Dutch irises will also naturalize and bloom again the following spring. Some gardeners prefer to treat them as annuals and plant fresh bulbs every fall but if the iris bulbs are happy in a sunny, well-drained spot, they will bloom for many years.
How to Plant Irises. For bare-root irises, plant the rhizome horizontally with the top exposed. In climates with hot summers, plant the rhizome just below the soil surface. Plant rhizomes singly or in groups of three, 1 to 2 feet apart, depending on the size.
Bearded irises are the most common and typically do better in pots. That's because they have thick fleshy roots that grow closer to the soil's surface. They don't need a ton of depth, making them a good candidate for container growing. You can identify bearded Read more
The Oncocyclus irises cannot self pollinate, which makes studying potential pollinators a bit easier. During a 5 year period, researchers noted that male Eucerine bees were the only insects that regularly visited the flowers and only after their visits did the plants set seed.
Irises don't generally cause rhinitis symptoms, either; for a special touch, Stembel recommends rarer varieties of bearded irises. And although bright yellow flowers typically come with a strong scent just by coincidence, she says daffodils are a safe bet.
The blue variety "Wedgewood" (Iris xiphium "Wedgewood") is the familiar florist's iris, forced for year-round availability. Plant bulbs 3 to 4 inches deep and 6 inches apart in USDA zones 6 through 9. Bulbs increase by division and can be dug up and separated every Read more
Bearded Irises Grow from Rhizomes Such plants also spread by rhizomes, and irises are no exception. While some rhizomatous plants, like bamboo, spread rapidly and even invasively, the iris spreads fairly gradually—one of its main virtues for gardeners. But, as iris rhizomes spread, they become Read more
Newly planted iris need moisture to encourage root growth; however, over-watering can encourage rot.
Do not overwater irises; too much moisture in the soil can cause the rhizomes (roots) to rot. Water consistently and deeply, especially during summer drought. If they're covered with soil or crowded by other plants, they'll rot. Irises may benefit from shallow mulching in the Read more
Irises. If you've got a friend who regularly has fresh flowers in a vase, chances are it is at least partially filled with these lovely, ruffled flowers. Although not very toxic, they can cause extreme discomfort in your cat and can result in more serious Read more
Exposure to mold can cause respiratory symptoms and symptoms of an allergic reaction, which include things like itchy eyes, redness of the eyes, and watery eyes. However, more serious issues can occur, including a number of eye infections. Keratitis is an eye infection commonly caused Read more
Iris bulbs are hardy enough to plant outdoors, but you can also plant them in pots that are kept indoors. When iris bulbs are grown indoors, they experience a longer blooming season because you can regulate the temperature. In addition, indoor irises will not be Read more
Iris is a genus of 260–300 species of flowering plants with showy flowers. It takes its name from the Greek word for a rainbow, which is also the name for the Greek goddess of the rainbow, Iris. Some authors state that the name refers to Read more
Iris, like most perennials, prefer neutral to slightly acidic soil (pH of 6.8 to 7.0 is ideal). Heavy clays need to be amended with gypsum or coarse sand to aid drainage.
Such plants also spread by rhizomes, and irises are no exception. While some rhizomatous plants, like bamboo, spread rapidly and even invasively, the iris spreads fairly gradually—one of its main virtues for gardeners. But, as iris rhizomes spread, they become crowded.
They prefer fertile, neutral to slightly acidic soil. Learn more about preparing soil for planting and organic soil amendments. Good drainage all year-long is very important; irises prefer “wet feet, but dry knees.” They will not tolerate wet soil in wintertime.
The tall, beautiful iris, named after the Greek goddess who rode rainbows, comes in many magical colors. Despite its divine origins, this June bloomer is rugged, reliable, and easy to grow.
While you wouldn't want to go planting iris bulbs in winter, if you live in a cold climate, you'll be happy to know that these popular perennial flowers are capable of surviving chilly weather and even frost. Some irises grow from bulbs, and others grow Read more
ANSWER: Irises are very tough and, unless you have borers in the rhizomes, it is okay for them to have some brown leaf tips. We always liked to trim them off below the browning with a sharp scissors or pruner, and at a diagonal.
