The various species of beardless iris include: Iris sibirica, Iris cristata, Iris ensata, Iris versicolor or Louisiana irises. The Louisiana irises are hybrids of Iris brevicaulis, Iris, fulva and Iris giganticaerulea.
Beardless irises have a wide range of tolerance for shadier places with moister soil. These irises are a great idea for water or rain gardens. Gardeners who prefer to use natives in the United States have several choices, as well. Most beardless irises dislike being dug and divided very often, helping to put them in the low maintenance plant category.
Iris cristata is a native from the southern part of the United States. This dwarf iris looks good in a rock garden or where early spring color would be noticed. Crested iris prefers part shade and a moist well draining soil.
Iris ensata is an excellent choice for surrounding water gardens. Japanese iris is an early summer blooming type. They like full sun to a part shade exposure. This iris does not like a high pH so remember to amend the soil thoroughly with organic mulch. Japanese iris does not like to be dug and divided very often.
If a gardener is looking for another type of iris to use with bearded iris this one is it. Iris sibirica enjoys full sun and moist well draining soil but will tolerate a dry soil. This iris is a perennial with multi-season interest; blooming in late spring, developing seed pods that last into winter and leaves continuing with fall color. Siberian iris would make a good plant for a rain garden.
Iris versicolor is a native found in the United State and Canada, hardy to zone 2. It is an excellent plant for bogs, ponds or lakeshore.
Louisiana iris is a native plant. They need moist soil and full sun but especially in warmer climates, like afternoon shade. Louisiana irises are excellent for water gardens although will grow in traditional garden beds.
Beardless iris is a great perennial plant. They lack the insect and disease issues of bearded iris. The beardless iris is a good choice for novice perennial plant gardeners.