Dreamcatcher Alpacas
Plant safety · Deadly

Is Water Hemlock Poisonous to Alpacas?

Water Hemlock (Cicuta maculata) — a wild plant. Here is what alpaca owners need to know.

Updated 2026-10-02By the Dreamcatcher Alpacas editorial team
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Yes — water hemlock is highly poisonous. Small amounts can kill.

Keep alpacas completely away from this plant, including clippings and fallen leaves.

Water Hemlock (Cicuta maculata)
Water Hemlock (Cicuta maculata). Photo: Williammehlhorn at English Wikipedia, Public domain via Wikimedia Commons.
Status
Deadly
Scientific name
Cicuta maculata
Family
Apiaceae
Plant type
Wild plant
Also known as
Spotted cowbane, Cowbane, spotted water hemlock
Toxic parts
Whole plant, most concentrated in the tuberous roots; one root can kill
Toxic compound
Cicutoxin (convulsant)
Region
Wet areas across North America

Why it matters

Considered the most toxic plant in North America. Grows in wet ditches, stream banks and marshy pasture. Roots are exposed when soil is wet or plants are pulled.

Signs of water hemlock poisoning in alpacas

  • Drooling and frothing
  • Muscle twitching
  • Violent convulsions
  • Death within 15 minutes to a few hours

Signs can appear within minutes (cyanide, cardiac toxins) or only after weeks of exposure (liver toxins). Many poisoned camelids are simply found dead, so prevention is everything.

What to do if your alpaca ate water hemlock

  1. Move the herd away and remove any remaining plant material, clippings or fallen leaves.
  2. Call your veterinarian immediately, even if the alpaca looks normal. Say what was eaten, roughly how much and when.
  3. Bring a sample or clear photo of the plant to help identification.
  4. Do not give home remedies, oils or try to make the alpaca vomit unless your vet tells you to.
  5. Keep the animal quiet, in shade or shelter, with water available. Write down the time and every symptom you see.
  6. Check every other alpaca that had access, then remove the plant permanently (including roots).

Emergency: call your veterinarian immediately. If you cannot reach them, contact an animal poison control service (in the U.S., the ASPCA Animal Poison Control Center or Pet Poison Helpline; fees may apply). Bring a sample or photo of the plant.

Look-alikes

Water Hemlock can be confused with: Queen Anne's lace; Poison hemlock; Wild parsnip. When unsure, photograph the leaves, stem and flowers and ask your local extension office or a botanist.

About the plant

Cicuta maculata is a highly poisonous species of flowering plant in the carrot family known by several common names, including spotted water hemlock, spotted parsley, and spotted cowbane. It is native to nearly all of North America, from northern Canada to southern Mexico.From Wikipedia — “Cicuta maculata”, licensed under CC BY-SA 4.0.

Where it grows

Main range of concern: Wet areas across North America. GBIF, the Global Biodiversity Information Facility, holds 19,295 recorded observations of Cicuta maculata L. worldwide, including 14,717 in the United States. It belongs to the Apiaceae family, together with Poison Hemlock, Western Water Hemlock, Queen Anne's Lace. See the occurrence map on GBIF.

Frequently asked questions

Is water hemlock poisonous to alpacas?
Yes. Yes — water hemlock is highly poisonous. Small amounts can kill. Considered the most toxic plant in North America. Grows in wet ditches, stream banks and marshy pasture. Roots are exposed when soil is wet or plants are pulled.
What part of water hemlock is toxic to alpacas?
Whole plant, most concentrated in the tuberous roots; one root can kill.
What are the symptoms of water hemlock poisoning?
Drooling and frothing, muscle twitching, violent convulsions and death within 15 minutes to a few hours.
Is dried water hemlock safe?
Drying does not reliably make poisonous plants safe. Treat dried leaves and contaminated hay with the same caution.

Keeping pastures safe

  • Walk every paddock and fence line each season and remove toxic plants, including roots.
  • Never throw garden, hedge or lawn clippings over the fence.
  • Check pastures after storms for fallen branches (cherry, red maple).
  • Buy hay from known sources and inspect it for weeds.
  • Keep pastures well managed — hungry alpacas eat plants they would normally avoid.

Browse the full toxic plant checker, the printable list of poisonous plants and the list of safe plants.

This page is educational and does not replace advice from a veterinarian who has examined your animals. Camelid medicine uses many drugs “extra-label”, so dosing must come from your vet. In an emergency, call your vet first. Read our disclaimer · How we write and review content.

Data: plant status compiled from veterinary toxicology references (see sources); taxonomy and occurrences from GBIF; identifiers from Wikidata Q5119480.