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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.
Biennial are plants whose lifecycle spans two years, so they flower and produce seeds in their second year. A familiar biennial is foxglove, Digitalis purpurea. Some plants grown as biennials are, botanically speaking, short-lived perennials, for example, sweet william and wallflower.ardy annuals are plants that go through their entire life cycle in one season and that can be sown outside in the open garden in spring where it is to flower, for example, Centaurea cyanus â cornflower.