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Siberian Irises typically bloom during late May and into June in colors ranging from white to shades of blue and purple.
They are very durable and extremely hardy plants.
Siberian Iris Plants quickly form large clumps of 2-4 ft., deciduous, grass-like foliage.
Clusters containing 2-5 blooms emerge on stems that may reach 5 ft. tall!
Growing Requirements for Siberian Iris Plants
Siberian Irises are hardy in USDA zones 4-9 and should be grown in full sun except in very hot climates where they will require some light shading.
They will tolerate a wide range of soil conditions, but prefer a rich, well draining acid soil (pH 5.5 to 6.9).
Siberian Iris rhizomes should be planted 1-2 feet apart in early spring or late summer in clod weather regions. Plant them in late fall in mild climates.
They should be planted slightly deeper than other types of Iris, covering the rhizomes with one to two inches of soil.
Water regularly and thoroughly once new growth begins in the spring.
Continue this watering schedule until a month or so after your Irises have finished blooming.
Siberian Irises should be fed with a good, all-purpose fertilizer in early Spring and then again immediately after they have finished blooming.
In the Fall, cut the foliage back close to the ground after it dies back.
To ensure a quality show of blooms, Siberian Iris should be divided every 3-4 years.
Propagating Siberian Iris Plants
Siberian Iris plants can be propagated by dividing established clumps at a time that coincides with the proper planting time for your area.
Seeds of non-hybrid varieties of Iris siberica can be sown directly into the garden where they are to grow, in late fall.