Which plant is known for being toxic to humans?

Oleander is known for being toxic to humans due to the presence of toxic compounds called cardiac glycosides, which can affect heart function and lead to severe health issues. All parts of the oleander plant, including the leaves, flowers, and stems, contain these toxic substances. Ingesting even small amounts can cause symptoms such as nausea, vomiting, abdominal pain, and potentially fatal heart problems.

On the other hand, rosemary, basil, and mint are generally regarded as safe for human consumption and are commonly used in cooking and herbal remedies. While they may cause allergic reactions or gastrointestinal discomfort in some individuals, they do not possess the high levels of toxicity that oleander does, which is why oleander stands out as a plant known for its toxic properties.