Iris cristata (Dwarf Crested Iris)

Iris cristata (Dwarf Crested Iris) is a low-growing perennial forming a quickly spreading mat of narrow, sword-shaped, bright green, pointed leaves. Myriads of small, light violet-blue flowers, up to 1.5 in. across (4 cm), adorned with a conspicuous white splotch and gold crest on each fall, appear in mid-spring, just above the foliage tips in perfect display.

Iris cristata (Dwarf Crested Iris) is a low-growing perennial forming a quickly spreading mat of narrow, sword-shaped, bright green, pointed leaves. Myriads of small, light violet-blue flowers, up to 1.5 in. across (4 cm), adorned with a conspicuous white splotch and gold crest on each fall, appear in mid-spring, just above the foliage tips in perfect display. They carpet the ground and create a spectacular drift of blue color. This rhizomatous perennial is an excellent plant for the shaded rock garden, perennial border, or woodland garden. May also be used as a seasonal ground cover.

  • Grows up to 6-9 in. tall (15-22 cm) and 6-12 in. wide (15-30 cm). Spreads quickly to form dense colonies in satisfactory growing conditions.
  • Performs best in light shade in moist, humus-rich soils. Plants will tolerate some sun if the soil is consistently moist. Blooms well even in dry shade.
  • A welcomed addition to beds and borders, wall-side borders, coastal gardens, city gardens, cottage gardens, rock gardens, or containers.
  • Deer resistant.
  • No serious insect or disease issues but watch for slugs and snails.
  • Remove any dying foliage in autumn, old flower stems can be cut down after flowering.
  • Propagate by division of rhizomes from midsummer to early autumn
  • All parts may cause discomfort if ingested. Wear gloves and other protective equipment when handling.
  • Toxic to dogs, toxic to cats, toxic to horses.
  • Native to the southeastern United States.

Requirements

Hardiness 4
– 10

Heat Zones 1
– 10

Climate Zones 2, 2B, 3, 4, 5, 6
Plant Type Perennials
Plant Family Iris – Other
Exposure Partial Sun
Season of Interest Spring (Mid)
Height 6"
– 9"
(15cm
– 22cm)
Spread 6"
– 1'
(15cm
– 30cm)
Spacing 6″
– 12″
(15cm
– 30cm)
Water Needs Low, Average
Maintenance Low
Soil Type Clay, Loam
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Moisture Retentive, Well-Drained
Characteristics Showy
Native Plants United States, Midwest, Illinois, Indiana, Missouri, Ohio, Northeast, Massachusetts, Maryland, Pennsylvania, Southeast, Alabama, Arkansas, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Southwest, Oklahoma
Tolerance Deer, Drought, Dry Soil
Garden Uses Beds and Borders, Ground Covers, Patio and Containers, Wall-Side Borders
Garden Styles City and Courtyard, Coastal Garden, Gravel and Rock Garden, Informal and Cottage