Trending: eastern poison ivy (Toxicodendron radicans) — 1019 observations this week
iNaturalist Community
Citizen Science
Knowing what poison ivy looks like in its current spring growth form — before leaves fully unfurl and the classic three-leaflet pattern is obvious — could save you a miserable rash on your next trail walk or backyard cleanup.
Poison ivy is having a moment: thousands of people across the country spotted and logged it this week, helping scientists and land managers track exactly where it's growing. This plant produces an oil called urushiol that causes a nasty, itchy rash on most people who touch it. Tracking its spread helps us understand whether it's moving into new areas, which matters because a warmer climate is known to make poison ivy grow bigger and more potent.
Key Findings
1,019 research-grade observations of eastern poison ivy were recorded on iNaturalist in a single week, ranking it among the top observed plant species.
The spike in observations likely reflects peak spring emergence, when the plant is actively growing and most likely to be encountered — and misidentified — by hikers and gardeners.
Citizen-science data at this scale can reveal range shifts and habitat associations that traditional botanical surveys would miss.
chevron_right Technical Summary
Eastern poison ivy is surging in community sightings this week, with over 1,000 research-grade observations logged on iNaturalist — making it one of the most-watched plants across North America right now.
Abstract Preview
eastern poison ivy is among the most observed plant species this week with 1019 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...