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Japanese Iris Culture
Japanese Irises will grow successfully in ordinary conditions where rhododendrons, azaleas or blueberries thrive. They require ample moisture, especially up to bloom time. They do very well beside a stream or pond, but in cold climates they do not like to have their feet in water during winter. Good culture will increase height, branching, flower size and quality of bloom. Japanese irises will grow and bloom better if planted in full sun, but appreciate afternoon shade in hotter climates. Soil Requirements:Japanese irises prefer a heavy, rich soil, with ample organic matter. If the soil is clay, the addition of organic matter will help to loosen it; if the soil is more sandy, the organic matter will help in water retention as well as adding nutrients. Depending on what is available, tile in an amount of cow manure, hay, straw, pet moss etc. If using hay or straw you may need to add high nitrogen to compensate for the nitrogen tied up in the decomposition process. The soil PH should be slightly acid, ideally between 5.5 to 6.5. Planting: Japanese Irises can be transplanted almost anytime from spring until fall, when roots are in active growth. In colder climates earlier summer planting is preferred to give new roots sufficient time to anchor the plant before winter freezes set in. Newly received plants should be soaked in water overnight before planting. The roots should at not time be allowed to dry out during transplanting. Plant 2 to 3 inches deep and about 2 feet apart in a depression of 3-4 inches. This helps to catch and hold moisture for the new roots that form above the old roots. Caution: DO NOT USE BONE MEAL. This has the same effect as lime and can kill Japanese irises. Do not fertilize newly planted or transplanted Japanese irises as this can burn the roots. After planting, keep well watered until the plant is established. Mulching and fertilizing: After planting, a heavy mulch of 2-3 inches will help conserve moisture, hold down the weeds, and help prevent heaving in fall if planted late. Oat straw, rotted sawdust, pine needles etc. is fine. Japanese irises are heavy feeders. A liberal application of balanced fertilizer such as 12-12-12 in spring and just before bloom is beneficial. Pests: Bait if damage is seen of slugs and snails. Thrips are very tiny and hide in the folds of the leaves. Use a systemic following manufactures instruction (Cygon 2E, Orthene, etc). |
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