Iris versicolor (Blue flag)

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Skill rating Beginner
skill rating
Ultimate spread 0.4m
max. spread
Ultimate height 1m
max. height
Time to maturity 2-5 years
to maturity
Maintenance level 1 hour care
per year
Toxic - Ingestion may cause severe discomfort. This plant
is toxic!

Botanical name: Iris versicolor

Other names: Harlequin blueflag, Blue flag, Larer blue flag, American water iris


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Genus: Iris

Species: I. versicolor - I. versicolor is a herbaceous perennial for a pond margin or marsh area. It has clumps of slender, green, strap leaves and voilet-blue flowers with white markings that bloom in spring until summer.

Iris versicolor is: Deciduous

Flower: White, Violet, Blue in Spring; Blue, White, Violet in Summer

Foliage: Mid-green in Spring; Mid-green in Summer

Habit: Compact, Erect

Toxicity: Ingestion may cause severe discomfort.

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Watch out for

Specific pests: Slugs , Snails

Diseases: Generally disease-free.

General care

Propagation methods: Division, Seed. REGISTER to read more...


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Iris versicolor (Blue flag) will reach a height of 1m and a spread of 0.4m after 2-5 years.


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Suggested uses: Cottage/Informal, Flower Arranging, Beds and borders, Wallside and trellises, Coastal, City

Cultivation: Plant in moist soil up to 20 cm of water. Will not tolerate drying-out.

Suitable for your garden?
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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Match unknown
Soil drainage: Boggy damp conditions, Pond/In water, Moisture-retentive Match unknown
Soil pH: Alkaline, Neutral Match unknown
Light: Full Sun Match unknown
Aspect: South, East, West Match unknown
Exposure: Exposed, Sheltered Match unknown
Hardiness: Hardy (H4) Match unknown

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