Iris cristata
Iris cristata, commonly called the dwarf crested iris or crested iris, is a small, spreading iris native to eastern North America. It grows from shallow creeping rhizomes and forms low mats with 6–8 slender leaves. In spring it sends up short stems topped by 1–2 fragrant flowers.
Each flower is 3–5 cm across and ranges from lavender to pale blue; white forms can occur. The blooms have three outer petals (falls) with a central white patch and an orange or yellow crest, and three inner petals (standards). A long perianth tube lifts the flower above the foliage. After flowering, a small seed capsule develops.
Habitat and range: Iris cristata grows in oak woodlands, rocky hillsides, ravines, and along streams in calcareous soils across the eastern United States, including parts of the Ozark and Ouachita mountains. It flowers mainly in April and May and tolerates a range of soils but prefers well-drained, neutral to slightly acidic soil rich in organic matter. It is hardy in USDA zones 3–9.
Cultivation and care: Plant the rhizomes about 3–5 cm below the soil surface and mulch lightly. It likes partial shade and regular moisture, and it can naturalize to form large clumps, making it useful as ground cover in woodland borders or rocky areas. Propagation is easiest by division every 3–4 years; seeds can be used but take longer to bloom.
Cultivars and use: There are many cultivars, including white forms like Alba and various blue and purple shades. Popular selections include Shenandoah Sky and Echo Ruffles. Iris cristata attracts bees and is a favorite for shaded and woodland gardens.
Toxicity and safety: All parts are poisonous if eaten and handling can irritate the skin.
Other notes: It is related to Iris lacustris (the dwarf lake iris). Historically, it has been cultivated in temperate regions and also appears in Cherokee traditional medicine.
This page was last edited on 3 February 2026, at 11:59 (CET).