Citronella: Benefits, Uses & Safety

Overview & Introduction

Citronella, known scientifically as Cymbopogon nardus, is a robust, aromatic perennial grass belonging to the vast Poaceae family, which also includes many staple food grains.

The interesting part about Citronella is that the plant can be discussed from several angles at once: visible form, environmental behavior, traditional context, and modern quality control.

The aim is simple: make the article detailed enough for serious readers while keeping the structure clear enough for fast scanning and confident decision-making.

• Primary Use — Renowned natural insect repellent, especially against mosquitoes.
• Key Compound — Citronellal, responsible for its distinctive aroma and repellent action.
• Traditional System — Utilized in Ayurveda for fever/colds and TCM for digestion.
• Aroma Profile — Fresh, uplifting lemony scent.
• Plant Type — Tall, perennial aromatic grass.
• Habitat — Native to tropical and subtropical regions of Southeast Asia.
• Other Benefits — Antifungal, anti-inflammatory, and antiseptic properties.
• Safety Note — Generally safe for topical use when diluted, avoid internal consumption.

Botanical Profile & Taxonomy

Citronella should be anchored to the correct taxonomic identity before any discussion of care, use, or safety begins.

Using the accepted scientific name Cymbopogon nardus helps readers avoid confusion caused by old synonyms, loose common names, or inconsistent plant labels.

Family and order placement also matter because they explain recurring structural traits, likely relatives, and the kinds of mistakes readers often make when they rely on appearance alone.

Physical Description & Morphology

Microscopic or internal identification notes deepen the picture, especially for processed material: Both glandular and non-glandular trichomes may be observed. Non-glandular trichomes are typically unicellular and pointed, providing a protective. Paracytic stomata are predominant, meaning each stomatal complex is flanked by two subsidiary cells parallel to the guard cells. They are more. Calcium oxalate crystals are generally absent or rare in Cymbopogon nardus. However, silica bodies are common, particularly in the epidermal cells.

In overall habit, the plant is described as Tree with a mature height around Typically 0.3-2 m and spread of Clumping or spreading; typically 0.3-1.5 m.

In real-world identification, the most helpful approach is to read the plant as a whole. Habit, size, stem texture, leaf arrangement, flower form, and any distinctive surface detail all matter. For Citronella, morphology is not only a descriptive topic; it is the foundation of correct recognition.

Natural Habitat & Distribution

The native or historically recorded center of distribution for Citronella is Sri Lanka, Southeast Asia. That origin is more than background trivia; it explains how the plant responds to heat, moisture, shade, and seasonal change.

The plant is associated with the following countries or range markers: Angola, Assam, Bangladesh, Botswana, Burundi, Cambodia, Cape Provinces, DR Congo, East Himalaya, Eswatini, Free State, India.

Environmental notes in the live record add more context: Cymbopogon nardus prefers a tropical or subtropical climate, thriving in temperatures ranging from 20°C to 30°C (68°F to 86°F). Ideal humidity levels are above 60%, which align with its natural habitat. This grass favors well-drained, sandy to loamy soils with a pH between 6 and 7.5. While citronella can adapt to partial shade, it performs best under full.

In cultivation terms, the main ecological clues are: Full sun; Low to moderate; Well-drained to seasonally moist; Species-dependent; often broad tolerance; Perennial; Tree.

Physiology data reinforce the habitat story: Exhibits typical cellular respiration, with rates influenced by temperature and metabolic activity. Its robust growth in warm climates suggests. High net photosynthesis rates under high light and temperature. Stomatal conductance is regulated to balance CO2 uptake with water loss, with. Responds positively to appropriate levels of plant growth hormones. Auxins are crucial for root development, gibberellins for stem elongation, and.

Traditional & Cultural Significance

Citronella, *Cymbopogon nardus*, a fragrant perennial grass native to Sri Lanka and Southeast Asia, holds a rich tapestry of cultural significance woven through its history, economy, and traditional practices. While specific historical medicinal applications for *Cymbopogon nardus* are less documented than for some other aromatic plants, its genus, *Cymbopogon*, has deep roots in traditional healing systems. In.

