Pseudacorus

Yellow flag iris (Iris pseudacorus) is a robust perennial known for its bright yellow flowers and adaptability to wet conditions. Thriving in pond margins, marshes, and wet meadows, it tolerates standing water and spreads aggressively through rhizomes and seeds. While valued for erosion control and habitat restoration, it requires management in natural areas to prevent excessive spread. Its sword-like foliage remains attractive throughout the season, adding vertical interest to water gardens and riparian landscapes.