Rocky mountain iris (Iris missouriensis)

Rocky mountain iris

Also known as: Missouri flag

Rocky mountain iris (Iris missouriensis) is a perennial plant native to western and central North America. It blooms from spring to summer with large purple blossoms that rise above the plant on leafless stems. Petals have yellow patches that provide a striking contrast. Flowers usually grow in pairs but spring bloom individually or in groups of 3 or 4. Thrives in full sun and moist well-drained soil.

Scientific classification

Species

Rocky mountain iris (Iris missouriensis)

Instantly identify plants with a snap

Snap a photo for instant plant ID, gaining quick insights on disease prevention, treatment, toxicity, care, uses, and symbolism, etc.

Download the App for Free

Toxic to Pets

Toxicity

Perennial

Lifespan

Herb

Plant Type

Late spring, Summer

Bloom Time

20 cm to 40 cm

Plant Height

1 m

Spread

Green, Blue

Leaf Color

6 cm to 7 cm

Flower Size

Blue, Purple

Flower Color

Green, Purple, Blue

Stem Color

Deciduous

Leaf type

0 - 32 ℃

Ideal Temperature

Images of Rocky mountain iris

Attributes of Rocky mountain iris

Growth Rate

During the summer, rocky mountain iris experiences a rapid rate of growth resulting in swift vertical growth, dense leaf formation, and prompt blooming. Its accelerated development manifests in taller stems, flourishing foliage, and expedited floral displays. However, the growth rate may vary in other seasons.

Care Guide for Rocky mountain iris

Every week

Water

Full sun

Sunlight

0 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Originating from moist meadows, rocky mountain iris thrives in high humidity and prefers consistent moisture, requiring weekly watering. It adapts well to outdoor settings, benefiting from natural rainfall and cooler climates, particularly in shaded gardens that enhance moisture retention.

Fertilize: For optimal growth of rocky mountain iris, use balanced fertilizers with high phosphorus content during the growing season. Fertilize once in early spring and mid-summer if needed. Avoid over-fertilizing to prevent nutrient burn. Dilute fertilizer to half-strength and taper off as dormancy approaches.

Pruning: Rocky mountain iris grows best in well-drained soils and features vibrant blue-purple flowers. Prune in early to late spring, removing dead foliage and spent stalks to boost blooming. Avoid excessive leaf cutting, and use clean tools for effective pruning, enhancing air circulation and reducing disease risk.

Propagation: Rocky mountain iris is easy to propagate through division, maintaining genetic consistency and promoting new growth. Successful separation occurs during dormancy, using a sharp tool. Proper care with regular watering and well-draining soil aids in establishment and healthy development of new specimens.

Get tips and tricks for your plants.

Keep your plants happy and healthy with our guide to watering, lighting, feeding and more.

Download the App for Free

Images of Rocky mountain iris

Attributes of Rocky mountain iris

Care Guide for Rocky mountain iris

PEOPLE ALSO ASK

Common Pests & Diseases