Ethnobotanical records also show how this plant has been framed across different places: Ache(Head) in Egypt (Tackholm, Vivi and Gunnar. 1973 (reprint). Flora of Egypt. Vol. 1-4. Originally published in Foriad I Univ. Bulletin of the Faculty of Science, vol. 17, Cairo, 1941.); Anodyne in Mexico (Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.); Carminative in Turkey (Steinmetz, E.F. 1957. codex Vegetabilis. Published by the author, Amsterdam.); Carminative in Mexico (Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.); Dentifrice in Elsewhere (Duke, 1992 *); Diaphoretic in Mexico (Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.); Disinfectant in Elsewhere (Uphof, J.C. Th. 1968. Dictionary of economic plants. 2nd ed. Verlag von J. Cramer.); Dyspepsia in Java (Duke, 1992 *).

Local names help show how different communities notice and classify the plant: citronela-de-Java, citronellagräs, citronnelle de Ceylan, dichtblättriges Zitronellagras, zacate limón, Citronellgras, capim-de-cheiro, capim-santo, reuse terpentyngras, Ceyloncitronell.

Traditional context matters, but it should always be separated from modern certainty. Historical use can guide questions, yet it does not automatically prove present-day clinical effectiveness.

Medicinal Properties & Health Benefits

The main benefit themes associated with the plant include: Natural Insect Repellent — Citronella is highly effective as a natural insect repellent, primarily due to its high concentration of citronellal, geraniol, and. Antifungal Properties — The essential oil of Cymbopogon nardus exhibits significant antifungal activity against various dermatophytes and other pathogenic. Anti-inflammatory Effects — Research indicates that citronella oil possesses anti-inflammatory compounds that can help reduce swelling and pain. When applied. Antiseptic Qualities — Citronella essential oil has potent antiseptic properties, making it useful for cleaning minor wounds, cuts, and abrasions. It helps to. Antibacterial Activity — Studies have shown that Cymbopogon nardus oil can inhibit the growth of various bacteria, including some common skin pathogens. This. Digestive Aid — In Traditional Chinese Medicine (TCM), citronella is recognized for its warming properties and is traditionally used to support digestive. Fever Reducer (Antipyretic) — Traditional Ayurvedic medicine utilizes citronella to help manage fevers and cold symptoms. Its diaphoretic properties may. Cold and Flu Relief — As part of traditional remedies in Southeast Asia, the vapor from citronella preparations is inhaled to relieve congestion, sore throat.

The evidence matrix gives a more careful picture of those claims: Insecticidal/Repellent Activity. In vivo (field trials), In vitro. Strong. Numerous studies confirm effectiveness against mosquitoes (Aedes aegypti, Anopheles spp.) and other insects. Efficacy comparable to DEET when formulated with fixatives to prolong activity. Antifungal Activity. In vitro, In vivo (animal). Moderate. Demonstrated inhibitory effects against various dermatophytes and Candida species in laboratory settings, with some animal model support for skin infections. Anti-inflammatory Effects. In vitro, In vivo (animal). Preliminary. Studies suggest inhibition of inflammatory mediators. More research is needed to confirm efficacy in human clinical trials for muscle pain or arthritis. Antibacterial Activity. In vitro. Preliminary. Inhibition of several bacterial strains (e.g., Staphylococcus aureus, Escherichia coli) observed in laboratory studies. Clinical relevance requires further investigation. Anxiolytic/Relaxant Properties. In vivo (animal), Anecdotal. Preliminary. Aromatic inhalation has shown calming effects in animal models and is widely used anecdotally for stress reduction. Human clinical trials are limited.

The stored evidence confidence for this profile is traditional. That should shape how strongly any benefit statement is interpreted.

For medicinal content, the key discipline is to distinguish traditional use, mechanism-based plausibility, and human clinical support. Those are related ideas, but they are not the same thing.