Soil. Tall bearded Irises like a well-drained soil that is slightly alkaline and high in calcium. Organic matter is helpful. Iris benefit from the addition of compost, but be sure to delay planting for at least two weeks after working the compost into the soil, Read more
Do not overwater irises; too much moisture in the soil can cause the rhizomes (roots) to rot. Water consistently and deeply, especially during summer drought. Unlike bulbs, which thrive deep underground, iris rhizomes need a bit of sun and air to dry them out.
Iris borer caterpillars (Macronoctua onusta) are the most destructive insect pests of iris. The caterpillars chew holes into the leaves and tunnel all the way into the rhizome. The tips of iris leaves turn brown and seem to be dying, but the entire plant dies Read more
Soft rot is caused by bacteria which commonly enter the iris plant through feeding wounds made by iris borer worms. Rotting is often rapid in older beds which are over-crowded, shaded and poorly drained. Dry rot may be caused by one of a half dozen Read more
Iris flowers attract insects and birds and provide nectar to hummingbirds. Home/Good for bees. Iris flowers attract insects and birds and provide nectar to hummingbirds.
Iris root rot is a caused by Erwinia carotovora, a bacterial phytopathogen. With iris root rot, you'll first see yellowing at the center of the fan of leaves. In time, the center turns brown and collapses. Root rot in iris always produces a mushy, bad Read more
Killing iris borers requires a well timed insecticide application. Spinosad is a safe spray that is a bio-insecticide. It should be applied when the iris growth is just 6 to 8 inches (15-20 cm.) high in early spring.
It can be grown outdoors in zones 7 – 11 (gardeners in zone 7 might want to give it a little extra protection in the winter), and gardeners in cooler zones can grow this in a large container quite successfully.
While you wouldn't want to go planting iris bulbs in winter, if you live in a cold climate, you'll be happy to know that these popular perennial flowers are capable of surviving chilly weather and even frost.
All irises grow in temperate climates. They are adapted to the changing seasons. Most kinds have periods of rapid growth in spring and autumn, but slow down or go dormant in summer and winter. In fact, irises need a distinct winter with cold temperatures in Read more
Deadheading, or removing the old flowers, keeps the plants attractive and allows the leaves to collect energy for healthy root formation instead of setting seeds. Some irises may bloom twice a year if you deadhead properly. Break off the individual flowers on each flowering stem Read more
Fertilization. Irises should be fertilized in early spring about 6 to 8 weeks before bloom, and again after the blooms are gone. Because phosphate is important, we recommend bone meal or super-phosphate and a light balanced fertilizer such as 10-10-10 or 6-10-10 depending on the Read more
Soil conditions – Bearded iris need a balanced, well-drained soil but are very adaptable to a variety of soil types. Raised beds can help with drainage and are a MUST for areas with high rainfall. Iris, like most perennials, prefer neutral to slightly acidic soil Read more
The iris (Iris spp.) Most iris varieties feature tall, grasslike leaves, and graceful, spring or summer flowers. These hardy plants have few serious problems, but they occasionally attract feeding insects.
Iris roots can become woody and overgrown unless the clumps are lifted, divided, and replanted every three to four years. Overgrown clumps tend to get barren in the center, with foliage and flower stems that appear only around the outside of the clump.
The fungus causing iris leaf spot is Cladosporium iridis and spreads from diseased to healthy leaves during the summer primarily via splashing water. For this reason, infected leaf tissue should be removed as soon as it is observed.
Iris bulbs should be planted in the fall for spring blooms. For best results, blooms need at least a half day of full sun, but colors will be more vibrant if they receive a full day of direct sunlight. Soil should be well-drained at all Read more
Siberian irises grow well in cool, wet conditions and, though they thrive in full sun, they can also tolerate some shade. Plant about 1 inch deep in full sun to part shade.
Iris, like most perennials, prefer neutral to slightly acidic soil (pH of 6.8 to 7.0 is ideal). Heavy clays need to be amended with gypsum or coarse sand to aid drainage. DO NOT plant bearded iris in a low area; they will not tolerate standing Read more
Most irises flower in early summer. Some—mostly bearded hybrids—are remontant, meaning they flower again later in the summer. Irises attract butterflies and hummingbirds, and make lovely cut flowers.