iNaturalist:
Sugar maple spotting slows as Canada's fall color fades
iNaturalist:
Red oak spotting slows down as fall colors fade
iNaturalist:
This fuzzy forest moss is suddenly everywhere in Canada
iNaturalist:
Milkweed sightings stay high across Canada as autumn sets in
iNaturalist:
Invasive buckthorn sightings surge across Canada this week
iNaturalist:
Pokeweed sightings dip slightly as fall observation seaso...
iNaturalist:
This weedy wetland plant is everywhere on iNaturalist this week
iNaturalist:
Eastern redcedar is having a moment on iNaturalist this week
iNaturalist:
Sugar maple spotting slows as Canada's fall color fades
iNaturalist:
Red oak spotting slows down as fall colors fade
iNaturalist:
This fuzzy forest moss is suddenly everywhere in Canada
iNaturalist:
Milkweed sightings stay high across Canada as autumn sets in
Trending: eastern poison ivy (Toxicodendron radicans) — 923 observations this week
iNaturalist · 2026-05-23
Eastern poison ivy is surging in iNaturalist observations this week, with 923 research-grade sightings logged across its range. This spike likely reflects peak seasonal activity as the plant leafs out and hikers venture into woods and trails.
1
923 research-grade observations recorded in a single week, ranking eastern poison ivy among the top observed plant species nationally
2
Observation spike aligns with late-spring leaf-out period when urushiol-containing leaves are newly emerged and contact risk is elevated
3
Citizen-science data captures real-time geographic distribution, helping track range shifts and density in suburban and urban-edge habitats
