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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.
Thatâs because some of them are annual plants and some are perennial plants. Annual plants are plants with a life cycle that lasts only one year. They grow from seed, bloom, produce seeds and die in one growing season.They then need to be replanted each spring. Most annuals bloom for a long time. They provide beautiful colors from spring through fall and are popular with flower gardeners.he term  perennial  refers to herbaceous (âgreenâ) plants since woody plants, such as trees, are perennial by definition. Unlike annuals, perennials tend to bloom for just a short time â one to three weeks â each year. Examples of popular perennial flowers include tulips, asters, black-eyed susans and lilies.