One of the surest signs that spring has arrived each year is the blooming of the Bradford pear trees. Widely planted as a street tree, in the parking lots of malls and offices, and in home landscapes, they’re impossible to miss: oval-canopied trees with a mantle of white flowers so thick that it almost resembles snow.
WHAT YOU'LL LEARN HERE
Understanding Invasive Species
Once introduced, invasive species spread quickly and aggressively, often because they don’t have natural predators. They then compete with native species for resources.
According to a 2010 tree census conducted by the U.S. Forest Service and The Morton Arboretum, buckthorn is the most common tree in the Chicago region. Common, or European, Buckthorn, and glossy buckthorn were brought to the midwest to be used as hedging material.