![]() It is critical to transplant every 3 to 4 years. New roots form above the old roots each year forcing the crown up and out of the soil. Dig and divide your plants every 3 to 4 years to maintain plant vigor. Japanese iris can be transplanted almost anytime from spring until fall if you keep the plant wet, and the temperatures are below 90 F and above 32 F for a month afterwards. Do not apply fertilizers to new transplants. Most soils with heavy watering will usually need more nitrogen applied. Depending on your soil a liberal application of balanced fertilizer for acid loving plants (Rhododendron, Camellia) in the spring just before or after bloom is beneficial. In hot climate, some afternoon shade will benefit the bloom. These plants like full sun, with a minimum of 6 hours to bloom properly. Variegated Japanese Water Iris Iris ensata 'Variegata' Pronunciation: EYE-riss en-SA-tuh var-ee-GAY-tuh SKU 04401 USDA Zone 4-8 Your climate might be too cold for this plant: Change Location Buy Online Find In Store Add To Wishlist OVERVIEW DETAILS STYLE CARE Care Provide organically rich, humusy, acidic, moisture retentive soil. The crown of the plant needs to be above the water line. They do very well near water, as this is where they naturally grow, or where the water table is high. Wet in the spring and keep moist all summer. Constant moisture will reward you with healthy plants and larger blooms. Also, do not fertilize newly planted or transplanted Japanese iris as this can burn the roots. Do not use bone meal or lime, as this will raise the soil pH too much and can kill Japanese irises. The soil pH should be slightly acid, ideally between 5.5 to 6.5. An addition of well aged manure and compost will help in water retention as well as adding nutrients. Japanese irises prefer a rich, loose soil with ample organic matter. Expect your best bloom on 2 and 3 year old plants. The roots produce a substance in soil that ultimately inhibits the plant’s growth, as well as the growth of other iris species. New transplants may not bloom the first year. Japanese iris have one characteristic that is somewhat unusual. Depending on your soils and weather a daily watering may be needed for the first week or two. They form large lavish clumps and are highly decorative, blooming in late summer. Japanese Irises are some of the most popular Irises, and are usually planted in spring. Water in well to start the root development, do not let new transplant dry out. Although related to native North American irises, this species is native to Asia and is highly prized in Japan where it has been cultivated for hundreds of years. Give a good 18 to 24 inch spacing between different rhizomes. Plant individual rhizomes 2-3 inches deep, 6 to 8 inches apart. Newly received plants that are bare root should be soaked in cool water for a few hours or overnight. ![]() Demanding in their needs but if met they will reward you with tall robust plants and larger blooms. Perhaps no other iris is as influenced by good culture as Japanese iris, properly known as Iris ensata.
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