A plant classified as a perennial is one that lives for more than two years. Perennials can come back season after season, often exhibiting growth and blooming cycles annually. Unlike annuals, which complete their life cycle in one year, perennials develop their root systems and structures over time, allowing them to survive adverse conditions. Common examples of perennial plants include peonies, daylilies, and lavender. This classification is essential in gardening and agriculture as perennials require less frequent replanting, contributing to sustainability and biodiversity.