# Plant Monograph: Lemon Verbena
**Name of plant:**
Lemon Verbena
**Catch phrase (Carmina Gadelica or traditional invocation if available):**
No specific invocation to lemon verbena is recorded in the *Carmina Gadelica*. No historically attested Gaelic blessing specifically associated with *Aloysia citrodora* is known. A fitting traditional epithet is **“the fragrant leaf”**, reflecting its long use as an aromatic household herb and its exceptionally lemon-scented foliage.
**Family:**
Verbenaceae — the verbena family
**Genus and species:**
*Aloysia citrodora* Paláu
**Other names:**
Lemon verbena; Lemon beebrush; Lemon-scented verbena; Cedrón; Hierba Luisa; Luisa; Hierba de la Princesa; María Luisa; Aloysia triphylla; *Lippia citriodora*; *Verbena triphylla*; *Verbena citriodora*; Verveine odorante; Lúcia-lima.
**Brief introduction:**
Lemon verbena is a strongly aromatic perennial shrub native principally to South America, particularly Argentina and Chile. It was introduced to Europe during the eighteenth century and became valued as a fragrant garden, culinary and medicinal plant. Its narrow, lance-shaped leaves release an intense lemon fragrance when bruised, owing principally to their volatile oil. ([Plant Toolbox][1])
The plant may reach several metres in its native environment but is generally smaller in cultivation. It produces small white to pale lilac flowers during summer and early autumn. Its leaves are traditionally prepared as an aromatic tea and are also used in desserts, fruit dishes, preserves and beverages. ([Plant Toolbox][1])
Lemon verbena has an especially interesting history as a **South American plant adopted into European herbalism**. Traditional uses include digestive complaints, flatulence, insomnia, nervous tension and rheumatic complaints. Modern research has increasingly investigated its effects on sleep, anxiety, oxidative stress and inflammation. ([PubMed][2])
**Traditional uses:**
* As an aromatic digestive tea for indigestion, bloating and flatulence.
* As a calming herb for nervous tension and agitation.
* As a traditional aid to sleep and rest.
* For rheumatic and musculoskeletal discomfort.
* As a fragrant household beverage and culinary herb.
**Historical use:**
* Indigenous and traditional South American medicine used lemon verbena for digestive complaints, diarrhea, flatulence and other gastrointestinal disturbances. ([PubMed][2])
* Traditional medicine also employed the plant for insomnia and nervous complaints.
* South American herbal traditions used preparations of the leaves for rheumatic and inflammatory complaints. ([PubMed][2])
* Following its introduction into Europe, lemon verbena became a popular aromatic garden plant and was cultivated for its fragrant leaves and essential oil. ([Plant Toolbox][1])
* European herbal and culinary traditions adopted the leaves for teas, cordials, desserts, preserves, potpourris and aromatic preparations.
**Parts used and method of use:**
* Leaves — the principal medicinal and culinary part.
* Flowering aerial portions — occasionally included in aromatic preparations.
Used as:
* Herbal infusion or tea.
* Decoction.
* Culinary flavouring in desserts, fruit dishes, jams and beverages.
* Aromatic preparation, including essential oil and perfumery products.
The European Medicines Agency specifically recognizes **lemon verbena leaf (*Verbenae citriodorae folium*)** as the medicinal herbal substance and describes comminuted leaf prepared as a herbal tea. ([European Medicines Agency (EMA)][3])
**Use in healing (modern herbal practice):**
* Relief of mild symptoms of mental stress.
* As a traditional aid to sleep.
* Symptomatic treatment of mild gastrointestinal complaints, particularly bloating and flatulence.
* As a traditional digestive and antispasmodic herb.
* Investigated as a complementary herb for anxiety, oxidative stress, inflammation and other conditions.
The EMA recognizes lemon verbena leaf as a **traditional herbal medicinal product** for mild mental stress, assistance with sleep and mild gastrointestinal complaints. The EMA's classification is explicitly based on longstanding traditional use rather than well-established clinical efficacy. ([European Medicines Agency (EMA)][4])
**Pharmacology and biochemistry:**
* **Verbascoside (acteoside)** — one of the principal phenolic constituents of lemon verbena extracts.
* **Geranial and neral (citral)** — major volatile constituents responsible for much of the characteristic lemon aroma.
* **Flavonoids and phenolic compounds**, including luteolin and related derivatives, together with other terpenoid constituents.
Mechanisms:
* Experimental studies suggest antioxidant and free-radical-scavenging activity from verbascoside and other phenolic constituents.
* Experimental research indicates modulation of inflammatory signalling and oxidative-stress pathways.
