Trending: eastern poison ivy (Toxicodendron radicans) — 941 observations this week
iNaturalist Community
Invasive Species
Poison ivy is probably already growing along the edges of your yard, favorite hiking trail, or neighborhood park right now — and it's at its most potent and easiest to accidentally touch during this spring flush.
Thousands of people across the country are spotting and reporting poison ivy this week, more than almost any other plant. Poison ivy is the plant famous for causing that intensely itchy, blistering rash when you touch it — and spring is when it's growing fast and spreading into new spots. Knowing it's having a big week is a good reminder to watch your step in green spaces.
Key Findings
941 research-grade observations of eastern poison ivy were recorded on iNaturalist in a single week, placing it among the most observed plant species.
The observation spike aligns with spring leaf-out season, when poison ivy produces fresh urushiol-coated leaves that are particularly potent.
Citizen-science reporting at this scale helps map the plant's current range and seasonal activity across North America in near real time.
chevron_right Technical Summary
Eastern poison ivy is surging in observations this week, with 941 research-grade sightings logged on iNaturalist. This spike likely reflects peak spring growth when the plant is actively leafing out and most likely to cause contact dermatitis.
Abstract Preview
eastern poison ivy is among the most observed plant species this week with 941 research-grade observations.
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Toxicodendron radicans, commonly known as eastern poison ivy or poison ivy, is a species of allergenic flowering plant. It has numerous subtaxons and forms both vines and shrubs. Despite its common name, it is not a true ivy, but rather a member of the cashew and sumac family, Anacardiaceae. It i...