40. Delaware – Oleander (Nerium oleander)
Oleander thrives in Delaware’s warm, suburban areas and roadside plantings. Its attractive pink, white, or yellow flowers conceal highly toxic cardiac glycosides. Ingestion can cause nausea, vomiting, slowed heartbeat, arrhythmias, and sudden death. Even inhaling smoke from burning oleander can be harmful. Historically, accidental poisonings occurred when branches were used as cooking skewers. Its ornamental value and drought tolerance make it popular, but it remains one of the most lethal plants in the state, posing a risk to children, pets, and unsuspecting gardeners.
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