Iris tenuis, commonly known as Clackamas iris, is a rhizomatous perennial herb native to the Pacific Northwest of the United States, specifically Oregon. It is found in moist meadows, grassy slopes, and open woodlands, often in areas with seasonal wetness. This species typically grows to 12-18 inches (30-45 cm) in height and features narrow, pale to dark green basal leaves that are deciduous. The Clackamas iris blooms from late spring to early summer, producing delicate flowers that range in color from white to pale blue or lilac, each with a distinctive yellow or golden, low dissected crest that adds to its ornamental value.

The Clackamas iris is appreciated for its graceful form and the subtle beauty of its flowers, which can add a touch of elegance to woodland gardens, borders, and naturalized areas. It is cold hardy and suitable for cultivation in USDA Zones 6 to 9. Gardeners value this species for its preference for humus-rich, well-drained soils and its tolerance for mildly acidic to neutral pH levels. While it can handle sun or partial shade, it does require some sunlight to produce flowers. The plant has average water needs, preferring consistent moisture during the growing season, but it is not tolerant of heat or dry conditions. When planting, space individuals 7–15 cm (3–6 in) apart to allow for proper growth and airflow, which can help prevent disease.CC BY-SA 4.0