Siberian Irises (AKA Siberian Flag) is the collective name commonly used for a group of 'beardless' Irises found naturally in Turkey, Italy, Russia, China and the Himalayas. There are approximately 10 species in the group and most modern hybrids grown in gardens today are a cross between Iris sibirica and Iris sanguinea. In ancient times parts of these Irises were used in herbal recipes as a cure for ulcers and to alleviate women's problems - whatever that means! Today they are highly desirable, elegant and easy to grow rhizomatous herbaceous perennials.
Siberian Irises are generally happy in full sun as long as they have ample summer moisture. If your garden is very hot they will be grateful for afternoon shade. They will grow happily along stream or pond margins as they are water loving but don't immerse them in water - leave that for the Louisiana Irises. Their preference is for soil that is mildly acidic therefore it is best to avoid Lime. New clumps should be planted with the roots and the top of the rhizomes completely covered. They may take a season or 2 to settle down but once they are happy and in full flower in mid to late spring you will be so pleased you planted them. The narrow, green, grass like foliage forms a strong vertical clump and the flowers (butterflies) are carried on the top of long slender stems. The colour range includes crisp whites, bold blues, and darkest purples. In more recent times pinks and pale yellows have also become available.
Siberian Irises are deciduous and will appear to be completely dormant in winter. The foliage turns brown before dying down and can be removed any time after late autumn. Take care not to damage the little green pointed shoots that will be nestled at the bottom of the clump when doing your tidy up. In spring give the clumps a nice layer of mulch and some general fertilizer but other than they are best left undisturbed. If you do eventually want to divide the clumps do so in early spring, ensure your divisions are of a generous size and keep them well watered until well established. Enjoy!
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