Iris versicolor (Blue-Flag Iris)

A genuinely versatile wetland perennial, blue flag iris tolerates both full submergence and brackish water, delivering a strikingly showy bloom that draws hummingbirds and bumblebees alike - while its toxic, starch-rich rhizomes are avoided by deer entirely.

Species Overview

Iris versicolor, or blue flag iris, is an upright, native perennial wildflower typically found near wetlands, on creek or pond margins, or in any wet, low-lying area. Reaching a height of up to three feet, it forms clumps of bright green, grass-like foliage that produces striking blue-purple blooms with yellow accents in late spring and early summer.

Application

• Wetland restoration - tolerates full submergence and brackish water
• Pond-edge, streambank, and rain garden plantings
• Deer-pressured sites
• Pollinator and hummingbird habitat

Growing Conditions / Specification Data

• Light: Full Sun to Part Shade
• Soil/Moisture Tolerance: Wet, moist, clay or mucky soils; tolerates brackish water and short periods of drought
• Plant Type: Forb
• Mature Height: 2-4 ft.
• Fall Color: Insignificant/None
• Bloom Color / Period: Blue; May-June
• Wetland Indicator Status: OBL (Obligate Wetland)
• Native Range: Eastern North America
• Hydrology: Wet
• Root Depth: Shallow (Under 12 in.)
• Growth Rate: Moderate
• Drought Tolerance: Low
• Shade Tolerance: Intermediate
• Salinity Tolerance: Moderate - tolerates moderately brackish water
• Flood Tolerance: High - A classic wet-site perennial listed alongside confirmed wetland obligates; tolerates saturated to standing water, consistent with this species' already-confirmed brackish-water tolerance from earlier salinity research.
• Growth Habit: Clumping/Mounding
• USDA Hardiness Zones: 3-8
• Deer Resistance: Yes (Rarely Damaged)
• Pollinator Value: Supports bees, supports hummingbirds

Planting Guidance

• Spreads by self-seeding and rhizome extension once established; not a demanding plant despite its wetland preferences.