In the 1640s, Europeans carried St. John’s wort to America as a cure-all; its seeds spread across rangelands, making sheep and horses vulnerable to sunlight

St. John’s wort, once cherished for its medicinal properties, was introduced to America by early settlers and rapidly proliferated throughout the landscape. Although its hypericin compound offers benefits to humans, it can lead to photosensitization in grazing animals. Studies show that cattle are more resilient to hypericin compared to sheep and horses. This plant’s adaptability illustrates the broader environmental influences on species interactions.
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