Harlequin Blue Flag Iris is a striking native iris with blue-violet flowers marked with yellow and white patterns. It grows naturally in wetlands, marshes, shorelines, and wet meadows. It can tolerate average garden conditions if watered regularly. Its upright foliage adds structure even when not flowering. You can divided it every few years if the clumps become crowded. It can tolerate seasonal flooding. Avoid planting in dry, sandy locations.