What type of plant is Knotweed classified as?

Knotweed is classified as a perennial plant. This means that it lives for more than two years and remains active in growth during the growing season each year. Perennials typically have deeper root systems compared to annuals and can regrow each season from their established roots, which is a characteristic feature of knotweed.

In contrast, summer annuals complete their life cycle in one growing season, germinating, growing, flowering, seeding, and dying within that period. Winter annuals germinate in the fall, grow during the winter, and complete their life cycle in the spring. Biennials require two growing seasons to complete their life cycle. Knotweed does not fit into these classifications due to its perennial nature. Therefore, the classification of knotweed as a perennial plant correctly reflects its biological characteristics and growth habits.