Northern Blue Flag is an iris that grows well in moist to wet areas of your yard. A great choice for a rain garden or to allow to naturalize in a wet area in your yard. Showy blooms.
Pollinator Type
Butterflies, flies
Plant Type
Herbaceous perennial
Zone
3 to 9
Height
2-3 ft
Spread
1-2 ft
Light
Partial Shade, Full Sun
Moisture Requirement
Medium Soil, Wet Soil
Bloom Color
Purple, Blue
Bloom Time
May, June, July
Design Considerations
Prefers soil with a constant source of moisture. Great choice for low regions of rain gardens. Will spread over time to form a colony.
Care and Maintenance
Can cut foliage back in the fall. May need to be divided over time.
Pest and Diseases
Pests found on iris plants include iris borer and thrips. Diseases like rot and leaf spot.
Establishment and Propagation
Division is best. Be aware that the rhizomes are poisonous, so take proper precautions when handling.
Commercial Availability
Sometimes available.
Alternative Plant Selections
Southern Blue Flag, Crested Iris, Copper Iris
Native Status
Illinois native, northern Illinois.
Fall Color
Insignificant
Growth habit
Herbaceous perennial that will spread over time through rhizomes to form colonies.
Number of Caterpillars that Use this as a Host Plant
