Biennial flowers are plants that complete their life cycle in two years. In the first year, they typically grow foliage and establish roots, while in the second year, they produce flowers, set seeds, and then die. This unique growth pattern allows biennials to offer a variety of blooms, colors, and textures, adding interest to gardens and landscapes. With proper planning, they can provide continuous color and beauty year after year. Popular biennial flowers include foxglove, hollyhock, and sweet William.