This stunning purple flowering plant was once a garden favorite. But it's secretly invasive and even illegal in many states, ...

Many native plants in the U.S. cannot possibly move themselves fast enough to avoid climate-change-driven extinction. If ...

Purple loosestrife, which is blooming 24 days earlier than it did a century ago, poses a serious threat to wetland habitats. Harry Campbell Since the beginning of the 20th century, the growing ...