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54 Shocking Facts About When To Plant Iris Bulb | How to grow border irises

  • In our zone 5 here, irises need to planted by the end of July ( August 10 at the latest), to get optimum root development before a hard frost, (around Sept. 25 here in Colorado). Planting on time increases the chance of blooming next spring. - Source: Internet
  • Do not ever cut leaves back in the fall. Brown leaves will help protect rhizomes in winter and they also catch much needed moisture. Clear out all dead leaves and debris from iris beds in early spring and dispose of it. Completely disposing of leaf trash will reduce rot and leaf spot substantially. - Source: Internet
  • Next, plant the iris rhizomes in the selected location. This location should receive a good deal of sunlight and should be well draining. Dig a hole where the rhizome will settle into the ground just below the ground level. If planting several iris near each other, point the rhizomes away from each other and space them 18 inches (46 cm.) apart. - Source: Internet
  • A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. Because Iris thrives here I leave at least 12 inches so the new Iris can grow and increase. Increasing means making new rhizomes or bulbs you can divide out later for more Iris. - Source: Internet
  • Not only good for Sunday dinner, lasagna (planting) is great for bulbs. The idea is to plant bulbs with different sizes and staggered bloom times in layers for a continual bloom. This works great in large containers that are deep and wide enough. Here’s a sample plan, working from the bottom up in a container: - Source: Internet
  • Iris clumps need to be divided about every 4 years. The best time to divide them is at the end of July or first week of August. Trim the leaves to about 6 inches, fan shaped, on the rhizomes you wish to keep, air dry them overnight, and plant them as quickly as you can. - Source: Internet
  • Strangely enough, Dutch Iris flowers have never grown wild in Holland! Rather, the dutch iris varieties are a result of clever hybridization by Dutch growers. Popular flowers with florists, dutch iris grow in a pretty array of colors, some with exotic markings, and the flowers are well known for their long vase life. This is the complete guide to growing irisis. - Source: Internet
  • The summer-flowering bearded irises or flag irises are probably the most popular and best known – with their large, bold flowers and evergreen, sword-like leaves – but there are also some fabulous bulb irises. Many of these flower in late winter and spring – making them essential garden plants. There are even irises for growing in ponds, around ponds and in bog gardens. - Source: Internet
  • Iris should be planted so the tops of the rhizomes are exposed and the roots are spread out facing downward in the soil. In very light soils or in extremely hot climates, covering the rhizome with 1 inch of soil may be desirable. Firm the soil around each rhizome and then water to help settle the soil. A common mistake is to plant Bearded Iris too deeply. - Source: Internet
  • Newly planted bearded irises need watering to help them establish. After that, they rarely need to be watered except in extremely hot, dry summers. It is always better to underwater than overwater, as too much water can induce rot. - Source: Internet
  • The most serious bearded Iris pest is the iris borer, which is usually a problem confined to gardens east of the Rockies. The eggs overwinter on iris leaves and hatch in spring, tunneling into the leaves and eventually burrowing to the rhizome. The leaves of infected plants have yellow streaks and detach easily from the rhizome. The rhizome may be mushy or have small holes from burrowing larvae. - Source: Internet
  • Iris are usually shipped from growers in August and September in the U.S. and that is for a very good reason. The best time to plant iris is in late summer through early fall - Source: Internet
  • Spring bulbs: In warmer climates bulbs that require chilling can be dug up and stored until pre-chilling time the following fall. For colder climates, they can stay in the ground. Many will multiply and return year after year. - Source: Internet
  • Iris need at least a half day of sun. In extremely hot climates, some shade is beneficial, but in most climates Iris do best with at least 6 hours a day of full sun. Without sufficient sun, the iris may “go blind” - producing foliage but no blossoms. - Source: Internet
