11. Michigan – White Snakeroot (Ageratina altissima)
White snakeroot grows in wooded and shaded areas throughout Michigan. It produces small clusters of white flowers that appear harmless, yet the plant contains tremetol, a potent toxin. When ingested, it can cause nausea, muscle weakness, tremors, and heart failure. Historically, white snakeroot was responsible for “milk sickness” in the 19th century, when toxins passed from cows that ate the plant into milk consumed by humans, causing widespread deaths. All parts of the plant are poisonous, especially the leaves and stems. Its subtle appearance makes it particularly dangerous to livestock and unsuspecting foragers.
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