Rocky Mountain iris (Iris missouriensis) Synonyms:  Iris tolmeiana Genus:  Iris This variable, beardless iris with narrow leaves to 20 inches long bears 2 to 4 blooms on each branched stem, in summer. The flowers have short, pale to deep blue or lilac-purple standards and larger falls with deep purple veining. Care:  Grow in medium-wet, average soil. Propagation:  Lift and divide clumps, or separate bulb offsets, and plant immediately, in early autumn. Problems:  Iris borer, verbena bud moth, whiteflies, iris weevil, thrips, slugs and snails, aphids, and nematodes.

Overview

Height 1 ft. to 3 ft. Growth Pace Invasive/Aggressive Grower Light Full Sun to Part Shade Moisture Medium to Wet Maintenance Moderate Characteristics Native, Showy Flowers Bloom Time Summer Flower Color Blue, Purple Uses Beds and Borders, Waterside Style Water Garden Seasonal Interest Summer Interest Type Perennials