  • Among the bulb irises, the most popular is the ‘Reticulata’ group, short plants that flower from late winter. They are excellent rock garden plants and for growing at the front of borders and beds. They can also be grown as indoor pot plants – planting 6 bulbs in a 12.5-15cm (5-6in) pot – and will flower in mid to late winter. - Source: Internet
  • Irises need to be planted in well-drained soils. If your soil has a lot of clay content, till in sand until your iris bed comprises of a 50/50 clay sand mix. We feel that using mulches, compost, or manure of any kind contribute rot and weed seeds and is very detrimental to the iris plant. We have a neutral PH in our soil here which is okay for iris. - Source: Internet
  • Select a planting site that receives full sun and has well-draining soil. Bearded irises will not thrive in heavy, waterlogged soils and excessive moisture can result in rot and disease. Iris rhizomes should be planted at or just barely below the surface of the soil. After planting, you should still be able to see the very top of the rhizome. - Source: Internet
  • Although bearded irises have a short vase life, there are a few tricks to help extend their beauty inside the home. Like all cut flowers, it’s important to harvest irises in the early morning, or late evening and place the stems immediately into clean water. Since irises are easily bruised, they should be harvested in “pencil stage” when the blooms are still closed but the color is evident. Irises harvested in pencil stage will open 24-48 hours later and will have a vase life of approximately 3 days. Depending on their intended use, you can remove lower flowers as they fade allowing the blooms higher on the stem to open in the vase. - Source: Internet
  • Learn more about bearded irises by watching our video on How to Plant and Divide Bearded Iris. You may also want to read our article All About Bearded Iris. Shop our complete selection of bearded irises HERE. - Source: Internet
  • The first sign that your iris needs to be divided will be decreased blooming. Overcrowded iris rhizomes will produce fewer flowers than uncrowded iris rhizomes. If you have noticed that your iris are blooming less than they usually do, you may need to transplant the iris in your garden. - Source: Internet
  • Before dividing bearded iris, cut back the foliage to one-third its original height. Dig the clumps and separate healthy new rhizomes from the older, less-productive rhizomes toward the center of the clump. Discard any rhizomes with holes (from insect damage, see Iris Borer, below) or soft spots. Cut the new rhizomes so each has at least one set (fan) of leaves. Plant them as described above, leaving 12-18 inches between rhizomes. - Source: Internet
  • Iris are generally planted 12 to 24 inches apart. Close planting gives an immediate effect, but closely planted Iris will need to be thinned often. Plants spaced further apart will need less frequent thinning. - Source: Internet
  • Zones 4 to 7: In colder climates, spring-flowering bulbs can be planted as soon as the ground is cool, evening temperatures average 40° to 50°F, and it is at least 6 to 8 weeks before the ground freezes. If timed right, this should be as soon as possible after purchase. However, bulbs can be stored in the refrigerator if needed until planting. (See Helpful Hints below for more information on storing bulbs in the refrigerator.) - Source: Internet
  • Cover rhizomes with one inch of soil where the white-green division line on the rhizome is. Plant about 24 inches apart and give them an inch of water the first time, then 1/2 to 3/4 inches of water per week until new growth appears. After the iris are established, apply 1/2 inch of water per week till mid to late September. Deep watering at larger intervals is better than frequent shallow moisture. - Source: Internet
  • Rhizomes are thicker, longer and fleshier-looking and grow just at the soil surface. Bearded irises and water irises often grow from rhizomes. They spread over time and can be divided every few years to increase your blooms and keep the plants healthy. - Source: Internet
  • This is the mistake many make. Iris likes to be close to the surface. I leave a bit of the top showing when I plant, that way I know they are not too deep. - Source: Internet
  • As long as you ensure that your bulbs have good drainage and sunlight, you can plant them just about anywhere. Drainage is critical to keep bulbs from rotting. They like loamy or slightly sandy soil because it provides the drainage and nutrients they need. - Source: Internet