• Natural Insect Repellent — Citronella is highly effective as a natural insect repellent, primarily due to its high concentration of citronellal, geraniol, and.
• Antifungal Properties — The essential oil of Cymbopogon nardus exhibits significant antifungal activity against various dermatophytes and other pathogenic.
• Anti-inflammatory Effects — Research indicates that citronella oil possesses anti-inflammatory compounds that can help reduce swelling and pain. When applied.
• Antiseptic Qualities — Citronella essential oil has potent antiseptic properties, making it useful for cleaning minor wounds, cuts, and abrasions. It helps to.
• Antibacterial Activity — Studies have shown that Cymbopogon nardus oil can inhibit the growth of various bacteria, including some common skin pathogens. This.
• Digestive Aid — In Traditional Chinese Medicine (TCM), citronella is recognized for its warming properties and is traditionally used to support digestive.
• Fever Reducer (Antipyretic) — Traditional Ayurvedic medicine utilizes citronella to help manage fevers and cold symptoms. Its diaphoretic properties may.
• Cold and Flu Relief — As part of traditional remedies in Southeast Asia, the vapor from citronella preparations is inhaled to relieve congestion, sore throat.
• Headache Alleviation — Unani medicine employs citronella for its potential to soothe headaches, particularly tension headaches. The calming aroma and.
• Stress Reduction and Relaxation — The pleasant, uplifting aroma of citronella essential oil has mild sedative and anxiolytic effects. It is often used in.

Chemical Constituents & Phytochemistry

The broader constituent profile includes Monoterpene Aldehydes — Citronellal (C10H18O) is the primary active compound, responsible for the characteristic. Monoterpene Alcohols — Citronellol (C10H20O) and Geraniol (C10H18O) are significant components that contribute to the. Other Monoterpenes — Camphene (C10H16), Linalool (C10H18O), Limonene (C10H16), and Pinene (C10H16) are present. Sesquiterpenes — While present in smaller quantities, compounds like Caryophyllene (C15H24) contribute to the. Esters — Geranyl acetate (C12H20O2) is an ester derived from geraniol, contributing a rosy, fruity note to the aroma. Phenolic Compounds — Although less prominent than in other Cymbopogon species, some phenolic acids may be present. Flavonoids — Traces of flavonoids may be found, contributing to the plant's general antioxidant and anti-inflammatory. Alkanes — Long-chain hydrocarbons are present in the waxy cuticle of the plant, though not typically considered active. Fatty Acids — Minor amounts of fatty acids can be found in the plant tissues, playing a role in cell structure. Terpenoids — A broad category encompassing many of the above, including monoterpenes and sesquiterpenes, which are the.

The detailed phytochemistry file adds these markers: Citronellal, Monoterpene aldehyde, Leaf, Stem, 30-50% w/w; Geraniol, Monoterpene alcohol, Leaf, Stem, 10-25% w/w; Citronellol, Monoterpene alcohol, Leaf, Stem, 5-15% w/w; Camphene, Monoterpene, Leaf, Stem, 0.5-2% w/w; Limonene, Monoterpene, Leaf, Stem, 0.5-2% w/w; Geranyl acetate, Monoterpene ester, Leaf, Stem, 1-5% w/w; Caryophyllene, Sesquiterpene, Leaf, Stem, 0.1-1% w/w.

Local chemistry records also support the profile: MENTHOL in Plant (not available-not available ppm); CAMPHOR in Plant (15.0-60.0 ppm); GERANIOL in Plant (600.0-4794.0 ppm); CARYOPHYLLENE in Plant (96.0-384.0 ppm); ALPHA-PINENE in Plant (78.0-312.0 ppm); ETHANOL in Plant (75.0-300.0 ppm); ALPHA-TERPINEOL in Plant (not available-not available ppm); TERPINEN-4-OL in Plant (21.0-84.0 ppm).

Compound profiles also shift with plant part, age, season, processing, and storage. The chemistry of a fresh leaf, dried root, or concentrated extract should never be treated as automatically identical.

How to Use — Preparations & Dosage

Recorded preparation and use methods include Essential Oil Extraction — The most common method involves steam distillation of the fresh or partially dried leaves and stems of Cymbopogon nardus. This yields the concentrated. Topical Application (Diluted Oil) — For insect repellent or anti-inflammatory purposes, dilute citronella essential oil with a carrier oil (e.g., coconut, jojoba, almond oil) at. Aromatic Diffusion — To repel insects indoors, purify air, or promote relaxation, add a few drops of citronella essential oil to an ultrasonic diffuser. This disperses the. Herbal Infusion/Tea — For traditional digestive support or relief from cold symptoms, steep 1-2 teaspoons of dried citronella leaves in a cup of hot water for 5-10 minutes. Compresses — For localized muscle pain or swelling, soak a clean cloth in a warm water solution containing a few drops of diluted citronella essential oil. Apply the compress to. Bath Additive — For a relaxing and muscle-soothing bath, add 5-10 drops of citronella essential oil, pre-mixed with a dispersant like Epsom salts or a carrier oil, to warm. Insect Repellent Sprays — Create a natural insect repellent spray by mixing diluted citronella essential oil with water and a small amount of witch hazel or vodka in a spray. Potpourri and Sachets — Dried citronella leaves can be incorporated into potpourri or placed in sachets to naturally freshen rooms, drawers, or closets, imparting a fresh, lemony.

