Blue flag is a native perennial plant with delicate violet flowers that bloom in spring.
Blue flag has violet-blue flowers with delicate, arching petals that gradually narrow toward the center of the flower. Its petals have purple veins and a white and yellow base. Flowers bloom May to June. Its leaves are long and grass-like. Blue flag grows to 3 feet tall.
Found in wetlands, marshes, swamps, wet meadows, shorelines, stream banks and other wet areas. Grows in full to partial sun.
Grows throughout most of the Chesapeake Bay watershed, except in West Virginia.
After blooming, flowers mature into a greenish-brown seed capsule. Seed capsules eventually split open, allowing seeds to scatter. Blue flag also reproduces asexually when underground rhizomes spread.