Poisonous Plant Quiz

OleanderSorry! That's the wrong answer. This is Oleander. Oleander is a common outdoor woody shrub in warmer regions and is grown occasionally as a large potted plant. Its flowers are show and very fragrant, but the belief that their perfume is dangerous is unfounded.

Oleander ranks with yew in toxicity. Oleander contains a poisonous principle similar to digitalis in its effect on the heart, causing arrhythmia and cardiac arrest. The effects are reversible and the horse may recover if he ingests a less-than-lethal dose (a single ounce of oleander leaves can kill a 1,000 lb. horse).


  • colic
  • sweting
  • bloody diarrhea
  • difficult breathing
  • arrhythmia

A veterinarian should be consulted immediately for supportive treatment to reduce the damage caused by ingestion of poisonous plants.

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For more information:
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E-mail: ag.info.omafra@ontario.ca

Author: Penny Lawlis - Animal Care Specialist/OMAFRA
Creation Date: Not Available
Last Reviewed: November 2003