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How to Get Irises to Bloom. Irises (Iris spp.) come in a variety of sizes, shapes, flower colors and blooming season. If you have irises that are more than one year old and they are not blooming, there are a few possible causes which can...


Irises (Iris spp.) flower in early to midsummer, producing multiple blooms on each stalk. They grow in U.S. Department of Agriculture plant hardiness zones 3 through 9, depending on the variety. Irises usually bloom with no help from you, but problems with the growing site or overcrowding can reduce flowering.


Irises are one of the easiest flowers to grow. They stem from rhizomes, which quickly multiply over the years, producing bigger, wider stands of these appealing blooms. When you notice iris plants not flowering, the cause can stem from a variety of issues including weather, soil fertility, overcrowding, unhealthy rhizomes, insect or disease attack, planting depth and even site conditions.


2. Improve sunlight conditions. Irises often do not bloom because they are growing in too much shade. Most varieties need at least six hours of sunlight a day to bloom.


Despite its divine origins, it is hardy, reliable, and easy to grow. Irises also attract butterflies and hummingbirds and make lovely cut flowers. There are some 300 species in the genus Iris. The most familiar irises are the tall (at least 28 inches) bearded irises (Iris germanica).


How to Divide Bearded Iris. Bearded iris produce leaves, flower stems, and roots from a thick, rootlike structure called a rhizome. As the plant matures, the rhizome produces more rhizomes, which in turn lead to more leaves and flowers.Over time, however, the original rhizome withers and dies off.


When Nick and I moved into our home, one of the first gardening tasks I learned was how to grow Iris. I didn't set out looking to grow it. I had found it planted in various spots around our yard and actually thought it was just a grass. Then, I got one bloom. Seriously people this stuff was everywhere and out of the huge patches, each at least the size of a large kiddie pool, I had ONE BLOOM.


Irises are perfect for beginner gardeners and experienced green thumbs alike! The hardy flowers are not difficult to grow and do well in a wide range of climates, being relatively drought-tolerant and low maintenance. When it blooms, the Iris's flowers are gorgeous, ranging in hue from the common purple shade to patterned white and yellow.


You are here: Home / Plant Care Questions / Iris Refuses To Bloom – A Deep Resentment. Iris Refuses To Bloom – A Deep Resentment. May 6, 2008 by Jamie Jamison Adams 53 Comments. Ask the Expert: Why wont my Iris bloom? My Iris’ get great green leaves but I fail to get a bud, which in turn I don’t get a bloom?