Trending: eastern poison ivy (Toxicodendron radicans) — 1515 observations this week
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Phenology
Poison ivy is probably already growing along the edges of your yard, local trails, or park — and right now it's at peak visibility, making this the best time to learn to identify and avoid it before an accidental brush ruins your weekend outdoors.
Thousands of people across the country spotted and photographed poison ivy this week, making it one of the most-watched plants on iNaturalist right now. This surge in sightings likely means the plant is leafing out and spreading in parks, backyards, and wild areas near you. Poison ivy causes a nasty, itchy rash on contact, so knowing what it looks like — three shiny leaflets, often reddish when young — is genuinely useful knowledge this time of year.
Key Findings
1,515 research-grade observations of eastern poison ivy were recorded in a single week on iNaturalist, placing it among the top trending plant species.
The volume of sightings suggests a broad geographic bloom of activity, consistent with spring leaf-out and increased outdoor human activity in late April.
Citizen-science platforms like iNaturalist are capturing real-time phenological signals for allergenic plants, data that is difficult to obtain through traditional monitoring.
chevron_right Technical Summary
Eastern poison ivy is having an unusually active observation week, with 1,515 research-grade sightings logged on iNaturalist — signaling that the plant is highly visible and likely in peak seasonal growth across its range.
Abstract Preview
eastern poison ivy is among the most observed plant species this week with 1515 research-grade observations.
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
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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...