Perennial plants, often referred to as evergreen plants, are those that live for more than two years. Unlike annuals, which complete their life cycle in one growing season, perennials return year after year, typically blooming in spring or summer. They can be herbaceous, dying back to the ground in winter, or woody, maintaining their structure throughout the year. Evergreen perennials retain their leaves throughout the seasons, providing year-round greenery. Common examples include pine trees and holly bushes. These plants are essential for maintaining biodiversity and can enhance garden aesthetics while requiring less maintenance than annuals.