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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. The term is also widely used to distinguish plants with little or no woody growth from trees and shrubs, which are also technically perennials.erennial plants can be short-lived (only a few years) or they can be long-lived, as are some woody plants like trees. They include a wide assortment of plant groups from ferns and liverworts to the highly diverse flowering plants like orchids and grasses.
Living for three or more years. Noun. A perennial plant. Asters, irises, and peonies are some examples of perennials. - First meant remaining leafy throughout the year; plants living three or more yearsâdying aboveground and sending up fresh growth every yearâare perennials.erennial. adjective continual, lasting, continuing, permanent, constant, enduring, chronic, persistent, abiding, lifelong, perpetual, recurrent, never-ending, incessant, unchanging, inveterate the perennial urban problems of drugs and homelessness. adjective.