In Guyana, Lantana camara is a familiar plant. It can be found growing along roadsides, around yards, near fences, in open land and in bushy areas. Its clusters of small yellow, orange, pink, red or mixed-coloured flowers make it easy to notice, yet many people may not realize that this common plant has a long history of traditional medicinal use.

Lantana camara is also one of the plants featured in my book The Plant Next Door, which looks at familiar plants growing around us and the traditional knowledge connected to them.

Across different cultures, lantana has been used in traditional medicine for skin complaints, wounds, fever, coughs, stomach problems, swelling, rheumatic pain and other conditions. Modern scientific research has also found that the plant contains numerous active compounds, including triterpenes, flavonoids, phenolic compounds and iridoid glycosides. These compounds have been studied for antibacterial, antifungal, anti-inflammatory, antioxidant, wound-healing and other biological activities. (PubMed Central (PMC))

Traditional Uses of Lantana Camara

Traditional use of lantana varies from country to country, but the leaves have been among the most commonly used parts of the plant.

Ethnobotanical records describe preparations of lantana for complaints such as itching, cuts, ulcers, swelling, coughs, bronchitis, asthma, eczema, chicken pox, stomachache, toothache, headache, rheumatism, scabies and wounds. In some communities, leaf decoctions and infusions have also been used traditionally for diarrhoea, fever and other ailments. (PubMed Central (PMC))

These traditional uses have encouraged scientists to study the plant more closely.

Anti-Inflammatory Benefits

One of the important areas of research surrounding Lantana camara is inflammation.

Laboratory and animal studies have reported anti-inflammatory activity from lantana leaf extracts. An aqueous leaf extract has also demonstrated analgesic, or pain-relieving, effects in experimental research. (PubMed Central (PMC))

This is especially interesting because traditional medicine has long used lantana in preparations associated with swelling, rheumatic discomfort and pain.

Inflammation is part of the body's natural response to injury and infection, but excessive or prolonged inflammation contributes to many health problems. The anti-inflammatory compounds found in lantana are therefore an important area of medicinal-plant research.

Antibacterial Activity

Lantana has demonstrated antibacterial activity against several types of bacteria in laboratory studies.

Researchers have reported activity from leaf extracts against organisms including Escherichia coli, Proteus vulgaris, Vibrio cholerae, Bacillus subtilis, Klebsiella pneumoniae, Staphylococcus aureus and Pseudomonas aeruginosa. (PubMed Central (PMC))

This antibacterial activity may help explain why lantana has traditionally been used as an antiseptic and in preparations for wounds and certain skin complaints.

Antifungal Activity

Lantana has also been studied for antifungal properties.

Extracts and essential oils from the plant have demonstrated activity against certain fungi in experimental research. (PubMed Central (PMC))

This has contributed to scientific interest in lantana for skin and topical applications, particularly because fungal organisms can contribute to several common skin and scalp conditions.

Wound-Healing Activity

One of the more interesting medicinal areas associated with lantana is wound care.

Traditional healers in different regions have used lantana leaves on cuts, ulcers and wounds. Modern research has also reported wound-healing activity from both ethanol and water extracts of lantana leaves in experimental studies. (PubMed Central (PMC))

Wound healing involves several processes, including inflammation control, protection against microorganisms and rebuilding damaged tissue. Because lantana has demonstrated both antimicrobial and anti-inflammatory activity, researchers continue to investigate its possible role in this area.

Antioxidant Properties

Lantana leaves and flowers contain natural compounds with antioxidant activity.

Laboratory studies using methanol extracts from the leaves and flowers have demonstrated significant antioxidant properties. (PubMed Central (PMC))

Antioxidants help neutralize unstable molecules known as free radicals. Excessive oxidative stress can damage cells and tissues, which is why antioxidant-rich plants continue to receive significant scientific attention.

Blood Sugar Research

Lantana has also been investigated for its possible effects on blood glucose.

Experimental studies involving aqueous leaf extracts have reported antidiabetic or blood-glucose-lowering activity. (PubMed Central (PMC))

This area remains an active field of research. The findings are important because they show that compounds within the plant can affect processes involved in glucose metabolism.

They do not, however, establish lantana as a replacement for prescribed diabetes treatment.

Digestive Uses and Diarrhoea

Traditional preparations of lantana leaves have been used for digestive complaints, including diarrhoea and stomachache.

Experimental studies have also reported moderate antidiarrhoeal activity from ethanol leaf extracts. (PubMed Central (PMC))

This provides another example of a traditional use that has attracted scientific investigation.

Respiratory Uses

Lantana has a history of traditional use for respiratory complaints.

Ethnobotanical records document its use for coughs, catarrh, asthma and bronchitis in different parts of the world. (PubMed Central (PMC))

Some traditional preparations have involved the leaves, while others have used different plant parts depending on local practice.

Although these historical uses are well documented, much of the modern research into lantana's respiratory applications remains experimental rather than based on large human clinical trials.

Fever and Traditional Remedies

Lantana has also been traditionally associated with fever.

Different cultures have used leaf preparations for febrile illnesses and malaria-related traditional treatments. Researchers have subsequently investigated lantana extracts against Plasmodium falciparum, the parasite responsible for malaria, and some extracts have demonstrated notable laboratory activity, including activity against both chloroquine-sensitive and chloroquine-resistant strains. (PubMed Central (PMC))

These findings are scientifically significant and have encouraged calls for further investigation.

