Blue Flag Iris
Iris versicolor
Blue Flag Iris is a stunning native wetland perennial with violet-blue flowers adorned with intricate purple veining. This hardy iris naturalizes beautifully along pond edges, streams, and rain gardens.
Iridaceae (Iris family)
Late spring to early summer (May-July), blooming for 2-3 weeks
Symbolism & Meanings
Key Meanings
Perfect For
Color Meanings
Cultural Significance
Blue Flag Iris is the provincial flower of Quebec, Canada, where it's called "Iris versicolore." The fleur-de-lis symbol is thought to resemble the iris flower with its three petals. The name "versicolor" means "having various colors," referring to the multicolored blooms. "Flag" comes from Middle English "flagge" meaning rush or reed, referencing its wetland habitat. Through history, iris flowers have symbolized power, with the three parts representing wisdom, faith, and courage. Native to North American wetlands, it represents the beauty and ecological importance of these vital ecosystems.Shop Our Floral Collection
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Physical Characteristics
Natural Habitat
Growing Guide
Sunlight
Full sun to partial shade; best flowering in full sun
Water
Medium to wet; thrives in consistently moist to wet soil; can tolerate 2-4 inches of standing water; tolerates complete submergence
Soil
Moist, Wet, Humus-rich, Clay, Acidic (pH <6.8), Organic-rich
Expert Growing Tips
Plant rhizomes just below soil surface or in shallow water
Can be planted in containers and submerged up to 4 inches deep
Divide clumps every 3-4 years after flowering for vigor
Wear gloves when handling rhizomes (can cause skin irritation)
Trim foliage back to 1 inch above crown after fall frost
Spreads slowly by rhizomes and self-seeding
Deer and rabbit resistant due to toxic compounds
Provides habitat for aquatic insects and attracts hummingbirds
Tolerates moderate salt in rain gardens
Uses & Benefits
Ornamental Uses
- Pond edges and margins
- Bog gardens and wetland plantings
- Rain gardens and bioswales
- Water gardens and aquatic features
- Stream bank stabilization
- Native plant gardens
- Naturalized areas and meadows
- Containers submerged in water features
Traditional Uses
- Historically used by Native American tribes as liver and kidney detoxicant, dermatological aid, and pain reliever
- Potawatomi tribe wove leaves into mats and baskets
- Dried roots contain oleoresinous compounds (iridin) used in herbal medicine
- IMPORTANT: Rhizomes are poisonous if not prepared properly; modern use should be avoided
- Can cause nausea, vomiting, and diarrhea if ingested
Disclaimer: Information provided is for educational purposes only. Consult healthcare professionals before using any plant medicinally.
Further Reading
Frequently Asked Questions about the Blue Flag Iris
is blue flag iris invasive?
No, Blue Flag Iris (Iris versicolor) is native to North America and is not invasive. It spreads slowly by rhizomes and self-seeding. Don't confuse it with Yellow Flag Iris (Iris pseudacorus), which is invasive in many regions.
can blue flag iris grow in standing water?
Yes, Blue Flag Iris can grow in 2-4 inches of standing water and tolerates complete submersion. It's a true marginal aquatic plant perfect for pond edges, bog gardens, and rain gardens with consistent moisture.
is blue flag iris toxic?
Yes, all parts of Blue Flag Iris are toxic, especially the rhizomes which contain irisin/iridin. Ingestion causes nausea, vomiting, and diarrhea. Handling can cause skin irritation. Keep away from pets and children.
how do you tell blue flag iris from yellow flag iris?
Blue Flag (Iris versicolor) has violet-blue flowers with yellow markings, grows 24-30 inches tall, and is native. Yellow Flag (I. pseudacorus) has all-yellow flowers, grows taller (3-5 feet), and is an invasive non-native species.
Available Colors
Quick Facts
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