blue flag
Also known as: Boston iris; liver lily; North American blue flag; particoloured iris; purple iris; snake lily; wild iris
I. versicolor is a rhizomatous perennial to 80cm in height, with narrow, erect foliage and branched stems bearing several bluish-purple flowers 6-8cm in width, the falls with a conspicuously veined white basal patch
Scientific classification
- Species
- blue flag (Iris versicolor)
- Genus
- Iris
- Family
- Iridaceae
- Harmful if eaten. Wear gloves and other protective equipment when handling
- Toxicity
- Aquatic · Bogs · Herbaceous Perennial
- Plant type
- 0.5-1 metres
- Height
- 0.1-0.5 metres
- Spread
- Deciduous
- Foliage
- Clump forming
- Habit
- Spring · Summer · Autumn
- Season of interest
- Full sun
- Sunlight
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- Ideal temperature
blue flag pictures
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Distribution of blue flag
Distribution map
Northern America
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Culture
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Toxicity
Harmful if eaten. Wear gloves and other protective equipment when handling
Quick identification of blue flag
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blue flag care guide
- Keep root zone evenly moist through growth without stagnant water
- Watering
- Full sun
- Sunlight
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- Ideal temperature
Watering
Keep root zone evenly moist through growth without stagnant water
Fertilizing
FertilizingBalanced iris feed every three weeks in active spring and summer growth
Pruning
PruningNo pruning required
Propagation
PropagationPropagate by division from mid-summer to early autumn
Growing
GrowingGrow in moist to wet deep, humus-rich, acid soil in full sun
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Common pests and diseases
Diseases
May be susceptible to aphid-borne viruses, bacterial soft rot and grey moulds; see Iris diseases
Pests
May be susceptible to slugs, snails and thrips
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