- Name: Blue Flag Iris - Other Common Names: Harlequin Blueflag / Fleur-De-Lis / Shreve's Iris / Northern Blue Flag - Scientific Name: Iris Versicolor - Color: Mixed Colors - Plant Seeds: Fall / Cold Stratify / Indoors Before Last Frost / Outdoors After Danger Of Frost - Bloom Time: May - June - Hardiness Zone: 1 - 9 - Plant Height: 24 - 36" - Plant Spacing: 15 - 18" - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Moist - Quantity: 25 Seeds - Other:The Blue Flag Iris Is Fragrant & Attracts Butterflies. The Large Colorful Flowers Are Stunning And It Also Boasts Attractive Foliage. This Iris Tolerates Drought Well Or Can Be Grown In Wet Areas, So It Can Be Grown Anywhere! This Iris Is Native To The Us & Canada, & Is Extremely Cold Hardy.