Alphabetical Plant Listing

Iris versicolor 'Whodunit' (Blue Flag)

Blue Flag 'Whodunit', Boston Iris 'Whodunit', Liver Lily 'Whodunit', North American Blue Flag 'Whodunit', Purple Iris 'Whodunit', Snake Lily 'Whodunit', Wild Iris 'Whodunit', Harlequin Blueflag 'Whodunit'


Iris versicolor 'Whodunit' (Blue Flag) is a rhizomatous perennial forming a clump of narrow, upright, sword-shaped, blue-green leaves. Branched stems rise from the clump in late spring to early summer, each of them boasting 3-5 violet-blue flowers adorned with bold purple veining and mostly white falls. Very handsome in and out of bloom, Blue Flag is a central landscape plant for the water garden, near ponds and streams. This marginal aquatic plant is also a lovely addition to moist borders.

  • Grows up to 24-30 in. tall (60-75 cm) and 18-24 in. wide (45-60 cm). Clumps will spread steadily over time to form colonies.
  • Performs best in full sun or part shade, in acidic, moist to wet, humus-rich soils. This iris may be grown in up to 2-4 in. (5-10 cm) of shallow standing water.
  • A welcomed addition to beds and borders, cottage gardens, near streams or ponds, where it will provide excellent color contrast.
  • Propagate by division from mid-summer to early autumn.
  • Virtually disease free. Keep an eye out for sawflies. Deer resistant.
  • Ingestion may cause severe discomfort.

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Requirements

Hardiness 3 – 7
Heat Zones 1 – 9
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Perennials
Plant Family Iris - Other
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early)
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" – 24" (45cm – 60cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Showy
Tolerance Deer, Wet Soil
Garden Uses Beds and Borders, Ponds and Streams
Garden Styles Informal and Cottage, Prairie and Meadow

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While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 7
Heat Zones 1 – 9
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Perennials
Plant Family Iris - Other
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early)
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" – 24" (45cm – 60cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Showy
Tolerance Deer, Wet Soil
Garden Uses Beds and Borders, Ponds and Streams
Garden Styles Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Iris - Other

Guides with Iris - Other

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