Greater celandine (Chelidonium majus) observed in Guelph, ON N1E 5X6, Canada
iNaturalist: bryneal
Invasive Species
Greater celandine spreads aggressively along disturbed edges and fence lines — if you spot its deeply lobed leaves and bright yellow flowers in your yard, pulling it before it seeds can stop a patch that would otherwise double every season.
Someone in Guelph, Ontario spotted and documented Greater celandine, a plant originally from Europe that has spread widely across North America. It has bright yellow flowers and produces an orange sap when its stem is broken. While it has some traditional herbal uses, it can spread quickly in gardens and natural areas, crowding out other plants.
Key Findings
Research-grade observation confirmed Greater celandine presence in Guelph, ON N1E 5X6, expanding citizen-science range data for this species in southern Ontario
Greater celandine (Chelidonium majus) is a non-native European introduction now naturalized across much of eastern Canada and the northeastern United States
iNaturalist research-grade status indicates the identification was verified by multiple community members, adding reliable data to continental distribution records
chevron_right Technical Summary
A research-grade observation of Greater celandine was recorded in Guelph, Ontario, Canada, confirming its established presence in an urban residential area. This iNaturalist sighting contributes to community tracking of this non-native European plant across North America.
Abstract Preview
Research-grade observation of Greater celandine in Guelph, ON N1E 5X6, Canada.
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Species Mentioned
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Chelidonium majus, the greater celandine, is a perennial herbaceous flowering plant in the poppy family Papaveraceae. One of two species in the genus Chelidonium, it is native to Europe and western Asia and introduced widely in North America.