Siberian iris (Iris sibirica) are low-maintenance perennials with elegant blooms and grasslike foliage. Find the best variety of siberian iris for your yard and garden, and learn how to grow and care for this beautiful plant.
Siberian Iris Facts and Info
Siberian iris grow in Zones 3-9 and will reach heights of 18-48”h x 24” w. They grow fairly fast and have an upright form with a medium texture. This gorgeous perennial iris prefers full sun and moderately fertile, well-drained soil.
The Elegant flowers are beardless with blue-hued petals that are held above the foliage in early summer. Fall petals are dark-veined and marked with white or gold. The leaves are narrow and grasslike. This low-maintenance perennial is trouble free, long-lived, and attractive throughout the growing season. Plant in odd-numbered groups in the middle or back of the perennial border, or in containers. Good companions include false indigo and ‘Biokovo’ cranesbill.
Siberian Iris Care
Plant 18”-24” apart in fall or early. Apply slow release granular plant food at the time of planting. When the soil feels dry 2” below the surface, water the plant deeply. Apply 3” of vegetative mulch in summer and winter to reduce weed seed germination, to retain soil moisture, and to keep the soil temperatures stable. Trim plants to the ground in late fall after frost disfigures the foliage.
In moderately fertile soil plants may be divided every 3 years to maintain vigor. In rich soils division is needed sooner to maintain vigor and to control growth dig around the root clump and lift. Use a sharp spade to slice through the root system.
The larger the portion, the larger the resulting plant during the first year. Smaller pieces may take 2-3 years to reach mature size and bloom. Reset portions that contain healthy roots and top shoots. Discard any pieces that do not contain both healthy roots and top shoots. Water deeply and apply 3” of vegetative mulch around the plants.
Siberian Iris Varieties
Iris sibirica ‘Alba’ bears white flowers.
‘Ann Dasch’ has dark blue flowers with yellow on the fall.
‘Butter and Sugar’ bears white-and-yellow flowers.
‘Caesar’s Brother’ has deep purple flowers.
‘Ego’ bears brilliant blue flowers.
‘Ewen’ has burgundy blooms.
‘Papillon’ has light blue flowers,
‘Wisley White’ has white flowers with a yellow splash on the falls.
Sweet iris (I. pallida) reaches 2-4’ high and bears soft blue flowers with a yellow beard in early summer. Leaves are gray-green and sometimes evergreen. The rhizomes are powdered or dried in pea-size chunks to use as a fixative (holds scents for a long time) for potpourri.
Yellow flag iris (I. pseudacorus) prefers moist, even wet soils. Flowers are yellow with a deeper yellow splash on each fall. The leaves are gray- green.
Reticulated iris ( I. reticulata) has a bulb instead of rhizomes, and reaches 4-6” high. It produces fragrant purple-and-gold blooms in late winter or early spring.
Dutch Iris (I. Xiphium hybrids) bear blue or violet or occasionally white, yellow, or mauve flowers in spring and early summer. They are hardy to Zone 5.