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Poison Sumac
The wetland cousin of poison ivy - and the most severe of the urushiol plants. A white-berried shrub of bogs and swamps, and the dangerous look-alike of the edible red sumac. Learn it, and never touch it.
Safety notes DO NOT TOUCH. Poison sumac carries the same URUSHIOL allergen as poison ivy, causing an intensely itchy, blistering rash often worse than poison ivy's. KEY ID: a shrub of WET bogs and swamps, with pinnately compound leaves (7-13 leaflets, red stalks) and DROOPING white/green berries - NOT the edible red-berried sumac (upright red clusters, dry sites). NEVER BURN it (the smoke harms the lungs). If exposed, wash skin and anything it touched promptly with soap and cool water.
Overview
Poison sumac (Toxicodendron vernix) is the least familiar but arguably the most severe of North America's three common urushiol plants. Like poison ivy and poison oak, it belongs to the genus Toxicodendron and carries urushiol - the same oily allergen - in every part, causing an intensely itchy, blistering allergic rash that is often worse than poison ivy's. It's a shrub or small tree of wet ground: bogs, swamps, marsh edges, and wet woods across the eastern United States.
Two things make poison sumac worth knowing precisely. First, it looks nothing like poison ivy's 'leaves of three' - it has pinnately compound leaves of 7 to 13 leaflets on a often-red stalk, and it bears loose, drooping clusters of white or pale-green berries. Second, it shares a name with the completely different, edible red-berried sumacs (staghorn, smooth), which people harvest for a lemonade-like drink and spice. The distinction is life-comfort-critical: edible sumac has UPRIGHT RED fuzzy berries in dry, sunny sites; poison sumac has DROOPING WHITE berries in wet swamps. This entry is an identification and safety guide - poison sumac is a genuine native wetland plant, not something to plant, and the goal is simply to recognize it and give it a wide berth.
The one thing to knowPoison sumac (Toxicodendron vernix) is the least familiar but arguably the most severe of North America's three common urushiol plants.
Quick facts
For identification. Not a growing guide.
- Height
- 15 ftRange: 5–30 ft
- Spread
- 10 ftRange: 4–20 ft
- Cold
- Takes hard frostdamaged below -30°F
- Heat
- Struggles above 100°F
- Life cycle
- Perennial, lives about 30 years
- Self-sows
- Yes. Never let it set seed.
- Habitat
- Full sun · Part sun · Part shade, tolerates wet soil soil
Through the year
A field guide through time
Explore the stages to recognize this plant throughout its life.
Stage 1 of 3 · The recurring year
Compound leaves in wet ground (identify & avoid)
Apr to Aug, every year
Know this stage
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Pinnate leaves, RED stalks, WET ground - not 'leaves of three'
Unlike poison ivy/oak, poison sumac does NOT have leaves of three. It has pinnately compound leaves of 7-13 smooth-edged leaflets arranged along a central stalk, and that leaf stalk (rachis) is often distinctly RED. It grows only in WET places - bogs, swamps, marsh edges, and wet woods. A smooth-margined, red-stalked compound leaf on a shrub standing in wet ground is the profile to avoid.
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Never touch it - and know the harmless look-alikes
Distinguish it from harmless plants with similar compound leaves: ash and native mountain-ash have TOOTHED leaflets and grow in drier ground; the edible red sumacs also have toothed leaflets, dry sunny sites, and upright RED berries. Poison sumac's leaflets are smooth-edged, it lives in wet ground, and its berries droop and are white. When unsure, do not touch it.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Urushiol Exposure (to people)Severity High DisordernowSeason: year-roundAny skin contact with the plant; a red, itchy, blistering rash appearing 12-72 hours later, often in streaks where the plant brushed the skin.
Any skin contact with the plant; a red, itchy, blistering rash appearing 12-72 hours later, often in streaks where the plant brushed the skin.
Wash skin and everything it touched promptly with soap and cool water or a urushiol remover; treat rash with cool compresses, calamine, and antihistamines; seek medical care for severe, facial, widespread, or breathing-related reactions.
Learn to identify it (smooth compound leaves, red stalks, white drooping berries, wet habitat), don't touch it, cover up fully near it, keep pets clear, and NEVER burn it (the smoke is dangerous to inhale).
The hazard is to you, not the plant: every part of poison ivy contains urushiol, an oil that causes an intensely itchy, blistering allergic contact dermatitis in most people. The oil is active year-round (even on dead plants and bare winter vines) and spreads readily from tools, clothing, and pet fur.
Confusion with Edible SumacSeverity Medium DisorderSeason: Jun–SepThe key difference - poison sumac has WHITE/green DROOPING berries and smooth leaflets in WET swamps; edible sumac has RED, UPRIGHT, fuzzy berry cones and toothed leaflets in DRY sunny sites.
The key difference - poison sumac has WHITE/green DROOPING berries and smooth leaflets in WET swamps; edible sumac has RED, UPRIGHT, fuzzy berry cones and toothed leaflets in DRY sunny sites.
For a poison-sumac rash, wash promptly and treat like poison ivy (cool compresses, calamine, antihistamines; a doctor for severe cases). Cross-reference the edible 'sumac' entry to keep the two apart.
Only harvest red, upright, fuzzy berry clusters from dry sites; never touch or eat anything with white drooping berries or growing in a bog/swamp; when in doubt, don't.
A safety hazard to the forager: because it shares the name 'sumac' with the edible red-berried sumacs, beginners can confuse this toxic wetland plant with the harmless one foraged for drink and spice.
Spread by Birds & RootsSeverity Low DisordernowSeason: Apr–OctNew poison ivy seedlings under trees, fences, and perches (where birds sit), and regrowth from roots after cutting.
New poison ivy seedlings under trees, fences, and perches (where birds sit), and regrowth from roots after cutting.
Repeated safe removal or a suitable, water-safe herbicide over time; monitor wetland edges where new plants establish.
Remove plants (safely, with full protection) before they berry to limit bird-spread seed, and dig out roots as completely as possible.
Not a pest but why it keeps appearing: birds eat the white berries and spread the seed widely, and established plants regrow vigorously from roots and rhizomes, so poison ivy reappears in new spots and after removal.
Grower tips
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