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Poison Hemlock
One of the deadliest plants in North America - the poison that killed Socrates - and a dangerous look-alike for edible carrot-family plants. Learn it, never touch it, and never confuse it with wild carrot or parsley.
Safety notes DEADLY POISON - never eat, taste, or plant any part; the coniine alkaloids cause paralysis and death, and there is no antidote. Its greatest danger is being MISTAKEN for edible carrot-family plants (Queen Anne's lace, wild parsnip, parsley) - never forage the family unless you have 100% ruled out poison hemlock. Never burn it; keep it from children, pets, and livestock; suspected ingestion is an emergency. A listed noxious weed in many states; some require landowners to control it.
Overview
Poison hemlock (Conium maculatum) is among the most lethally poisonous plants on the continent, and one every forager and parent should be able to identify. Every part contains coniine and related alkaloids that attack the nervous system; ingesting even a small amount can cause paralysis and death, with no antidote. It is, famously, the poison used to execute the philosopher Socrates in ancient Athens.
Introduced from Europe, it's now a widespread invasive weed across North America, growing tall (6-10 feet) along roadsides, ditches, fields, and stream banks. Its greatest danger is that it belongs to the carrot family (Apiaceae) and closely resembles edible relatives - wild carrot (Queen Anne's lace), wild parsnip (whose own sap causes blistering sunlight burns - handle the tops with covered skin), parsley, chervil - so foragers have been poisoned mistaking it for food. This entry is an identification and safety guide with one overriding message: learn its distinguishing marks (purple-spotted smooth stems, a musty smell), never eat any wild carrot-family plant you can't rule it out from, and keep it away from children, pets, and livestock. Knowing poison hemlock can save a life.
The one thing to knowPurple-spotted smooth stems and a musty smell. Never eat a wild carrot-family plant you cannot rule this out from.
Quick facts
For identification. Not a growing guide.
- Height
- 7 ftRange: 3–10 ft
- Spread
- 30 inRange: 18–48 in
- Cold
- Takes hard frostdamaged below -25°F
- Heat
- Struggles above 100°F
- Life cycle
- Biennial
- Self-sows
- Yes. Never let it set seed.
- Habitat
- Full sun · Part sun · Part shade, consistently moist 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
Year 1 rosette (identify & avoid)
Mar to Oct, every year
Know this stage
-
First-year rosette - fern-like, parsley-like leaves
In its first year, poison hemlock is a ground rosette of finely divided, glossy, fern-like or parsley-like leaves - which is exactly when it's most often confused with edible plants. Even at this stage, look for the tell-tale PURPLE SPOTS/BLOTCHES on the smooth, hairless stems, and note the musty, unpleasant 'mousy' smell when crushed. Do not touch or taste it.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Poisoning by Ingestion (deadly)Severity High HazardnowSeason: year-roundAny ingestion of the plant (or of a misidentified 'wild carrot/parsley'); symptoms can include trembling, weakness, dilated pupils, slowed breathing, and paralysis - a medical emergency.
Any ingestion of the plant (or of a misidentified 'wild carrot/parsley'); symptoms can include trembling, weakness, dilated pupils, slowed breathing, and paralysis - a medical emergency.
Suspected ingestion is an EMERGENCY - call poison control / emergency services immediately; do not induce anything or wait for symptoms. There is no antidote; treatment is supportive medical care.
Never eat any part; never forage a carrot-family plant without ruling out poison hemlock (purple-spotted hairless stems, musty smell); keep it from children, pets, and livestock; remove it from accessible areas.
The hazard is lethal poisoning of people or animals: all parts contain coniine alkaloids that cause nervous-system failure, paralysis, and death if eaten, with no antidote. The greatest risk is mistaking it for an edible carrot-family plant.
Invasive Self-SeedingSeverity Medium DisordernowSeason: Jul–OctSeed-laden second-year plants and expanding stands along roadsides, ditches, and field edges.
Seed-laden second-year plants and expanding stands along roadsides, ditches, and field edges.
Repeated safe removal before seeding, plus targeted herbicide on larger stands, over several seasons to exhaust the seed bank.
Remove plants (safely) before they set seed; monitor and pull new rosettes; persistent multi-year control is needed.
Not a health hazard directly but why it persists and spreads: each plant produces huge numbers of seeds that spread and survive years in the soil, so poison hemlock reappears and colonizes new ground.
Sap & Removal HazardSeverity Medium HazardSeason: Apr–AugSkin irritation from sap contact; symptoms after heavy exposure while clearing large stands unprotected.
Skin irritation from sap contact; symptoms after heavy exposure while clearing large stands unprotected.
Wash exposed skin; for symptoms after heavy exposure, seek medical care; always avoid inhaling dust or smoke from the plant.
Wear gloves, cover skin, and use a mask when removing it; never burn it; work in the rosette/early-bolt stage when possible and bag the material.
Beyond ingestion, the sap can irritate skin, and cutting or clearing large stands can release toxins into the air; smoke from burning it is dangerous to inhale.
Grower tips
Notes from growers, tagged with the zone they grow in. A person reads every post before it appears.
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