Polygonum cuspidatum, commonly known as Japanese knotweed, is a perennial plant native to East Asia. It features hollow stems, large heart-shaped leaves, and clusters of small white flowers. This plant typically grows in dense thickets and can reach heights of up to 10 feet. Japanese knotweed is known for its rapid growth and ability to spread aggressively, often invading gardens and natural habitats. It can cause structural damage to buildings and infrastructure due to its extensive root system. Control measures often include physical removal and herbicide application to manage its spread effectively.