  • There are literally hundreds of different varieties of bearded irises in a wide range of flower colours and heights. These range from Dwarf Bearded, growing 15-25cm (6-10in) high to Tall Bearded, growing up to 1.2m (4ft) high. - Source: Internet
  • Bulbs are little packets of flower power that make us wait weeks, sometimes months, for results — but boy, are they worth it. The term “bulb” often refers not only to true bulbs, but also plants with tuberous roots, tubers, corms, and rhizomes; the information here can be applied to all of these. With a little basic knowledge, anyone can grow beautiful bulbs. - Source: Internet
  • The late-May garden wouldn’t be complete without a stand of bearded irises dancing in the breeze. Their rich, velvety petals, intoxicating fragrance, and cascading beards make my gardener heart swoon. But it’s not only the appearance or fragrance of these flowers that makes me love them. Rather, it’s knowing the “who” behind each bloom that keeps me coming back for more. - Source: Internet
  • Winter, spring and summer flowering varieties make it possible to enjoy irises in your garden from February until August. Choose from miniature alpine irises for pots, rockeries and borders or go for tall, bold and brightly coloured flowers with distinctive ‘beards’ (i.e. cute fluffy tufts on their lower petals). - Source: Internet
  • For best results, Iris should be planted in July, August or September. It’s imperative that the roots of newly planted Iris be well-established before the growing season ends. In areas with hot summers and mild winters, September or October planting may be preferred. We strongly suggest Iris be planted at least six weeks before the first hard frost in your area. - Source: Internet
  • Dwarf Irises (I. reticulata and I. danfordiae): These irises grow from bulbs planted in fall. They produce 6-inch-tall, blue, yellow or purple flowers in early spring in zones 4 to 9. Over the years, these bulbs will naturalize into nice clumps of bloom; just be sure to plant them in a well-drained location. - Source: Internet
  • Iris bulbs are small and onion-shaped. They usually produce small to medium-sized blooms which are ideal for pots and spring displays. These chirpy fellas are perennials and will grow back each year. - Source: Internet
  • Bearded iris spacing should be based on your desired display, and how often you want to divide the rhizomes. Irises planted 24″ apart will gradually fill the space and not need to be divided for many years. Irises planted 12″ apart will provide an abundant flower show more quickly but will need to be divided sooner. - Source: Internet
  • Zones 8 to 10: In warmer climates, spring-flowering bulbs will need to be chilled in the refrigerator for 6 to 10 weeks (depending on the bulb) until the ground cools enough for planting. (See Helpful Hints below for more information on storing bulbs in the refrigerator.) - Source: Internet
  • Once the iris rhizomes have been divided, you can replant them. First, trim all of the iris leaf fans back to about 6 to 9 inches tall (15-23 cm.). This will allow the plant to re-establish its roots without having to support a large amount of foliage at the same time. - Source: Internet
  • Full sun is best, but irises will still bloom with half days of direct sunlight. Do not plant irises in waterlogged areas. Rebloomers can be planted as a group, make sure they are same variety in each group. - Source: Internet
  • The most important rule to remember when you get your irises is to plant them immediately when you receive them. If you have to wait a few days, keep them spread out in your house in a cool, dry place. Never put the rhizomes in a refrigerator. If rhizomes are kept out of the ground 7 days or more, the chances of survival are dramatically reduced. - Source: Internet
  • For all bulbs, after blooming, cut only the flower stem back. Leave foliage intact until it turns yellow and wilts to the ground; the leaves are gathering and storing energy for next year. If the foliage is cut back too soon, bulbs may not perform well—or at all—the following year. - Source: Internet
  • Start by digging out a bearded iris clump and placing it on a tarp for dividing. Next, gently separate the healthy new rhizomes from the older, less-productive rhizomes located at the center of the clump. Discard any rhizomes with holes or soft spots and throw away the oldest part of the plant which will be less vigorous than fresh, new sections. Then, use scissors to cut the foliage back to one-third of its original height. Replant only the healthiest, most vigorous rhizomes with 3 to 4 leaves, allowing about 12″ of space between the clumps. - Source: Internet
