Herbaceous perennials die back in late autumn and early winter. The roots then survive below ground during winter, shooting again in spring. Well known examples include delphinium, geranium, miscanthus (an ornamental grass) and sedum.
Some perennials are known as evergreens. Evergreens are plants that retain green leaves throughout the year. Some examples of evergreens include most species of conifer such as pine, hemlock and blue spruce. holly, cycads and eucalyptus are also evergreen perennials.