12. Pennsylvania – Mountain Laurel (Kalmia latifolia)
Mountain laurel, Pennsylvania’s state flower, is stunning when in bloom with its pink and white blossoms. Despite its beauty, every part of the plant is toxic due to grayanotoxins. Ingestion can lead to drooling, vomiting, slowed heart rate, seizures, and respiratory failure. Even honey made from mountain laurel nectar can be poisonous. Native to forests and hillsides, the plant is often used ornamentally, increasing accidental exposure. Its thick evergreen leaves remain toxic year-round, making mountain laurel a hidden but persistent danger in the state.
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