🌱
Image coming soon
Growing Inspiration
Inspiration for future Agardeni growing environments.
ornamentalFamily: IridaceaeGenus: Iris
Cultivar
Blue Flag Iris
Iris
This classic native perennial produces attractive, sword-shaped, bluish-green foliage that adds vertical interest to the garden throughout the season. In late spring, it bears iconic violet-blue blossoms with delicate yellow and white throats. Thriving in consistently moist to wet soil conditions, this iris is perfect for challenging, damp areas of the landscape where other plants may struggle. It is a reliable, low-maintenance choice for gardeners looking to support local pollinators while adding a touch of sophisticated natural beauty.
Blue Flag Iris is a striking moisture-loving perennial known for its elegant, violet-blue, veined flowers that bloom in late spring and early summer. It is an excellent choice for naturalizing in boggy areas, rain gardens, or along the edges of ponds.
Marketplace packs coming soon
Current nursery inventory and 18 / 36 / 72 pricing will appear here when available.
Cultivar Story
Start with Inspiration. Grow Your Aspiration.
📦
Image coming soon
Marketplace Plant
A realistic representation of the starter plants offered in 18, 36, and 72 plant quantities.
🌿
Image coming soon
Aspirational Garden
Grow your aspirational plan into an inspirational garden.
🍓
Image coming soon
Plant Detail
A closer look at the fruit, flower, foliage, or mature defining characteristics of this cultivar.
🪴
Image coming soon
Repotting / Start Growing
Begin with a starter plant and establish it in a larger pot using quality potting soil with beneficials and fertilizer.
✨
Image coming soon
Start · Plan · Grow
Start with real plants. Plan with current marketplace availability. Grow your aspirational garden.
Cultivar Video
Agardeni▶
Cultivar Video Coming Soon
See this cultivar from starter plant to aspirational garden.
Plant Profile
Grow Blue Flag Iris with confidence
Key growing information first, with the complete reviewed cultivar profile available when you want it.
☀️
Sun
Full sun to partial shade.
💧
Water
Keep consistently moist to wet. This plant is well-suited for sites with poor drainage or naturally damp soil.
📏
Mature size
24 to 36 inches tall and 18 to 24 inches wide.
🌡️
Hardiness
3-9
🌿
Growth habit
Clumping perennial.
🌿
Plant type
perennial
View Plant Data
Care, size, flowering, climate, soil, health, and additional reviewed data.
+
View Plant Data
Care, size, flowering, climate, soil, health, and additional reviewed data.
Good to know
🌱
Growing note
Thrives best in consistently moist environments. While it tolerates standard garden soil, it performs exceptionally well in areas with higher moisture, such as the banks of water features or rain gardens.
🌡️
Climate note
Very cold hardy; foliage will die back in winter in colder climates, returning in early spring.
🌸
Flower / fruit
Produces violet-blue flowers with distinctive yellow-white center markings in late spring to early summer.
Growing & Care
Everyday care, growth, feeding, and pruning guidance.
+
Growing & Care
Everyday care, growth, feeding, and pruning guidance.
☀️
Sun / light
Full sun to partial shade.
🌿
Growth rate
Moderate.
🌱
Fertilizer
Apply a balanced, slow-release, granular fertilizer in early spring as new growth emerges.
✂️
Pruning
Remove spent flower stalks after blooming to improve appearance. Cut back foliage to the ground in late autumn or early spring after it yellows.
•
Care notes
Thrives best in consistently moist environments. While it tolerates standard garden soil, it performs exceptionally well in areas with higher moisture, such as the banks of water features or rain gardens.
Size & Habit
How the plant grows and the space it needs at maturity.
+
Size & Habit
How the plant grows and the space it needs at maturity.
📏
Mature size
24 to 36 inches tall and 18 to 24 inches wide.
🌿
Growth habit
Clumping perennial.
↔️
Spacing
18 to 24 inches apart.
Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
+
Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
🌸
Flowering / fruiting
Produces violet-blue flowers with distinctive yellow-white center markings in late spring to early summer.
Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
+
Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
🌡️
Hardiness zones
3-9
🌡️
Temperature
Very cold hardy; foliage will die back in winter in colder climates, returning in early spring.
Soil & Water
Moisture, drainage, soil, and pH preferences.
+
Soil & Water
Moisture, drainage, soil, and pH preferences.
💧
Watering
Keep consistently moist to wet. This plant is well-suited for sites with poor drainage or naturally damp soil.
🌱
Soil
Prefers rich, organic, moist to wet soil. Tolerates heavy, clay-based substrates common in wetland areas.
🧪
Soil pH
5.5-7.5
More Plant Data
19 additional reviewed fields from this Plant.id.
+
More Plant Data
19 additional reviewed fields from this Plant.id.
•
Container Growing
Suitable for containers if kept very well-watered. Use a heavy, moisture-retentive potting mix and place in a location where the soil can remain consistently damp.
•
Family
Iridaceae
•
Foliage Look
Upright, narrow, grass-like, deep green sword-shaped blades.
•
Foliage Rules
Leaves are narrow, flat, and sword-shaped; no broad or rounded foliage.
🍒
Fruit Flower Look
Striking violet-blue flowers with intricate, darker vein patterns and yellow-white highlights on the falls.
🍒
Fruit Flower Rules
Flowers are characteristic iris shape with three drooping sepals and three upright petals; flowers should not appear on immature starter plugs.
✂️
Growth Habit Rules
Should maintain an upright, clumping habit; avoid images showing cascading or spreading vines.
•
Mature Plant Look
A dense clump of vertical, blade-like leaves with tall, elegant, violet-blue iris flowers appearing in late spring.
🌱
Mature Stage Morphology
Robust, upright, sword-shaped leaves forming a dense clump with long, sturdy floral stems rising above the foliage.
🌱
Morphology Rules
Preserve the elegant, vertical structure of the foliage and the architectural nature of the flower stems.
•
Plant Faqs
Does Blue Flag Iris need a lot of water? Yes, it thrives in wet or consistently moist soils and is perfect for boggy spots or pond edges. How tall does it grow? Mature plants typically reach between 24 and 36 inches in height. Can it be grown in a standard garden bed? Yes, as long as the soil is kept evenly moist throughout the growing season.
•
Root Look
Fibrous, healthy, white to light brown roots contained within a compact plug.
🌱
Soil Look
Dark, damp, rich, organic, slightly heavy substrate.
•
Starter Stage
Small, grass-like green foliage emerging from a root plug.
🌱
Starter Stage Morphology
Narrow, upright, sword-shaped leaves with a smooth texture and light green color.
•
Video Voiceover Script
Welcome to Agardeni, where inspiration for gardening helps us imagine how and where we will grow Blue Flag Iris. This is Blue Flag Iris, available as 18, 36, and 72 plant starter trays through the Agardeni Marketplace. Let this striking perennial become part of your aspirational plan, helping you imagine the future rain garden or water feature you want to create. Focus your attention on those iconic violet-blue blossoms, featuring intricate vein patterns and bright yellow throats that signal the arrival of summer. Establish your starter by repotting the plug into a four-inch pot with a quality, well-draining mix, then move it later to your final moist garden location when established. Find your inspiration with Agardeni. Explore real plants and real availability. Start. Plan. Grow.
•
Youtube Tags
Iris Blue Flag Iris Iris versicolor Perennial Water Garden Rain Garden Native Plant Moisture Loving Gardening Tips Agardeni
•
Youtube Video Summary
Discover the beauty of the Blue Flag Iris, a resilient and stunning perennial perfect for damp garden spaces. Learn how to grow this moisture-loving classic to enhance your landscape with its vibrant spring blooms.
•
Youtube Video Title
Growing Blue Flag Iris: The Elegant Wetland Perennial
Coming Soon
Future Buyer Brand Sellers
Possible future seller options for 2.5-inch, 4-inch, and 1-gallon finished plants.