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African Marigold / Aztec Marigold (Tagetes erecta)
Materia Medica
Family: Asteraceae
Botanical name: Tagetes erecta L.
Common names: African Marigold, Aztec Marigold, Mexican Marigold, American Marigold, Big Marigold
Traditional names: Cempasúchil, Cempaxóchitl, Flor de Muerto
Parts used: Flowers, petals, leaves, aerial parts, roots
Growth habit: Strongly aromatic annual herb
Primary traditions: Mesoamerican traditional medicine and ceremony, Latin American folk medicine, later Asian and African regional traditions
Actions & Energetics
Traditional action themes: aromatic digestive, antispasmodic, diuretic, emmenagogue, respiratory herb, topical skin herb, analgesic, and ritual plant.
Historical Mesoamerican records describe cempasúchil in preparations for cold-associated complaints and in uses intended to promote menstruation and urination. Later ethnobotanical records document gastrointestinal, respiratory, pain, skin, and ritual uses.
Botanical Description
Tagetes erecta is an erect, strongly aromatic annual commonly 0.4–1.8 m tall. Leaves are opposite on the lower plant and may become alternate above. They are pinnately divided into narrow elliptic-to-lanceolate, serrated leaflets with visible oil glands.
Flower heads are solitary and terminal on long stalks that often thicken below the head. Wild-type heads contain golden-yellow ray florets around numerous disc florets. Cultivated forms range from yellow to deep orange and are often highly doubled into the large rounded flower heads associated with African marigolds. The fruits are narrow black achenes with a small pappus.
Name Confusion & Related Plants
African Marigold is a horticultural common name; Tagetes erecta is native to Mexico and Guatemala rather than Africa. The species is distinct from Calendula officinalis, the pot marigold used in Western herbalism, and from other Tagetes species such as Tagetes minuta and Tagetes lucida. Chemistry and traditional use differ among these plants.
Traditional Indications
Mesoamerican and later regional traditions record Tagetes erecta for stomachache, diarrhea, dysentery, respiratory infections, cough and cold, fever, tooth and ear pain, rheumatic or body pain, skin eruptions, sores, abscesses, boils, itching, and ritual or spiritual illnesses. Historical records also describe diuretic and emmenagogue use.
Preparations & Dosage
Flower Infusion — Rodrigues Island Ethnobotanical Record
A regional ethnobotanical record describes an infusion prepared from three flowers, taken at one cup per day for fever associated with infection.
Flower Extract — Indian Folk Record
An ethnobotanical record from India describes a flower extract used at two teaspoons twice daily for 8–10 days, combined with common salt and mineral ingredients, for difficulty with urination. This is a recorded regional preparation rather than a standardized modern extract.
Mesoamerican Infusions
Aerial parts are recorded in infusions for gastrointestinal pain and respiratory complaints. Preparation strength varies by local tradition, and published ethnobotanical records often describe the plant part and preparation without giving a standardized gram dose.
Marigold-Derived Lutein — Human Study Amount
A randomized crossover study in 24 healthy adults used 6 mg lutein per day from marigold-flower extract, comparing free and esterified lutein forms over two-month intervention periods. Serum lutein increased approximately 2.4-fold by day 15 and remained elevated through day 60. This amount refers to standardized lutein derived from marigold flowers, not to crude flower powder or tea.
Children & Adolescents
No standardized pediatric medicinal dose for concentrated Tagetes erecta preparations has been established. Ordinary food-level petal use is a different exposure from essential oil or concentrated extracts.
Traditional & Cultural Preparations
- Flower and aerial-part infusions
- Flower extracts and expressed preparations
- Topical macerations and washes for skin complaints
- Fresh and dried flowers for ceremonial and ritual use
- Petal material used as dye and pigment source
Classical Formulations
No single standardized classical formula system is established for Tagetes erecta. Regional infusions, washes, ritual preparations and food uses vary by culture and should be documented as those specific traditions rather than treated as one universal formula.
Constituents
The flowers are especially rich in xanthophyll carotenoids, principally lutein and lutein esters, with smaller amounts of zeaxanthin depending on cultivar. Other constituents include flavonoids such as quercetin- and patuletin-related compounds, phenolic acids, volatile terpenes, and thiophene derivatives.
Commercial pigment cultivars are selected for carotenoid yield, and specialized lines can be bred for higher zeaxanthin content.
