Blue Flag Iris (Iris versicolor)

 

Blue Flag Iris (Iris versicolor) 

Blue flag iris is a native perennial that stands two to three feet tall, rising in loose clumps along the wet edges of ponds, lakes, marshes, and slow streams. By early summer its blue‑to‑violet flowers open wide—often up to four inches across—each one slightly drooping, with yellow and white striping that fans outward from the center like a landing guide for bees. Bumble bees and syrphid flies are the most frequent visitors, following those color cues straight to the pollen‑bearing surfaces. The plant’s leaves are narrow, upright, and grass‑like, anywhere from eight to 32 inches long, and they emerge in fans from a thick rhizome buried in saturated soil. Each leaf is distinctly heart‑indented where it clasps the stem, a small structural detail that helps shed water and keep the leaf blade rigid. In wet sun or shade, blue flag iris becomes part of the stabilizing architecture of a shoreline—slowing erosion, filtering runoff, and offering cover for frogs, dragonfly nymphs, and the insects that feed them.

Sources:

USDA Forest Service – Iris versicolor (Blue Flag Iris)

Minnesota Wildflowers – Blue Flag Iris (Iris versicolor)

Illinois Wildflowers – Blue Flag Iris

Lady Bird Johnson Wildflower Center – Iris versicolor

Wisconsin DNR – Native Wetland Plants: Blue Flag Iris

Missouri Botanical Garden – Iris versicolor: Ecology and Identification

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