50. Maine – Oleander (Nerium oleander)
Oleander, occasionally cultivated in Maine’s warm microclimates, is highly toxic despite its ornamental appeal. Pink, white, or yellow flowers conceal cardiac glycosides that can cause nausea, vomiting, irregular heartbeat, arrhythmias, and sudden death. Inhalation of smoke from burning wood can also be harmful. Historical poisonings occurred when branches were used in cooking. Even though rare in Maine, the plant remains a serious risk in gardens and public spaces, demonstrating that beauty can be deceiving when it comes to toxic flora.
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