  • Check all of the divided iris rhizomes for iris borers and disease. The iris rhizomes should be firm and not soft. If the rhizome feels soft, throw it away. - Source: Internet
  • The small, teardrop-shaped bulbs of Dutch irises are planted in the same way as tulips. Plant from September through December, before the soil freezes. Choose a sunny position with well-drained soil and plant the bulbs in groups, with the pointed tips of the bulbs about 3" - 4" below the soil surface and each bulb about 2" - 4" apart. Dutch irises will perennialize but many gardeners treat them as annuals, discarding the old plants and planting fresh bulbs each season. - Source: Internet
  • The next sign that you should consider transplanting your iris is if the rhizomes start heaving out of the ground. Overcrowded iris rhizomes will start to push on each other, which results in the entire root system of your iris plants literally pushing themselves out of the ground. The iris roots may look like a mass of snakes or a pile of spaghetti when they need to be divided. They may even stop putting up foliage and the plants may only grow foliage on the outside edges of the clump. - Source: Internet
  • Summer bulbs: Also called tender bulbs, these bulbs are planted in spring and flower or leaf out in summer. Gladiolus, lilies, caladiums, and elephant ears are common examples of summer bulbs. Some will bloom later in summer or for a longer time, like dahlias that bloom into fall. (See more: Summer Bulbs.) - Source: Internet
  • Yet some folks prefer to add fertilizer when they plant. If so then stir the fertilizer into the soil, mixing it in lightly. Don’t just place it in the hole. - Source: Internet
  • Bearded irises are grown from rhizomes that sit on top of the soil surface. These plants originate from areas with very hot summers and very cold winters which makes them exceptionally hardy garden plants. When planting, it’s important not to bury the entire rhizome. Instead, leave the top of the rhizome exposed so it can become sunbaked. When planted in the proper location and at the correct depth bearded irises can live for generations. - Source: Internet
  • Healthy iris plants may become crowded and need dividing after 3 to 4 years. A decrease in blooms usually indicates that it is time to divide. Divide bearded irises in summer, roughly two months after blooming. Other irises are best moved in early spring or fall. - Source: Internet
  • Spring bulbs: Also called hardy bulbs, these bulbs are planted in fall, spend winter in the ground, and flower in spring. Some of the more common spring bulbs are tulips, irises, daffodils, hyacinth, allium and crocus. These bulbs need several weeks of cold temperatures to break their dormancy and flower to their full potential. (See more: Spring Bulbs.) - Source: Internet
  • The rich blue blooms of dwarf irises bring a welcome flash of color to the garden in early spring; they are ideal for naturalizing under trees and shrubs and also look fabulous grown in pots and containers. Plant in fall, setting each bulb 4” below the surface of the ground. Dwarf irises look best in groups, planted at a density of 6 bulbs per square foot. - Source: Internet
  • The next step in dividing iris plants is to divide the iris rhizomes. Each iris rhizome should be divided into pieces that are 3 to 4 inches long (8-10 cm.) and have at least one fan of leaves on the rhizome. Do not remove the roots from the rhizomes. - Source: Internet
  • It seems that every gardener has an origin story to accompany their bearded irises. Perhaps they inherited a box of canary yellow iris from a neighbor, traded rhizomes with a fellow garden enthusiast, or snagged unmarked divisions from a roadside stand. Whatever the case may be, I think gardeners love bearded irises not just for their ruffly blooms, but for the stories the flowers carry, and the memories of loved ones that live on through their petals. - Source: Internet
  • To control iris borer, foliage and debris around the plants should be removed in the fall. Discard any infected rhizomes when dividing. Remove and destroy any infected foliage that appears during the growing season. - Source: Internet
  • Transplanting iris is a normal part of iris care. When well cared for iris plants will need to be divided on a regular basis. Many gardeners wonder when is the best time to transplant iris and how should one go about moving iris from one place to another. Keep reading to learn more about how to transplant iris. - Source: Internet
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