Native to Europe, Yellow flag iris is recommended for growth in USDA hardiness zones 5 to 9. It thrives in full sun to partial shade but they bloom best in full sun. Since this plant prefers wet conditions, it is best to plant it where the soil is acidic and excessively moist. Yellow flag iris is often found near ponds, marshes or in wet meadows when found growing in the wild.
Yellow flag iris can be used to brighten up any area of your yard. It typically reaches heights of 3 to 5 feet and has a spread of 2 to 2.5 feet. This perennial blooms during the months of May and June. The blooms it produces are especially lovely and cheerful. Each bloom is bright yellow with a brownish-purple veining inside each flower. This plant is also a great choice if you have wildlife such as deer wandering throughout your yard, as it is resistant to this kind of damage. Another great thing about Yellow flag iris is that it is fairly low maintenance and easy to care for.
This plant makes a lovely addition to a water garden because it thrives in standing water. It also makes a lovely border plant or looks beautiful planted in clusters near patios, decks and porches. Yellow flag iris is tolerant of drought conditions, so it also works well in areas that receive little rainfall.