Poison Ivy in Wisconsin: How to Spot and Avoid It

Poison Ivy in Wisconsin: How to Spot and Avoid It

Poison ivy (Toxicodendron radicans) is a common hazard for foragers, hikers, and gardeners in Wisconsin. Its urushiol oil can cause itchy rashes, turning outdoor adventures into a nightmare. In this guide, I’ll break down how to identify the two types of poison ivy in Wisconsin, where they grow, and what to do if you come into contact. Stay safe and explore itch-free!

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“Leaves of three, let them be; if it’s shiny, watch your hiney!” – Nikki

Identifying Poison Ivy: Know Your Foe

Poison ivy can appear as a vine, shrub, or ground cover, but these traits help you spot it:

• Leaves of Three: Three leaflets per leaf, with the center leaflet larger. Leaflets may be smooth, lobed, or toothed.
• Hairy Stems: Stems and veins have a slightly hairy texture.
• Color Changes: Green in spring/summer, red or orange in fall.

Where Poison Ivy Grows in Wisconsin

Poison ivy thrives across Wisconsin in:

• Forests and woodlands
• Fields, meadows, and riverbanks
• Roadsides and urban parks

It adapts to various soils and light conditions, so stay vigilant on trails like the Mountain Bay or in your backyard.

Types of Poison Ivy in Wisconsin

Wisconsin hosts two variants:

Eastern Poison Ivy (Toxicodendron radicans var. radicans)

• Where Found: Forests, fields, riverbanks, urban areas.
• Traits: Shiny, smooth-edged leaflets; grows as a vine or shrub; white-gray berries.
• Fall Color: Reddish hues.

Images of Eastern Poison Ivy

Western Poison Ivy (Toxicodendron radicans var. rydbergii)

• Where Found: Open woodlands, riverbanks, dry rocky areas in western Wisconsin.
• Traits: Three or five symmetrical leaflets; vine or shrub; yellow-green berries.
• Fall Color: Reddish or yellowish.

Images of Western Poison Ivy