Greater Celandine

Chelidonium majus is native to Europe, western Asia, and parts of North Africa, with a broad distribution extending from the British Isles and Scandinavia to the Mediterranean, the Caucasus, and western Siberia.

• Introduced to North America in the colonial era as a medicinal herb and has since naturalized widely
• Now found across much of the eastern and central United States, southeastern Canada, and parts of the Pacific Northwest
• Thrives in disturbed habitats, roadsides, hedgerows, walls, and waste ground
• Prefers temperate climates with moderate rainfall

The genus name Chelidonium derives from the Greek "chelidon" (χελιδών), meaning "swallow," based on the ancient belief that the plant bloomed when swallows arrived in spring and withered when they departed in autumn. Pliny the Elder wrote that swallows used the juice of this plant to restore sight to their chicks — a folk belief that persisted for centuries and gave rise to the plant's reputation as an eye medicine.

Greater Celandine is a somewhat sprawling, brittle-stemmed perennial herb growing 30 to 90 cm tall, occasionally reaching 120 cm in favorable conditions.

Roots & Latex:
• Taproot is thick, fleshy, and branched, producing a distinctive bright orange-yellow to orange-red latex when cut
• Latex has a pungent, acrid odor and intensely bitter taste
• Contains a complex mixture of benzylisoquinoline alkaloids

Stems:
• Erect to semi-erect, branching, somewhat brittle
• Covered with sparse, spreading hairs (pubescent)
• Hollow and somewhat succulent
• Exude the characteristic orange-yellow latex when broken

Leaves:
• Alternate, pinnately compound (pinnate), 15–30 cm long
• 5–7 ovate to oblong leaflets with deeply crenate (scalloped) or lobed margins
• Glaucous (bluish-green) on the upper surface, paler and sometimes slightly glaucous beneath
• Lower leaves long-petiolate, upper leaves becoming progressively less divided and sessile

Flowers:
• Borne in small umbel-like clusters (umbelliform cymes) at stem tips
• Each flower 4-petaled, bright yellow, approximately 1.5–2.5 cm in diameter
• Sepals: 2, caducous (falling off early)
• Stamens: numerous, yellow
• Pistil: single, superior ovary
• Blooms from May through October in temperate regions

Fruit & Seeds:
• Slender, linear capsule (silique-like), 3–5 cm long, opening from the base upward via two valves
• Contains numerous small, oval, black seeds (~1–1.5 mm) with a white elaiosome (lipid-rich appendage)
• Elaiosome attracts ants, facilitating seed dispersal (myrmecochory)
• A single plant can produce hundreds of seeds per season

Greater Celandine is a characteristic species of disturbed and ruderal habitats, commonly found at the margins of human activity.

Habitat:
• Roadsides, hedgerows, field margins, and woodland edges
• Stone walls, fences, and building foundations
• Waste ground, abandoned gardens, and urban lots
• Prefers nitrogen-rich, moderately moist, well-drained soils
• Tolerates partial shade but flowers most prolifically in full sun to light shade
• Found from lowlands to montane elevations up to approximately 1,500 m

Pollination & Seed Dispersal:
• Flowers are pollinated by a variety of generalist insects, including flies, bees, and beetles
• Nectar and pollen attract diverse pollinator communities
• Seeds dispersed primarily by ants (myrmecochory) due to the elaiosome
• Gravity and water also contribute to local seed dispersal

Ecological Role:
• Early successional species — colonizes bare or disturbed ground
• Provides nectar resources for pollinators during a long flowering period (May–October)
• Not a significant food source for most herbivores due to its toxic alkaloid content
• Larval host plant for some Lepidoptera species in its native range

All parts of Chelidonium majus are toxic, particularly the orange-yellow latex, which contains a complex mixture of benzylisoquinoline alkaloids.

Key Toxic Compounds:
• Chelerythrine — a potent protein kinase C inhibitor with cytotoxic properties
• Sanguinarine — a benzophenanthridine alkaloid with strong antimicrobial and anti-inflammatory activity but also significant toxicity
• Chelidonine — the primary alkaloid, a spasmolytic and mild analgesic
• Berberine — also present in smaller amounts
• Coptisine, protopine, and allocryptopine

Total alkaloid content in the latex can reach 0.5–4% of dry weight, with chelidonine typically being the most abundant.

Symptoms of Poisoning:
• Skin contact with the latex can cause dermatitis, blistering, and local irritation
• Ingestion leads to nausea, vomiting, abdominal pain, and diarrhea
• In severe cases: respiratory depression, CNS excitation followed by depression, and potentially fatal respiratory failure
• Sanguinarine is particularly dangerous — it can cause glaucoma-like symptoms and optic nerve damage
• Hepatotoxicity (liver damage) has been reported with prolonged or excessive internal use

Historical & Modern Warnings:
• The European Medicines Agency (EMA) has issued warnings about the hepatotoxicity of Greater Celandine preparations
• Internal use is now prohibited or strictly regulated in several European countries
• The plant should be handled with gloves when gardening or foraging
• Never ingest any part of the plant without professional medical supervision
• Despite centuries of folk use, internal consumption carries significant risk

Greater Celandine is rarely deliberately cultivated in ornamental gardens due to its invasive tendencies and toxicity, but it readily self-seeds in suitable conditions and is sometimes grown in medicinal herb gardens.

Light:
• Full sun to partial shade; flowers most prolifically in sunny locations
• Tolerates up to 50% shade but becomes leggier and produces fewer blooms

Soil:
• Adaptable to a wide range of soil types: loam, clay, chalk, sand
• Prefers nitrogen-rich, moderately moist, well-drained soil with pH 5.5–7.5
• Tolerates poor, compacted, and disturbed soils where many plants fail

Watering:
• Moderate water requirements; tolerates short dry spells once established
• Does not tolerate prolonged waterlogging
• Supplemental watering rarely necessary in temperate climates

Temperature:
• Hardy in USDA zones 4–9
• Tolerates winter temperatures down to approximately -30°C
• Dies back to the root crown in winter; regenerates vigorously in spring

Propagation:
• Primarily by seed — self-seeds prolifically and can become invasive
• Seeds germinate readily in autumn or spring; no stratification required
• Can also be propagated by root division in early spring
• Seeds remain viable in the soil seed bank for several years

Common Problems:
• Virtually pest-free due to toxic alkaloid content
• Rarely affected by fungal diseases
• Primary concern is invasiveness — can spread aggressively in garden settings
• Remove spent flower heads before seed set to prevent unwanted self-seeding
• Wear gloves when handling to avoid skin irritation from the latex