Annual flowers are plants that complete their life cycle in one growing season. They germinate from seeds, grow, bloom, and produce seeds, all within a year. These flowers are popular in gardens and landscapes because they provide vibrant colors and continuous blooms throughout the growing season. Common examples of annual flowers include petunias, marigolds, and zinnias. Gardeners often choose annuals for their ability to fill in spaces quickly and create a lively atmosphere. Since they die off after one season, they need to be replanted each year, allowing for new varieties and designs in the garden.