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A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
HG 20 Introduction to Herbaceous Perennials. Perennials are plants that live year after year. This means the tops of the plants die back to the ground each fall with the first freeze. Every spring, new plant tops arise from the crown or roots, which persisted through the winter. Perennials are said to be hardy because they live through the winter.