Roof Iris Iridaceae:
An easy to grow Iris that foirms clumps with attractive sword- shaped leaves in fans and violot-blue flowers. Grows 14 to 18 inches tall. Best grown in rich organic soils that are moisture retentive but not wet. Plant in full sun to part shade. Over time the rhizomes tend to push out of the ground, so every few years dig and plant or in fall or spring apply an organic mulch.