Japanese knotweed, Polygonum cuspidatum, is an aggressive invasive plant that grows vigorously along roadsides, wetland habitat, and utility rights of way. It may take years to control as new growth from rhizomes occurs even if the original plants are killed. Cutting back repeatedly is helpful, but works better when an herbicide is applied to open wounds on the plant after cutting. If you are struggling to manage Japanese Knotweed in your area, take a look at the recommendations at the link below and keep up with treatments to stop the spread!