Most irises grow from thick, underground stems or rhizomes. A few species are bulbous. An iris flower typically consists of six segments. The three inner segments, which are generally upright, are referred to as standards. The drooping, outer three segments are known as falls.
Bearded irises are one of the most popular and widely grown perennials in the home landscape.
Though not as widely grown, several other types or species of iris also are attractive additions to the perennial garden. By selecting and planting several different iris species, gardeners can enjoy blooming irises from April through July. Bearded irises are available in a wide range of colors, including white, yellow, orange, pink, wine-red, blue and purple. The flowers of many varieties possess various combinations or blends of these colors. Bearded irises bloom in early to late spring.