Perennial flowers (herbaceous) live year after year; with tops, leaves, stems, and flowers dying back with the first freeze each fall. Spring brings new growth from the roots that persist through the winter. Some varieties are more hardy than others. Most require pruning and maintenance, and in Alaska, deadheading (removing spent flower blooms) to keep them healthy and attractive. Different varieties bloom at different times during the season, thus with careful planning a succession of flower blooms can be achieved. Most require dividing every 2-3 years. By combining perennials and annuals, a continuous colorful show can be provided.