Apiaceae
Poison hemlock
Conium maculatum
- Family
- Apiaceae
- Genus
- Conium
Pets and kids
- CatsToxic
- DogsToxic
- KidsToxic
Why
Cats: Toxic
Toxic to cats (severe). Toxic principle: piperidine alkaloids (coniine).
Signs: drooling, tremors, agitation, diarrhea, paralysis.
- Poison Hemlock - Toxic and Non-toxic Plants - ASPCA ASPCA Animal Poison Control
Dogs: Toxic
Toxic to dogs (severe). Toxic principle: piperidine alkaloids (coniine).
Signs: drooling, tremors, agitation, diarrhea, paralysis.
- Poison Hemlock - Toxic and Non-toxic Plants - ASPCA ASPCA Animal Poison Control
Kids: Toxic
Toxic to young children (severe). Toxic principle: coniine.
Signs: vomiting, excessive salivation, muscle weakness, seizures, respiratory failure.
- Can poison hemlock be deadly? - Poison Control Poison control
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Is Poison hemlock safe for cats, dogs and kids?
Is Poison hemlock safe for cats?
No. Our sources call Poison hemlock toxic to cats (severe). Toxic principle: piperidine alkaloids (coniine). Signs: drooling, tremors, agitation, diarrhea, paralysis.
- Poison Hemlock - Toxic and Non-toxic Plants - ASPCA ASPCA Animal Poison Control
Is Poison hemlock safe for dogs?
No. Our sources call Poison hemlock toxic to dogs (severe). Toxic principle: piperidine alkaloids (coniine). Signs: drooling, tremors, agitation, diarrhea, paralysis.
- Poison Hemlock - Toxic and Non-toxic Plants - ASPCA ASPCA Animal Poison Control
Is Poison hemlock safe for kids?
No. Our sources call Poison hemlock toxic to young children (severe). Toxic principle: coniine. Signs: vomiting, excessive salivation, muscle weakness, seizures, respiratory failure.
- Can poison hemlock be deadly? - Poison Control Poison control
Ate some? Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 (a fee may apply). For a child, call Poison Help at 1-800-222-1222 (US). If they are struggling to breathe or collapse, call 911. Don't give anything by mouth unless a vet or poison expert tells you to.
See all cat-safe plants, dog-safe plants and child-safe plants.
Common names
By language (21)
- Arabic
- بسبس بري, شوكران, طحماء
- Asturian
- Cicuta, Fediondu, Llabera, Llaberón, Llecherina, Marguienzu, Mexacán
- Belarusian
- Блёкат, Омег, Пятрушнік
- Chinese
- 新疆藁本, 西伯利亚毒参, 西伯利亞毒蔘
- Danish
- Skarntydesaft
- English
- Poison hemlock, Hemlock
- Finnish
- Täplämyrkkykatko
- French
- Grande Ciguë, Ciguë tachetée, Grande cigüe
- German
- Fleckschierling
- Hungarian
- Bürök
- Latvian
- Suņstobrs
- Macedonian
- Пегав буќинеш
- Norwegian Bokmål
- Skarntyde
- Norwegian Nynorsk
- Skarntyde
- pcd
- Biblo, Bibu, Su
- Polish
- Pietrasznik plamisty, Psia pietruszka, Szaleń plamisty, Weszka, Świńska wesz
- Quechua
- Jama jama, Nukña perejil
- Russian
- Блекота, Болиголов крапчатый, Вонючая трава, Кониевая трава, Омег пятнистый, Собачий дягиль, Царь-трава
- scn
- Cicùta
- Slovak
- Motožník, Rozpuk, Svinská voš
- Welsh
- Cegr pumbys
Synonyms
- Cicuta major Garsault
- Cicuta major Lam.
- Cicuta officinalis Crantz
- Conium ceretanum Sennen
- Conium cicuta (Crantz) Neck.
- Conium croaticum Waldst. & Kit. ex Willd.
- Conium leiocarpum (Boiss.) Stapf
- Conium maculatum subsp. croaticum (Waldst. & Kit. ex Willd.) Drude
- Conium maculatum subsp. leiocarpum (Boiss.) Drude
- Conium maculatum subsp. viride (DC.) Espeut
- Conium maculatum var. barceloi O.Bolòs & Vigo
- Conium maculatum var. immaculatum Schur
- Conium maculatum var. leiocarpum Boiss.
- Conium maculatum var. viride DC.
- Conium maculosum Pall.
- Conium nodosum Fisch. ex Steud.
- Conium pyrenaicum Sennen & Elias
- Conium sibiricum hort. ex Steud.
- Conium strictum Tratt.
- Conium tenuifolium Mill.
- Coriandrum cicuta Crantz
- Coriandrum maculatum Roth
- Selinum conium E.H.L.Krause
- Sium conium Vest
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Biennial
- In the US and Canada
- Canada: introduced, Lower 48 states: introduced
Photos
Photo: MPF, CC BY-SA 3.0, from Wikimedia Commons 
Photo: ChrisInMilton, CC BY-SA 4.0, from Wikimedia Commons
More in Conium
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.