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Siberian irises grow best in full sun. They also grow best in well drained soil; boggy soil will promote root rot. These perennial plants develop into large blooming clumps over a few years so allow a space 15-20" across for your mature irises.
Moderately fertile soil to rich humusy soil works well for Siberian irises. If your soil is lean, add some compost, decomposed manure or other enriching amendment prior to planting. Siberian irises also do well in somewhat acidic soils although this is not a requirement for success.
Plant Siberian irises outdoors in spring when frost danger has past and soil has warmed. These perennial plants can manage cold temperatures once establish, but during their settling in period they need protection from freezing.
Soaking your iris plants in a bucket of water for a few hours or overnight prior to planting helps reduce transplant stress. Do not allow the roots to dry out while transplanting. Plant iris rhizomes 1-2” deep. Refill around plant with soil, tap down to eliminate any big air pockets and water well to settle the soil around the roots. Keep soil moist, but not soggy, while plants are establishing.
Plant Siberian irises 12-18” apart.
Siberian irises benefit from an application of a balanced fertilizer in early spring prior; 10-10-10 is good. A second application after flower helps strengthen plants and sets the stage for strong flowering the following spring. This isn’t necessary the first season, but is a good idea thereafter. Feel free to flowers to enjoy indoors. They aren’t long lasting but their textures, colors and patterns are gorgeous.
Light: Full sun to partial sun
Depth: Plant 2" below soil level
Water: Average, 1" per week
Uses: Perennial gardens, landscaping accents
Tip: Stop to appreciate the intricate blooms
They Start Out looking Like This:
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