Always avoid transplanting irises in wet weather because you can spread the disease. As the plants did well for a number of years, the first two items likely don’t apply – unless there are other plants nearby that have grown tall enough to hog the sunlight (irises need at least 6 hours of sunlight a day). It is also important to note that leaf spot does not permanently affect the plant’s rhizome. They can even flower on and off throughout the year! In addition to that if you heavy soil it is said to give the bulbs a break. In My … Also, help answer other questions about General Gardening and Japanese Iris Plants, and plants at GardeningKnowHow.com Pretty disappointing show in my garden this year. Problem #1: Planting Your Bearded Iris Too Deep. Use a fertilizer with a … My Iris' get great green leaves but I fail to get a bud, which in turn I don't get a bloom? Hot, humid weather seems to stress reblooming irises … and not in the right way. 2) They also won't bloom if they're planted too deep, or 3) they receive too much nitrogen from a fertilizer combination high in nitrogen. Maybe your irises did not bloom because they got too little (or too much) water last year. Too much nitrogen can also be a problem. About 10 years ago I planted some Siberian iris plants around a whiskey barrel fountain on the north side of my house. I read that from time to time you need to dig them out and split the bulbs as they have created daughter bulbs and all the energy is going into them instead of the flowering. This is one of the most common reasons for How to Plant Bearded Iris not to grow in size or to produce the big, fabulous blooms they're known for. (Answer) The usual reasons that irises might not bloom are not enough sun, wrong planting depth or overcrowding. Since this is the 1st year I've had so few flowers I'm not sure where to begin, to improve blooming for next year. Ask the Expert: Why wont my Iris bloom? Here are a few simple reasons why your daylilies may not be showering you with their floral display: They may need to be in an area that has more sunlight. Bearded iris are propagated and planted as rhizomes.. Rhizomes are sideways-growing stems that shoot out laterally, just beneath the surface of the soil. I did it it this year and tripled my irises like that. Bacterial Soft Rot I know in most areas bearded Iris need the rhizome top exposed but have always planted mine with the top of the rhizome just under the surface because it gets so hot in summer. Help answer a question about Why aren't my Japanese irises not blooming - Gardening Know How Questions & Answers. 4. It does generally offer a two-year cycle and will have an adverse effect on blooming the following year but the plant should be fine the year after. 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