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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.
Printer Friendly Version (PDF). Verbenas are long blooming annual or perennial flowers that possess the virtues of heat tolerance and an extremely long bloom season. Many perennial verbenas are relatively short lived, but their vigor and heavy flowering make up for this defect.They do well grown as annual flowering plants also, since they bloom quickly during the first season after planting. âHomestead Purpleâ Verbena (Glandularia canadensis), known for its long bloom season.railing Verbena (Glandularia canadensis; formerly Verbena canadensis): Trailing verbena is a native perennial throughout South Carolina. The plants have a low spreading form and will flower profusely all summer.