The plant part most closely linked to use is recorded as Seeds, roots, rhizomes, or aerial parts cited in related taxa.

Edibility and processing notes matter here as well: Varies; some species have edible grains or shoots.

Preparation defines the outcome. Tea, decoction, tincture, powder, fresh plant material, cooked food use, and concentrated extract cannot be discussed as if they were interchangeable.

1. Identify the exact species and plant part first.
2. Match the preparation to the intended use.
3. Check safety, interactions, and processing details before routine use or large-scale handling.

Safety Profile, Side Effects & Contraindications

The first safety note is direct: Usually low, but verify species-specific risks

Specific warnings recorded for this plant include Drug Interactions — There is limited data on significant drug interactions with Cymbopogon nardus. However, individuals on sedatives or anticoagulant. Pregnancy and Breastfeeding Warning — Pregnant and breastfeeding women should avoid the internal use of citronella essential oil due to insufficient safety. Children and Infants — Citronella essential oil should be used with extreme caution on children and infants, if at all. Dilution ratios must be significantly. Internal Use Advisory — Citronella essential oil is NOT recommended for internal consumption unless under the direct supervision and guidance of a qualified. Topical Application Precaution — Always perform a patch test on a small area of skin before widespread topical application to check for sensitivity or. Asthma and Respiratory Conditions — Individuals with asthma or other respiratory conditions should use citronella essential oil diffusers with caution, as. Storage — Store citronella essential oil in a cool, dark place in a tightly sealed, dark glass bottle to prevent oxidation and degradation, which can alter. Quality Assurance — Ensure that any citronella product used is 100% pure, therapeutic-grade essential oil, free from synthetic additives or adulterants. Skin Irritation — Direct application of undiluted citronella essential oil can cause skin irritation, redness, itching, or contact dermatitis, especially in. Allergic Reactions — Some individuals may experience allergic reactions, including hives, rash, or swelling, particularly if they have pre-existing.

Quality-control notes add another warning: Common adulterants include synthetic citronellal, geraniol, or citronellol, as well as cheaper essential oils like eucalyptus or turpentine oil. Adulteration can also occur with.

No plant should be described as universally safe. Identity, dose, plant part, preparation style, age, pregnancy status, medication use, allergies, and contamination risk all change the answer.

Growing & Cultivation Guide

The cultivation record emphasizes these practical steps: Soil Requirements — Cymbopogon nardus thrives in well-drained, fertile soils ranging from loamy to sandy textures. An ideal pH range is slightly acidic to neutral. Soil Preparation — Before planting, enrich the soil with generous amounts of organic matter, such as well-rotted compost or farmyard manure. This improves soil. Planting Method — Citronella can be propagated via seeds, but more commonly through rooted slips or divisions of mature clumps. Plant slips in rows spaced approximately. Watering Regime — Regular and consistent watering is essential, especially during dry periods or in regions with low rainfall. The soil should be kept consistently. Sunlight Exposure — This tropical grass requires full sun exposure to thrive, ideally receiving at least 6-8 hours of direct sunlight daily. Ample sunlight promotes. Fertilization — Apply a balanced NPK (Nitrogen-Phosphorus-Potassium) fertilizer every 4-6 weeks during the active growing season to support robust growth. Organic. Temperature and Humidity — Citronella prefers warm, tropical climates with high humidity. It is not frost-tolerant and will suffer damage or die back in temperatures. Pest and Disease Management — Cymbopogon nardus is generally robust and less susceptible to pests due to its natural repellent properties. However, monitor for common.

The broader growth environment is described like this: Cymbopogon nardus prefers a tropical or subtropical climate, thriving in temperatures ranging from 20°C to 30°C (68°F to 86°F). Ideal humidity levels are above 60%, which align with its natural habitat. This grass favors well-drained, sandy to loamy soils with a pH between 6 and 7.5. While citronella can adapt to partial shade, it performs best under full.