* Animal and cellular studies suggest possible anxiolytic, sedative, neuroprotective and smooth-muscle effects, although the mechanisms responsible for human clinical effects have not been fully established. ([PubMed][2])
**Overall profile:**
Lemon verbena is best characterized as an **aromatic digestive and mildly calming herb**, with promising experimental antioxidant, anti-inflammatory, anxiolytic and sedative properties. Its principal phytochemical distinction is the combination of **citral-rich essential oil and verbascoside-rich polar extracts**. Human research is emerging, particularly around sleep, but remains insufficient to establish the plant as a treatment for significant medical disease.
**Common dosage:**
* **For mild mental stress:** 5 g comminuted leaf in 100 mL boiling water, prepared as a decoction, up to 3 times daily.
* **For sleep:** 1–2 g comminuted leaf in 200 mL boiling water, as an infusion approximately 30 minutes before bedtime.
* **For bloating and flatulence:** 2–3 g comminuted leaf in 200 mL boiling water, 1–3 times daily.
* **Alternative digestive infusion:** 1 g comminuted leaf in 200 mL boiling water, up to 5 times daily.
These are the traditional-use doses specified in the European Medicines Agency monograph for adolescents, adults and elderly people. The EMA advises that children should not be given medicinal lemon verbena preparations because adequate data are lacking, and recommends professional assessment if symptoms persist for more than two weeks. ([European Medicines Agency (EMA)][3])
**Safety factors (including side effects):**
* Lemon verbena leaf preparations are generally considered reasonably well tolerated when used according to traditional preparations; the EMA reports no known undesirable effects in its monograph. ([European Medicines Agency (EMA)][3])
* Its calming effects may impair alertness in some individuals; caution is appropriate before driving or operating machinery.
* Hypersensitivity to lemon verbena or other members of the Verbenaceae is a contraindication.
* Pregnancy and breastfeeding are not recommended for medicinal use because adequate safety information is unavailable. ([European Medicines Agency (EMA)][5])
* Concentrated essential oil should not be treated as equivalent to a traditional leaf infusion; reproductive, genotoxicity and carcinogenicity data are insufficient for confident long-term safety conclusions. ([European Medicines Agency (EMA)][3])
**First aid / adverse reaction response:**
* **Mild gastrointestinal upset:** discontinue use and allow symptoms to resolve; seek medical advice if persistent.
* **Excessive drowsiness or impaired coordination:** discontinue use, avoid driving or machinery, and seek medical advice if severe.
* **Skin irritation from concentrated essential oil:** remove the preparation and wash the affected area thoroughly; seek medical attention for persistent or severe irritation.
* **Allergic reaction:** discontinue immediately; seek emergency medical attention for difficulty breathing, facial/tongue swelling or rapidly developing systemic symptoms.
**Drug interactions:**
* **Sedative or sleep medications:** a theoretical additive sedative effect is possible because lemon verbena has experimental and traditional calming properties.
* **Other CNS depressants:** concentrated preparations could theoretically increase drowsiness.
* **Blood-pressure or cardiovascular medications:** experimental evidence is insufficient to establish a clinically significant interaction, but caution is reasonable with concentrated preparations.
* **General interaction considerations:** the EMA reports **no interactions with medicinal products**, but also notes that clinical pharmacokinetic and interaction data are limited. ([European Medicines Agency (EMA)][3])
**Horticultural requirements:**
* USDA / Canadian zone: **USDA Zones 8–10** as a hardy perennial; in most of Canada it is best treated as a container plant or tender perennial brought indoors for winter. ([Plant Toolbox][1])
* Soil pH: **approximately 6.0–7.5**, preferably fertile, light and well drained.
* Light requirements: **Full sun**.
* Moisture: **Moderately moist**, fertile, well-drained soil; avoid prolonged waterlogging.
* Other notes (growth habit, harvest timing, etc.):
* **Growth habit:** Woody, erect, multi-stemmed perennial shrub. It may reach 6–8 feet in favourable cultivation and considerably larger in its native environment. ([Plant Toolbox][1])
* **Flowering/fruiting:** Small fragrant white to pale lilac flowers generally appear from midsummer into early autumn. ([Plant Toolbox][6])
* **Harvest timing:** Leaves may be harvested throughout the growing season. For maximum fragrance, harvesting shortly before flowering is particularly useful.
