If you venture along the hiking trails at White Clay Creek State Park in Newark, you come across a long vine with triangular leaves and stems covered with barbs.
This is the invasive mile-a-minute weed. In the 1930s, the vine traveled from Asia to a nursery in Pennsylvania, where in a matter of years, it broke loose and began to conquer the surrounding the environment. The weed has now has invaded 12 states in the Northeastern and Mid-Atlantic regions of the U.S. In Delaware, the mile-a-minute weed has a patchy presence. In addition to White Clay Creek State Park, it can also be seen in tax ditches downstate.