Plant · P-1171

Blue Flag Iris

Iris versicolor

Blue Flag Iris is a rhizomatous perennial of marshes, pond margins and wet meadows, grown for its blue to violet flowers from May into August and for the way an established clump's root mass holds a shoreline together. It spreads slowly, by both rhizome and self-sown seed, and tolerates standing water up to about 15 cm as well as brief full submergence. Every part of the plant is toxic to people and livestock, so it belongs well away from stock and poultry despite a long history of use as a fibre and dye plant.