In 1908, the USDA imported disease-resistant Callery pear; its once-sterile-looking ornamental descendants cross-pollinated and invaded American fields
Originally imported to protect pear orchards, Callery pear trees have become a significant invasive species. These trees, once popular ornamentals, now spread aggressively across natural landscapes. Their rapid growth and dense thickets outcompete native vegetation, reducing biodiversity. While initially thought to be sterile, different cultivars cross-pollinate, producing fertile offspring. Many…
The Times of India ·