Iris versicolor has a deep blue to purple, rarely white flower. The spreading sepals have purple veins as they gradually narrow to a white base, with a pubescent, greenish yellow signal. Northern blue flag iris flowers in late spring on a compact two to four flowered inflorescence. The bluish-green leaves are wide arching, up to four feet long and arise from shallowly rooted, large, branching rhizomes forming clumps.

Pot Size (gallons), Height: #2