iNaturalist · 2026-03-28
Lesser celandine, a small flowering plant native to Europe and western Asia, is surging in iNaturalist observations this spring with 812 research-grade sightings in a single week — signaling its peak bloom period and raising awareness of its invasive spread across North America.
812 research-grade observations of lesser celandine were recorded on iNaturalist in a single week, marking it as one of the most-observed plant species during that period.
The observation spike aligns with the plant's early-spring bloom window, when it is most visible and most actively spreading before native vegetation emerges.
Citizen science data from iNaturalist is capturing real-time geographic spread of this invasive species, providing valuable distribution data across multiple countries and regions.
