The answer to 'why is my shrub invasive plants' is that your shrub may be an invasive species that is spreading and taking over your landscape. Invasive plants can outcompete native species, spread rapidly, and be difficult to control. Common signs of an invasive shrub include aggressive growth, spreading underground runners or rhizomes, and the ability to thrive in a variety of conditions.
Some common invasive shrub species include Japanese barberry, burning bush, and multiflora rose. These plants were often introduced as ornamentals but have since become problematic weeds. To address an invasive shrub, you may need to dig up the entire plant, including the roots, and properly dispose of it. Chemical herbicides may also be necessary for larger infestations. It's best to consult a professional landscaper or horticulturist to determine the best treatment approach for your specific situation.