Antiparasitic Research

Lantana is also being studied for activity against parasites.

Researchers have reported activity against organisms associated with leishmaniasis, malaria and certain parasitic worms and nematodes. (PubMed Central (PMC))

Some of these findings have been strong enough for researchers to identify lantana's antiparasitic compounds as an area deserving further investigation.

Insect-Repellent and Insecticidal Activity

Lantana has a long history of use in plant-based pest control.

Modern studies have found that different lantana extracts can have insecticidal and larvicidal activity against mosquitoes, termites, moths, weevils and other insects. Its essential oil has also demonstrated mosquito-repellent effects. (PubMed Central (PMC))

These properties are particularly interesting in tropical regions, where mosquitoes and other insects are a constant part of daily life.

Possible Protective Effects on the Liver

Some experimental research has reported hepatoprotective activity from methanol extracts of lantana leaves. (PubMed Central (PMC))

This does not mean that eating the plant protects the liver. Lantana also contains compounds capable of causing liver toxicity, particularly in animals, making dosage, preparation and plant chemistry extremely important.

The same plant can contain compounds showing different effects under different experimental conditions.

Cancer Research

Lantana has attracted interest in cancer research because certain extracts and isolated compounds have demonstrated cytotoxic and antiproliferative activity in laboratory studies.

A recent scientific review reports anticancer and antiproliferative activity among the biological effects associated with lantana constituents. (PubMed Central (PMC))

This research is investigating compounds within the plant as possible starting points for future medicines. It should not be interpreted to mean that lantana itself is a proven cancer treatment.

Hair and Scalp Uses

The antimicrobial, antifungal, antioxidant and anti-inflammatory activity associated with lantana also makes the plant interesting for scalp and hair-care research.

Traditional topical use of lantana has centred more strongly on skin, wounds and infections than on scientifically established hair growth. However, its activity against microorganisms and inflammation may explain why leaves have sometimes been incorporated into traditional cleansing and topical preparations.

For scalp care, the condition causing itching, scaling or irritation still needs to be understood. A plant preparation cannot treat every scalp condition simply because it has antimicrobial properties.

Skin Benefits

The skin is one of the areas where lantana's traditional reputation and scientific research overlap most clearly.

Traditional uses have included:

• wounds and cuts;

• itching;

• ulcers;

• eczema;

• swelling;

• scabies; and

• other skin complaints.

Modern research has documented antibacterial, antifungal, anti-inflammatory and wound-healing activity from different lantana extracts. (PubMed Central (PMC))

These properties are among the strongest reasons lantana continues to attract interest as a medicinal plant.

Active Compounds in Lantana

The medicinal activity of lantana comes from its complex chemistry.

Researchers have identified numerous classes of natural compounds, including:

• triterpenes;

• flavonoids;

• phenylpropanoids;

• iridoid glycosides;

• steroids;

• saponins;

• polyphenols;

• coumarins;

• alkaloids; and

• other phenolic compounds. (PubMed Central (PMC))

Different compounds may contribute to different biological effects.

This is one reason scientists often study individual extracts and isolated compounds rather than treating the entire plant as though every part has exactly the same properties.

An Important Safety Side of Lantana

Lantana is medicinally interesting, but it is also a plant that must be treated with respect.

Its toxicity is particularly well documented in grazing animals. Certain compounds known as lantadenes, especially lantadene A and B, can damage the liver. Poisoning in livestock has been associated with jaundice, photosensitivity and serious liver injury. (PubMed)

Unripe green fruits have also been reported as toxic to humans. (PubMed)

For this reason, lantana should not be treated as an ordinary edible herb simply because it has medicinal uses.

Traditional medicinal knowledge includes not only knowing which plant is used, but also understanding the plant part, preparation and method of use.

Traditional Knowledge and Modern Research

Lantana camara shows why traditional plant knowledge remains important.

Long before laboratories identified triterpenes, flavonoids and other compounds within lantana, people were already using the plant in traditional preparations for wounds, swelling, fever, respiratory complaints, digestive problems and skin conditions.

Today, researchers have demonstrated antibacterial, antifungal, anti-inflammatory, antioxidant, wound-healing, antiparasitic and other biological activities within the plant. (PubMed Central (PMC))

Research continues to deepen our understanding of a plant that people have known for generations.

The Plant Next Door

Lantana camara is one of the plants featured in The Plant Next Door because it represents exactly what the book is about: recognizing the knowledge and potential contained in plants growing all around us.

A colourful shrub beside a road or fence may carry generations of traditional knowledge and contain compounds that scientists are still investigating today.

That does not make every traditional plant a cure for every illness.

It does remind us why the plants growing around us deserve to be identified, studied and remembered.

The Healthy Choice

Lantana camara is far more than an attractive flowering shrub.

Its traditional uses include preparations for wounds, skin complaints, swelling, digestive problems, fever, respiratory complaints and pain. Modern scientific studies have found antibacterial, antifungal, anti-inflammatory, antioxidant, wound-healing, antiparasitic and other biological activities within extracts and compounds from the plant.

At the same time, its known toxicity means it should be treated with knowledge and care.

Lantana gives us something valuable: an opportunity to see how traditional plant knowledge and modern scientific investigation can meet around a plant that has been growing beside us all along.

Nature gives us the plant. Tradition carries the knowledge. Research helps us understand its medicinal possibilities.

Let’s Talk Naturally with Amanda — exploring traditional remedies, natural living and the knowledge behind the plants we use every day.