Planning becomes easier when these traits are kept in view: Tree; Typically 0.3-2 m; Clumping or spreading; typically 0.3-1.5 m.

In practice, healthy cultivation comes from systems thinking rather than one-off tricks. Site choice, drainage, timing, spacing, pruning, feeding, and observation all reinforce one another.

Light, Water & Soil Requirements

The most useful care snapshot is this: Light: Full sun; Water: Low to moderate; Soil: Well-drained to seasonally moist; USDA zone: Species-dependent; often broad tolerance.

Outdoors, light, water, and soil must be read together. The same watering schedule can be too much in dense clay and too little in a porous sandy bed.

Light, water, and soil should never be treated as separate checkboxes. A plant in stronger light often dries faster, soil texture changes how quickly water moves, and temperature plus humidity influence how stress appears in leaves and roots.

For Citronella, the safest care approach is to treat Full sun, Low to moderate, and Well-drained to seasonally moist as linked decisions rather than isolated tips. If one condition shifts, the other two usually need to be reconsidered as well.

Microclimate matters too. Indoors, room placement and airflow can matter as much as window exposure. Outdoors, reflected heat, slope, mulch, and nearby plants can change how the temperature rhythm described for the species and humidity that matches the plant type are actually experienced at plant level.

Propagation Methods

Documented propagation routes include Cymbopogon nardus can be propagated by seeds or vegetative methods. **Propagation by Seeds**: 1. Collect seeds from mature plants; they should be stored in a cool, dry area. 2. Sow seeds in seed trays filled with seed-starting mix during the spring. 3. Maintain moisture and keep trays in. separate rhizomes with healthy roots and replant immediately.

Propagation works best when the parent stock is healthy, correctly identified, and handled in the right season. That sounds obvious, but it is exactly where many failures begin.

• Cymbopogon nardus can be propagated by seeds or vegetative methods. **Propagation by Seeds**: 1. Collect seeds from mature plants
• They should be stored in a cool, dry area. 2. Sow seeds in seed trays filled with seed-starting mix during the spring. 3. Maintain moisture and keep trays in.
• Separate rhizomes with healthy roots and replant immediately.

Propagation works best when the reader matches method to biology. Some plants respond readily to cuttings, some to division, some to seed, and others require more patience or more exact seasonal timing.

Pest & Disease Management

For medicinal species, pest pressure is not only a horticultural issue. It also affects harvest cleanliness, storage stability, and confidence in the final material.

The smartest response sequence is observation first, environmental correction second, and treatment only after the real pattern is clear.

Pest and disease management is strongest when it begins before visible damage becomes severe. Routine observation, clean handling, sensible spacing, air movement, and balanced watering reduce many problems before treatment is even needed.

When symptoms do appear on Citronella, the most reliable response is diagnostic rather than reactive. Yellowing, spots, wilt, chewing, and stunting can all have multiple causes, so a rushed treatment can waste time or worsen the problem.

Good troubleshooting also includes environmental correction. Pests and disease often reveal a deeper issue such as root stress, poor airflow, inconsistent watering, weak light, or exhausted soil structure.

Harvesting, Storage & Processing

The plant part most often associated with harvest or processing is Seeds, roots, rhizomes, or aerial parts cited in related taxa.

Storage guidance from the quality-control record reads as follows: Citronella essential oil is sensitive to light, heat, and air, which can cause oxidation and degradation of its active compounds, particularly citronellal. Proper storage in.

For medicinal plants, harvesting cannot be separated from processing. The right plant part, the right timing, and the right drying conditions all shape quality and safety.

Whatever the purpose, the rule is the same: harvest clean material, label it clearly, and store it in a way that preserves identity and condition.

Harvest and storage determine whether a plant's quality is preserved after it leaves the bed, pot, field, or wild source. Clean timing, correct plant part selection, and careful drying or handling all matter more than many readers expect.

Companion Planting & Garden Design

In a home herb garden or medicinal bed, Citronella should be placed where harvesting is easy, labeling remains clear, and neighboring plants do not create confusion at collection time.

Companion planting and design are not only aesthetic decisions. They affect airflow, root competition, moisture sharing, harvest access, visibility, and the general logic of the planting scheme.

