Dreamcatcher Alpacas
Plant safety · Deadly

Is Poison Hemlock Poisonous to Alpacas?

Poison Hemlock (Conium maculatum) — 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 — poison hemlock is highly poisonous. Small amounts can kill.

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

Poison Hemlock (Conium maculatum)
Poison Hemlock (Conium maculatum). Photo: MPF, CC BY-SA 3.0 via Wikimedia Commons.
Status
Deadly
Scientific name
Conium maculatum
Family
Apiaceae
Plant type
Wild plant
Toxic parts
All parts, fresh or dried; most toxic before seed set
Toxic compound
Coniine and related piperidine alkaloids

Why it matters

Tall plant with purple-blotched hairless stems and a musty 'mousy' smell. Common along roadsides, fence lines and disturbed ground. Do not confuse with the harmless hemlock tree (Tsuga).

Signs of poison hemlock poisoning in alpacas

  • Trembling and incoordination
  • Excess salivation
  • Dilated pupils, slow breathing
  • Death from respiratory paralysis
  • Birth defects (crooked legs, cleft palate) if eaten in early pregnancy

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 poison 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

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

About the plant

Conium maculatum, commonly known as hemlock or poison hemlock, is a highly poisonous flowering plant and a nitrophile weed species in the carrot family Apiaceae.From Wikipedia — “Conium maculatum”, licensed under CC BY-SA 4.0.

Where it grows

GBIF, the Global Biodiversity Information Facility, holds 204,212 recorded observations of Conium maculatum L. worldwide, including 33,572 in the United States. It belongs to the Apiaceae family, together with Water Hemlock, Western Water Hemlock, Queen Anne's Lace. See the occurrence map on GBIF.

Frequently asked questions

Is poison hemlock poisonous to alpacas?
Yes. Yes — poison hemlock is highly poisonous. Small amounts can kill. Tall plant with purple-blotched hairless stems and a musty 'mousy' smell. Common along roadsides, fence lines and disturbed ground. Do not confuse with the harmless hemlock tree (Tsuga).
What part of poison hemlock is toxic to alpacas?
All parts, fresh or dried; most toxic before seed set.
What are the symptoms of poison hemlock poisoning?
Trembling and incoordination, excess salivation, dilated pupils, slow breathing, death from respiratory paralysis and birth defects (crooked legs, cleft palate) if eaten in early pregnancy.
Is dried poison hemlock safe?
No — the toxin in this plant remains active when dried, so contaminated hay and dried clippings are still dangerous.

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 Q218041.