Dreamcatcher Alpacas
Plant safety · Toxic

Is Black Locust Poisonous to Alpacas?

Black Locust (Robinia pseudoacacia) — a tree. Here is what alpaca owners need to know.

Updated 2026-10-02By the Dreamcatcher Alpacas editorial team
!

Yes — black locust is toxic to alpacas.

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

Black Locust (Robinia pseudoacacia)
Black Locust (Robinia pseudoacacia). Photo: Annabell Hormann / korina.info, CC BY-SA 4.0 via Wikimedia Commons.
Status
Toxic
Scientific name
Robinia pseudoacacia
Family
Fabaceae
Plant type
Tree
Also known as
locust tree, False Acacia, false acacia
Toxic parts
Bark, sprouts, seeds and leaves
Toxic compound
Robin and phasin (lectins)

Why it matters

Livestock that chew bark or eat trimmings are at risk. Honey locust (Gleditsia) is a different, low-risk tree.

Signs of black locust poisoning in alpacas

  • Loss of appetite and depression
  • Colic and diarrhea
  • Weakness, irregular heartbeat

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 black locust

  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

Robinia pseudoacacia, commonly known as black locust, is a medium-sized hardwood deciduous tree, belonging to the tribe Robinieae of the legume family. Another common name is false acacia, a literal translation of the specific name.From Wikipedia — “Robinia pseudoacacia”, licensed under CC BY-SA 4.0.

Where it grows

GBIF, the Global Biodiversity Information Facility, holds 513,743 recorded observations of Robinia pseudoacacia L. worldwide, including 41,239 in the United States. It belongs to the Fabaceae family, together with Rosary Pea, Coffee Senna & Sicklepod, Kentucky Coffeetree, Laburnum, Lupine. See the occurrence map on GBIF.

Frequently asked questions

Is black locust poisonous to alpacas?
Yes. Yes — black locust is toxic to alpacas. Livestock that chew bark or eat trimmings are at risk. Honey locust (Gleditsia) is a different, low-risk tree.
What part of black locust is toxic to alpacas?
Bark, sprouts, seeds and leaves.
What are the symptoms of black locust poisoning?
Loss of appetite and depression, colic and diarrhea and weakness, irregular heartbeat.
Is dried black locust 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 Q157417.