With Citronella, good placement means thinking about mature size, maintenance rhythm, and how neighboring plants change the feel and function of the space. A plant can be healthy on its own and still be poorly placed within the broader composition.

Scientific Research & Evidence Base

The evidence matrix points to several recurring themes: Insecticidal/Repellent Activity. In vivo (field trials), In vitro. Strong. Numerous studies confirm effectiveness against mosquitoes (Aedes aegypti, Anopheles spp.) and other insects. Efficacy comparable to DEET when formulated with fixatives to prolong activity. Antifungal Activity. In vitro, In vivo (animal). Moderate. Demonstrated inhibitory effects against various dermatophytes and Candida species in laboratory settings, with some animal model support for skin infections. Anti-inflammatory Effects. In vitro, In vivo (animal). Preliminary. Studies suggest inhibition of inflammatory mediators. More research is needed to confirm efficacy in human clinical trials for muscle pain or arthritis. Antibacterial Activity. In vitro. Preliminary. Inhibition of several bacterial strains (e.g., Staphylococcus aureus, Escherichia coli) observed in laboratory studies. Clinical relevance requires further investigation. Anxiolytic/Relaxant Properties. In vivo (animal), Anecdotal. Preliminary. Aromatic inhalation has shown calming effects in animal models and is widely used anecdotally for stress reduction. Human clinical trials are limited.

Ethnobotanical activity records add historical reference trails: Ache(Head) — Egypt [Tackholm, Vivi and Gunnar. 1973 (reprint). Flora of Egypt. Vol. 1-4. Originally published in Foriad I Univ. Bulletin of the Faculty of Science, vol. 17, Cairo, 1941.]; Anodyne — Mexico [Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.]; Carminative — Turkey [Steinmetz, E.F. 1957. codex Vegetabilis. Published by the author, Amsterdam.]; Carminative — Mexico [Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.]; Dentifrice — Elsewhere [Duke, 1992 *]; Diaphoretic — Mexico [Martinez, Maximino. 1969. Las Plantas Medinales de Mexico.].

The compiled source count behind the live profile is 7. That does not guarantee certainty, but it does suggest the record has been cross-checked beyond a single note.

Analytical testing notes also strengthen the evidence base: Gas Chromatography-Mass Spectrometry (GC-MS) is the gold standard for quantitative and qualitative analysis of essential oil constituents. High-Performance Liquid Chromatography.

A careful evidence section should say what is known, what is plausible, and what remains uncertain. Readers are better served by clear limits than by exaggerated confidence.

Buying Guide & Expert Tips

Quality markers worth checking include Citronellal (minimum 30-40%), Geraniol (minimum 10-20%), and Citronellol (minimum 5-15%) are the primary marker compounds for the standardization and quality assessment of.

Adulteration and substitution risk should not be ignored: Common adulterants include synthetic citronellal, geraniol, or citronellol, as well as cheaper essential oils like eucalyptus or turpentine oil. Adulteration can also occur with.

When buying Citronella, start with verified botanical identity. The label, scientific name, and the source page should agree before you judge price, size, or claimed benefits.

Frequently Asked Questions

What is Citronella best known for?

Citronella, known scientifically as Cymbopogon nardus, is a robust, aromatic perennial grass belonging to the vast Poaceae family, which also includes many staple food grains.

Is Citronella beginner-friendly?

That depends on the growing environment and the intended use. Some plants are easy to grow but not simple to use medicinally, while others are the opposite.

How much light does Citronella need?

Full sun

How often should Citronella be watered?

Low to moderate

Can Citronella be propagated at home?

Yes, but the best method depends on whether the species responds best to seed, cuttings, division, offsets, or other propagation routes.

Does Citronella have safety concerns?

Usually low, but verify species-specific risks

What is the biggest mistake people make with Citronella?

The most common mistake is applying generic advice instead of matching the plant to its real environment, identity, and limits.

Where can I verify more information about Citronella?

Start with the Flora Medical Global plant profile: https://www.floramedicalglobal.com/plant/cymbopogon-nardus-citronella-repellent

Why do sources sometimes disagree about Citronella?

Different references may use different synonyms, plant parts, cultivation conditions, or evidence standards. That is why taxonomy and source quality both matter.