* **Habitat:** Native to South America, especially Argentina and Chile; now cultivated widely in warm temperate and subtropical gardens. ([Plant Toolbox][1])
* **Propagation/cultivation notes:** Stem cuttings are generally preferred because seed production can be unreliable. In cold climates, grow in a container and bring indoors before frost. The plant may lose its leaves during winter dormancy indoors; prune in early spring to encourage a compact, bushier plant. ([Plant Toolbox][1])
**Sampling of clinical reports / studies:**
* **Insomnia clinical trial:** A randomized, double-blind, placebo-controlled trial involving 100 patients with insomnia found significantly improved Pittsburgh Sleep Quality Index and Insomnia Severity Index scores after four weeks of a standardized *A. citrodora* preparation. ([PubMed][7])
* **Sleep-quality study:** A 2024 randomized, double-blind controlled study involving 71 healthy subjects with sleep disturbances found improved sleep-quality measures after 90 days of lemon verbena extract compared with placebo, including improvements in actigraphy-derived sleep measures and nocturnal melatonin levels. ([PubMed][8])
* **Phytochemical/pharmacological review:** A comprehensive review identified neral and geranial as major essential-oil constituents and verbascoside as a significant extract constituent, while reporting experimental antioxidant, anxiolytic, neuroprotective, antimicrobial and sedative activities. The authors emphasized the need for additional well-designed human studies. ([PubMed][2])
* **Anxiety aromatherapy study:** A randomized clinical trial involving 84 women undergoing cesarean delivery found that inhalation of lemon verbena essential oil was associated with reduced preoperative anxiety, although the study authors called for further research. ([PubMed][9])
* **Overall assessment of evidence:** Lemon verbena has **substantial traditional and ethnobotanical evidence, good experimental pharmacological evidence, and an emerging but still relatively small human clinical literature**. The most interesting contemporary evidence concerns **sleep and mild psychological stress**, while its traditional digestive applications remain an important part of its herbal identity. The EMA nevertheless classifies its medicinal indications principally on the basis of longstanding traditional use rather than established clinical efficacy. ([European Medicines Agency (EMA)][4])
**A particularly useful distinction for the monograph collection:** Lemon verbena should not be conflated with **common vervain (*Verbena officinalis*)**. They belong to different genera, and although both have a long history in European and traditional herbalism, *Aloysia citrodora* is the intensely lemon-scented South American shrub. Its history is consequently quite different from that of European vervain.
[1]: https://plants.ces.ncsu.edu/plants/aloysia-citriodora/?utm_source=chatgpt.com "Aloysia citriodora (Lemon Beebrush, Lemon Verbena) | North Carolina Extension Gardener Plant Toolbox"
[2]: https://pubmed.ncbi.nlm.nih.gov/29698776/?utm_source=chatgpt.com "Aloysia citrodora Paláu (Lemon verbena): A review of phytochemistry and pharmacology - PubMed"
[3]: https://www.ema.europa.eu/en/documents/herbal-monograph/final-european-union-herbal-monograph-aloysia-citrodora-palau-syn-aloysia-triphylla-lher-kuntze-verbena-triphylla-lher-lippia-citriodora-kunth-folium_en.pdf "Verbenae citriodorae folium - MO"
[4]: https://www.ema.europa.eu/en/medicines/herbal/verbenae-citriodorae-folium?utm_source=chatgpt.com "Verbenae citriodorae folium - herbal medicinal product | European Medicines Agency (EMA)"
[5]: https://www.ema.europa.eu/en/documents/herbal-report/final-assessment-report-aloysia-citrodora-palau-syn-aloysia-triphylla-lher-kuntze-verbena-triphylla-lher-lippia-citriodora-kunth-folium_en.pdf?utm_source=chatgpt.com "Verbenae citriodorae folium - AR"
[6]: https://plants.ces.ncsu.edu/plants/aloysia-citriodora/common-name/lemon-beebrush/?utm_source=chatgpt.com "Lemon Beebrush - Aloysia citriodora | North Carolina Extension Gardener Plant Toolbox"
[7]: https://pubmed.ncbi.nlm.nih.gov/30450627/?utm_source=chatgpt.com "Aloysia citriodora Palau (lemon verbena) for insomnia patients: A randomized, double-blind, placebo-controlled clinical trial of efficacy and safety."
[8]: https://pubmed.ncbi.nlm.nih.gov/38794761/?utm_source=chatgpt.com "Dietary Supplementation with an Extract of Aloysia citrodora (Lemon verbena) Improves Sleep Quality in Healthy Subjects: A Randomized Double-Blind Controlled Study - PubMed"
[9]: https://pubmed.ncbi.nlm.nih.gov/37216059/?utm_source=chatgpt.com "Effects of the aroma of lemone verbena (Aloysia citriodora Paláu) essential oil on anxiety and the hemodynamic profile before cesarean section: A randomized clinical trial - PubMed"
Educational Use Only: The information presented on this page is provided for educational, historical, and informational purposes only. ArdNemeton na Tuatha and Bhùth Draoi do not provide medical advice. Always consult your physician and pharmacist before using any herb, mushroom, supplement, or botanical product for medicinal purposes. Traditional uses described herein do not constitute medical claims.