Biennial flowers are plants that complete their life cycle in two years. In the first year, they typically grow leaves, stems, and roots, while storing energy. In the second year, they produce flowers and seeds before dying. Common examples include foxglove and hollyhock. These flowers are often used in gardens for their vibrant blooms and ability to attract pollinators. Biennial flowers can be planted in the fall or spring, and they thrive in well-drained soil with adequate sunlight. Gardeners appreciate them for adding variety and color to landscapes over multiple seasons.