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Native Plant of the Week: Blue Flag Iris

Updated: Mar 8, 2022

Family: Iridaceae

Name: Iris versicolor - Blue Flag Iris

Bloom Time: June

Flowers: Purple, Lavender, Violet

Soil Condition: Average-wet, acidic, rich

Light: Sun to Partial Shade

Height: 24-36" tall by 24-36" wide

Native Range: Northeastern North America including Long Island

Zone: 2 to 7

Iris versicolor is a true low maintenance plant and can handle average garden soil as well as being submerged in a pond. Rhizomes are toxic and may cause a rash if touched without gloves. Blue Flag Iris spreads by seeds and rhizomes. A great plant for revegetating along streams and ponds as it filters excess nutrients to improve the water quality.

Maintenance: After the fall frost the foliage may be cut back to about 1" above the crown, watch for Iris borer and rhizome rot.

Benefits: pollinators including hummingbirds and bumble bees, birds will eat the seeds, deer and rabbit resistant

Companion Plants: Rhexia virginica - Meadow Sweet, Asclepias incarnata - Swamp Milkweed, Eupatorium perfoliatum - Boneset, Lythrum alatum - Winged Loosestrife, Symphyothricum novae-angliae - New England Aster, Carex brevior - Short-beaked Sedge

pics: KMS Native Plants LLC



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