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To determine if a plant is sufficiently cold-hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
This treasured iris is not invasive in watery areas like its cousin, "Yellow Flag," so it's a perfect wildflower garden plant--as long as you have a wet spot in sun or shade.
A similar, but shorter species occurs farther south and is called "Southern Blue Flag."
As with all irises, growing them from seed is not difficult, but may take some time. The plant must create its bulky roots before it can bloom.
|Common Name||Blue Flag Iris|
|Botanical Name||Iris versicolor|
|Seed Life Cycle||Perennials|
|Light Requirements||Full Sun, Half Sun / Half Shade|
|Mature Height||24-36 inches tall|
|Bloom Time||Late spring|
|Seeds Per Pound||20800|
|Seeds Per Packet||15|
|Soil Moisture||Average, Moist/Wet|
|Soil Type||Sandy Soil, Loamy Soil, Clay Soil, Acidic Soil, Moist/Wet Soil|
|Native To||North America|
|Native To||Northeastern North America|
|Ideal Region||Northeast, Southeast, Midwest, Southwest, West, Pacific Northwest|
|Zones||3, 4, 5, 6, 7, 8|
|Is It Storable?||Yes- You can store your seed in any cool (not freezing) dry place that is not subject to extreme temperature variations.|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||Yes|
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To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
Enter your Zip Code to find your USDA Planting Zone
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