That's right! 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.