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www.wikihow.com/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 usually be easily corrected, including allowing your irises more space to grow, giving them the sunshine they need, feeding them to help them bloom.

homeguides.sfgate.com/irises-bloom-40651.html

How to Get Irises to Bloom. A large genus of flowers, irises (Iris spp.) include the beloved bearded iris and other flowering beauties such as Siberian and Louisiana irises. Most varieties are ...

www.gardeningknowhow.com/ornamental/bulbs/iris/iris-plants-not-flowering.htm

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.

www.almanac.com/plant/irises

Irises will bloom best in full sun. They can tolerate as little as half a day of sun, but it’s not ideal. Without enough light, they won’t bloom. Bearded irises must not be shaded out by other plants; many do best in a special bed on their own. They prefer fertile, neutral to slightly acidic soil.

www.bhg.com/gardening/flowers/perennials/how-to-grow-reblooming-irises

Reblooming irises grow faster than regular irises, so you'll need to divide them more often. To prevent overcrowding, divide reblooming iris every two to three years, but take only the outside rhizomes of the plant; leave the healthy older portions of the plant intact.

www.hometalk.com/39127621/q-how-to-get-irises-to-bloom

Overcrowding can cause them not to bloom. Iris should be divided every several years. I would recommend digging them up if they are crowded in and divide them and space them apart with about 6 rhizomes in each grouping. When planting make sure the rhizomes are just barely beneath the soil level. Planting too deep is also a cause of non blooming.

www.wikihow.com/Grow-Iris

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.

www.bhg.com/.../flowers/perennials/how-to-grow-maintain-and-divide-bearded-iris

Bearded irises are among the most elegant and colorful perennials you can grow. With a little know-how, you can grace your garden with long-lasting, ever-multiplying blooms for years to come. It's a magical time when bearded iris flowers unfurl their pencil-slim buds to reveal a kaleidoscope of color, beginning as early as March in warmer regions.

homeguides.sfgate.com/way-cut-irises-bouquet-95984.html

The Best Way to Cut Irises for a Bouquet. With their frilly look and often fancy coloring, irises (Iris spp.) are often additions to bouquets. Depending on the species, irises are hardy in U.S ...