Iris hollandica, commonly known as Dutch iris, is a bulbous perennial that belongs to the Iridaceae family. Native to the eastern Mediterranean region, Dutch iris is now widely cultivated in many parts of the world, including Europe, the United States, and Australia. It is popular for its showy, brightly colored flowers that bloom in the late spring to early summer.

Dutch iris is a hardy plant that can tolerate cold temperatures and is suitable for growing in USDA hardiness zones 6 to 9. It prefers well-drained, fertile soil that is rich in organic matter. Plant the bulbs in the fall season, around 4 to 6 inches (10-15 cm) deep, with a spacing of 4 to 6 inches between bulbs.

Dutch iris produces long, sturdy stems that can grow up to 24 inches (60 cm) in height. Each stem bears a single flower that is about 4 to 5 inches (10-12 cm) wide, with six petals that are arranged in an upright position. The petals come in a range of colors, including blue, purple, white, yellow, and bi-colored varieties. 

The foliage of Dutch irises is narrow and grass-like. The leaves are green in color and form a clump of basal growth at the base of the stem. After the flowers have bloomed, the plant goes dormant, and the foliage dies back. The bulbs remain dormant in the soil during the winter months, and new growth emerges in the spring season.

Dutch iris is a versatile plant that can be used in a variety of landscape settings. It is a popular cut flower, and the long stems make it ideal for floral arrangements. It can also be grown in containers, borders, or as a mass planting for a colorful display. Dutch iris is also suitable for naturalizing in meadows or as part of a wildflower garden.

In summary, Dutch iris is a hardy and reliable perennial that produces stunning, colorful flowers in the late spring to early summer season. It is easy to grow and care for, making it a popular choice for both home gardeners and commercial growers. With its range of colors and versatile landscape uses, Dutch iris is a great addition to any garden or floral display.