Modern Research
Human research involving the plant itself is limited mainly to standardized marigold-derived lutein and zeaxanthin ingredients. In a randomized crossover study, 6 mg/day of lutein from marigold extract increased serum lutein rapidly, with no meaningful difference between the free and ester forms.
Most research on crude Tagetes erecta flower, leaf, and root preparations remains laboratory or animal work. Experimental studies have investigated analgesic, anti-inflammatory, antispasmodic, antimicrobial, antiparasitic, and antioxidant activity.
Adverse Effects
Human and toxicological records include contact dermatitis, skin redness, burning, and blistering after sap exposure combined with sunlight, consistent with phototoxic thiophene chemistry in Tagetes. The strong aroma can also irritate the nose or eyes in sensitive individuals.
Mexican ethnomedical toxicology records have associated flower use with gastritis. Experimental intestinal research also found that flower extract can produce contractile activity under some conditions.
Serious systemic toxicity has not been established from ordinary ornamental or culinary exposure, but concentrated medicinal preparations and essential oils are less well characterized and should not be treated as equivalent to food-level use.
Interactions & Contraindications
Clinically meaningful drug interactions have not been well characterized for Tagetes erecta. People with known sensitivity to marigolds or other Asteraceae plants should be cautious, and concentrated essential oil or extract exposure should not be treated as equivalent to eating small amounts of petals.
Pregnancy & Breastfeeding
Historical Mesoamerican use includes promoting menstruation, giving the plant a documented emmenagogue tradition. Modern human pregnancy and breastfeeding studies defining the safety of medicinal whole-flower extracts or concentrated preparations are lacking; medicinal-dose use should therefore not be assumed safe.
Habitat & Cultivation
- Native range: Mexico to Guatemala
- Habit: Warm-season annual
- Light: Full sun
- Soil: Adaptable; grows well in reasonably drained garden soil
- Climate: Warm subtropical to temperate summer conditions
- Flowering: Summer through autumn until frost in temperate gardens
Propagation
Propagation is primarily by seed. Seeds are sown after frost danger has passed or started earlier under protection. Warm soil promotes rapid germination. Cultivars grown for pigment, cut flowers, or large double heads are maintained through selected seed lines.
Harvesting & Drying
Flower heads are harvested fully open for ceremonial, culinary, dye, or carotenoid use. Petals may be separated from the green involucre when only the colored floral material is desired. Flowers are dried with good airflow away from intense light because carotenoid pigments degrade with prolonged heat, oxygen, and light exposure.
Food, Color & Agricultural Uses
Fresh or dried petals have food and seasoning traditions in several regions. Commercial marigold flowers are also a major industrial source of lutein and related xanthophyll pigments.
In the United States, the specific FDA color-additive regulation for Tagetes meal and Tagetes extract authorizes those preparations for chicken feed to enhance the yellow color of chicken skin and eggs. Separately, standardized lutein and zeaxanthin ingredients derived from selected Tagetes erecta flowers have been the subject of food-ingredient and GRAS records.
The plant is also used as an ornamental, cut flower, textile dye source, poultry-pigment crop, and in nematode-management systems.
History, Folklore & Spiritual Use
Cempasúchil has a long Mesoamerican ceremonial history. Historical scholarship links the plant with the Aztec rain god Tláloc and with medicinal and ritual use before European contact.
Today it is one of the best-known flowers associated with Día de Muertos / Day of the Dead. Bright flowers are placed on altars, graves, pathways, and offerings, and the plant is widely known as flor de muerto, the flower of the dead.
U.S. Legal & Regulatory Status
Tagetes erecta is not listed as a U.S. Federal Noxious Weed and is not federally banned as a plant. FDA separately regulates specific uses of Tagetes-derived meal, extracts, pigments, lutein, and zeaxanthin according to the identity and intended use of the finished ingredient.
Materia Medica Summary
African Marigold / Aztec Marigold (Tagetes erecta) is a Mesoamerican aromatic annual with medicinal, ceremonial, food-color, and pigment traditions. Recorded regional preparations include an infusion of three flowers at one cup per day for fever and a flower extract at two teaspoons twice daily for 8–10 days in an Indian urinary-use record. Modern human research has used 6 mg/day of standardized lutein derived from marigold flowers. The flower is rich in lutein esters and other carotenoids, while the whole plant also contains flavonoids, volatile compounds, and thiophenes. Its cultural history includes pre-Columbian medicine, association with Tláloc, and modern Día de Muertos traditions.