Types of Iris Flowers: A Complete Guide

Iris flowers are common in U.S. gardens. The genus Iris contains over 200 species of long-lived perennials in many colors, shapes, and sizes, adaptable to a wide range of conditions. The four principal types are bearded, beardless, crested, and bulbous—each with distinct characteristics.

Bearded Iris

Characterized by fuzzy "beards" on the falls (lower petals). Three upright petals (standards), three falls with a fuzzy strip. Colors: white, yellow, pink, purple, blue, multicolor. Thousands of cultivars. Classified by height: miniature dwarf to tall (8–38 inches). Sword-shaped leaves, evergreen in warm climates. Drought and cold tolerant—ideal for beginners.

Beardless Iris

Smooth falls, thinner grass-like leaves. Colors: white, yellow, pink, purple, blue, maroon. Common cultivars: Siberian, Japanese, Spuria, Louisiana, Pacific Coast Native. Height 1–5 feet. Bloom mid-summer after bearded types. Love moist soil—ideal for water gardens. Grown from thick rhizomes, tolerating damp conditions. Less susceptible to pests/diseases, can bloom in partial shade.

Crested Iris

Raised serrated ridge (crest) on falls instead of beard. Crest color contrasts with petals. Grown from rhizomes, related to bearded irises. Tolerate more shade than bearded types. Common: Iris cristata, a dwarf American native with lavender flowers and yellow crests.

Bulbous Iris

Grown from bulbs, not rhizomes. Planted in fall, dormant in summer (bulbs can be lifted and stored). Small, dainty, orchid-like flowers. Common types: English, Dutch, Spanish iris.

Understanding these types helps you choose the best iris for your garden conditions.