familiar citrus fruit on a woody plant.
Nine Things Worth Remembering
01
Lemon balm's botanical name is Melissa officinalis.
02
It belongs to Lamiaceae, the same family as mint, basil, lavender, rosemary, sage, oregano, and thyme.
03
Lemon balm is not a citrus plant despite its strongly lemon-like fragrance.
04
The plant has opposite leaves and characteristically angled stems.
05
Its leaves have toothed margins and a conspicuously veined, wrinkled surface.
06
Citral-related compounds contribute to the lemon-like character of many aromatic plants, including lemon balm.
07
The genus name Melissa has an ancient linguistic association with bees.
08
Lemon balm is an herbaceous perennial capable of returning across multiple growing seasons.
09
Its small flowers may be far less conspicuous than its leaves, but they are essential to the plant's sexual reproduction.
Questions About Lemon Balm
What is lemon balm?
Lemon balm is Melissa officinalis, an aromatic herbaceous perennial belonging to the mint family, Lamiaceae.
Is lemon balm a lemon plant?
No. Lemon balm is a member of the mint family. Its common name refers to the lemon-like aroma of its foliage rather than a botanical relationship with citrus.
Why does lemon balm smell like lemon?
Its foliage contains volatile aromatic compounds that create a lemon-like fragrance, particularly when the leaves are rubbed or crushed.
What family is lemon balm in?
Lemon balm belongs to Lamiaceae, commonly called the mint family.
Is lemon balm related to peppermint?
Yes. Both lemon balm and peppermint belong to Lamiaceae, although they belong to different genera.
What does lemon balm look like?
It typically has branching stems with opposite, green, strongly veined leaves featuring toothed margins and a somewhat wrinkled surface.
Does lemon balm have square stems?
Its stems are characteristically angled or approximately square in cross-section, a familiar trait among many members of Lamiaceae.
Does lemon balm flower?
Yes. Mature plants produce relatively small, pale flowers that contain the plant's reproductive structures.
Why is it called Melissa?
The genus name Melissa comes from Greek and has an old linguistic association with bees.
Is lemon balm an annual or perennial?
Lemon balm is generally an herbaceous perennial, allowing established plants to persist for multiple growing seasons.
Is lemon balm the same as lemongrass?
No. Lemon balm belongs to Lamiaceae, while lemongrasses belong to Poaceae, the grass family. Their similar common names reflect their lemon-like aromas rather than close botanical ancestry.
What part of lemon balm produces its aroma?
The foliage contains specialized aromatic tissues and volatile compounds. Crushing or rubbing the leaves releases more of these compounds into the air.
A Mint With
a Lemon Signature.
Lemon balm is much more than a lemon-scented leaf. Melissa officinalis carries the structural fingerprints of the mint family in its opposite leaves, angled stems, small flowers, and aromatic tissues. Its volatile chemistry creates a fragrance reminiscent of citrus, while its botanical identity tells an entirely different story: a perennial mint relative with a name connected to bees and a distinctive place in the remarkably aromatic Lamiaceae family.
