Dreamcatcher Alpacas
Plant safety · Toxic

Is Cocklebur Poisonous to Alpacas?

Cocklebur (Xanthium strumarium) — a weed. Here is what alpaca owners need to know.

Updated 2026-10-02By the Dreamcatcher Alpacas editorial team
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Yes — cocklebur is toxic to alpacas.

Keep it out of pastures, hay and reach of fences, and never feed trimmings.

Cocklebur (Xanthium strumarium)
Cocklebur (Xanthium strumarium). Photo: Karduelis, Public domain via Wikimedia Commons.
Status
Toxic
Scientific name
Xanthium strumarium
Family
Asteraceae
Plant type
Weed
Also known as
kikania, Cockle bur, Canada cockleburr, Spiny cockleburr, rough cocklebur, Rough cockleburr
Toxic parts
Seeds and seedlings at the two-leaf (cotyledon) stage
Toxic compound
Carboxyatractyloside

Why it matters

Mature plants are less toxic but their burs ruin fleece. Control cocklebur in paddocks and around feeders.

Signs of cocklebur poisoning in alpacas

  • Depression and weakness
  • Twitching, convulsions
  • Low blood sugar
  • Death within hours of eating seedlings

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 cocklebur

  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.

About the plant

Xanthium strumarium is a species of annual plants in the flowering plant family Asteraceae. Some sources claim it originates in southern Europe and Asia, but has been extensively naturalized elsewhere. Others, such as the Flora of China and Flora of North America, state it originates in the Americas but was an early introduction to Eurasia.From Wikipedia — “Xanthium strumarium”, licensed under CC BY-SA 4.0.

Where it grows

GBIF, the Global Biodiversity Information Facility, holds 59,389 recorded observations of Xanthium strumarium L. worldwide, including 21,871 in the United States. It belongs to the Asteraceae family, together with Common Groundsel, Rayless Goldenrod, Tansy Ragwort, White Snakeroot, Burdock. See the occurrence map on GBIF.

Frequently asked questions

Is cocklebur poisonous to alpacas?
Yes. Yes — cocklebur is toxic to alpacas. Mature plants are less toxic but their burs ruin fleece. Control cocklebur in paddocks and around feeders.
What part of cocklebur is toxic to alpacas?
Seeds and seedlings at the two-leaf (cotyledon) stage.
What are the symptoms of cocklebur poisoning?
Depression and weakness, twitching, convulsions, low blood sugar and death within hours of eating seedlings.
Is dried cocklebur 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 Q857159.