Iris missouriensis: Rocky Mountain Iris with Blue-Veined Flowers

Iris missouriensis (Rocky Mountain iris) is a variable beardless iris with narrow leaves to 20 inches long, bearing 2–4 blooms on each branched stem in summer. 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: 1–3 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