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Few plants offer the landscaping grace of Japanese irises. Described as "floral butterflies" when in bloom, these perennials also provide strong vertical design elements in the form of straight, upright foliage. If you haven't tried these, consider doing so. Odds are good you'll like them. A lot.
Japanese irises grow best in full sun. In the hottest parts of the country, select a site that enjoys some shade in the afternoon. These plants are among the few perennials that will thrive in soil that is not well drained. Feel free to plant them at the edge of a pond or stream.
Moderately fertile soil to rich humusy soil works well for Japanese irises. If your soil is lean, add some compost, decomposed manure or other enriching amendment prior to planting. Japanese irises also do very well in moist, acidic soils.
Plant Japanese irises outdoors in spring when frost danger has past and soil has warmed. These perennial plants can manage cold temperatures fine when 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 and if they sit in a slight depression this tends to capture water and keep the soil moist. 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 while plants are establishing.
Plant Japanese irises about 10-12” apart.
Japanese irises are heavy feeders and an application of a balanced fertilizer in spring prior to flowering is beneficial. This isn’t necessary the first season, but is a good idea thereafter. You may choose to deadhead (remove spent flowers) to keep the plants looking their best. 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: Plants like moist settings
Uses: Perennial gardens, moist meadows
Tip: Stop to explore the intricate blooms
They Start Out looking Like This:
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