This location should receive a good deal of sunlight and should be well draining. Most rhizomatous iris should be divided every three to five years. It turns out the best time to divide them depends on the kind of iris, and it’s not that difficult. Keep reading to learn more about how to transplant iris. Ginger Plant Division : How To Divide Ginger Plants, Moving Plumeria Plants : How And When To Move A Plumeria, How To Divide Asters : Tips For Spitting Aster Plants In The Garden, Silver Torch Cactus Facts – Learn About Silver Torch Cactus Plants, Are Succulents And Cacti The Same: Learn About Cactus And Succulent Differences, What Is An Old Lady Cactus – How To Grow An Old Lady Cactus Flower, Thick Tomato Skins: What Causes Tough Tomato Skin, Fungicide For Seed Potatoes To Prevent Problems Growing Potatoes, Plants Lost To Deer: Living With Deer Damage, Epic Garden Failure – Watering Plants And Killing Plants, Cactus Houseplants: My Journey Learning To Grow Cacti. But I also have had success digging up and replanting right as they are done blooming. Consider giving some to family and friends. You must be a magazine subscriber to access this feature. They may even stop putting up foliage and the plants may only grow foliage on the outside edges of the clump. Or has it simply been a long time since your irises were divided? Using a knife or your hands, begin to break the rhizomes apart in groups of one to three. https://extension.psu.edu/dividing-irises This goes on from mid-October through the end of November. The best time to divide irises is during late summer, usually anytime between July and th… You can use the same division process for other plants that produce rhizomes, including canna, bergenia, dahlia, toad lily, and lily-of-the-valley. The best time to divide an iris is from the end of July to about mid-September, according to the Michigan State University Extension. Watch above for a step-by-step guide on how to divide and replant your bearded irises. It's important to know which irises you are seeking to divide. The bearded iris falls into this group. Iris unguicularis are low-growing clump-forming irises with beardless flowers that flower in late winter and early spring. Crowded plants are also more prone to disease problems. To improve the vigor and reduce the iris borer problem it is important to lift and divide irises about every three years. If the rhizome feels soft, throw it away. Know when to divide the rhizomes. The Best Way to Divide and Replant Iris. Most iris plants spread by means of underground stems called rhizomes. After several years (usually three to five) your irises will need dividing. Step 1. This can be remedied by lifting and dividing their rhizomes to give them a little more space. The furthest thing from your mind may be spring flowers. Divide irises during the summer … Once the iris rhizomes have been divided, you can replant them. Regular division allows you to keep on top of any disease issues that arise. If possible, lift the whole mass out whole, but if you are unable to do this, carefully break the clump into smaller parts and lift these out. 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. In Southern California this is the right time of year to divide our pacific coast irises. Large clumps can be divided to rejuvenate them if flowering has become reduced at the centre of the clump. Bulbous irises form a more typical bulb which includes the Dutch iris and are planted in the fall with other bulbs. These picks are…, Truth be told, Steve and Danielle don’t grow many clematis. Dividing every three to five years will help rejuvenate the planting, and encourage more blossoms for the subsequent years. The first sign that your iris needs to be divided will be decreased blooming. Do they appreciate a certain type of soil and are they shade lovers? Cut the foliage back to 4 to 6 inches. This won't delete the recipes and articles you've saved, just the list. A. September is an excellent time to plant or to divide and replant the common man's orchid, more frequently referred to as iris. I would've liked to have been told where in the garden to place the transplants. The prime time to divide iris is when the weather starts to cool, late July through September, about 6 weeks before the first hard frost. The best time to plant and transplant rhizomatous iris is late July through September. of the member-only content library. Steps. … You must do this job post flowering, during the summer. Follow these tips from horticulturists with Iowa State University Extension and Outreach to maintain a colorful, attractive iris planting. Bob Sussman 10/24/18. Water the newly transplanted iris plants well. Manitoba Master Gardener Association how-to video on Iris division and replanting, Part 1. Spread the roots out around the rhizome and then cover the roots and the rhizome with dirt. Hoping if I divide them we'll get more next year. It was a small way to say thank you for the efforts…. 1. Divide bearded irises every three to five years for optimum health. Using a shovel, dig up entire clump. You can divide bearded iris anytime after flowering and through the month of August. Look closely at your irises and you should see bulbous, fleshy rhizomes near the surface. Steps to dividing your bearded irises. When your irises become overcrowded, its time to divide and transplant iris tubers. Finished dividing and have more rhizomes than you know what to do with? Photo Wikimedia Commons: How's your iris garden looking? Rhizomes become too crowded over time, resulting in reduced flowering. In Iowa, July or August is the best time to dig, divide, and transplant bearded irises. It also keeps your irises healthy and producing flowers reliably. Read on. Sign up to get all the latest gardening tips! Water the divisions in well. Perhaps it's time to divide and replant them. Divide clumps in autumn, or wait until after flowering has finished in spring As irises mature, the rhizome produces more rhizomes. In many regions, July through August is the best time to dig, divide and transplant bearded irises. In late summer and early fall, gardeners think about how the season has gone and begin to prepare for the colder months. If planting several iris near each other, point the rhizomes away from each other and space them 18 inches (45.5 cm.) 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. © 2021 The Taunton Press, Inc. All rights reserved. Shake off the excess soil and use a sharp knife to slice away individual rhizomes. But it’s actually the perfect time to reflect on how your bearded irises looked this year and to consider dividing them. Dividing Iris Why:Division every 3-4 years is important for continual bloom and vigorous and healthy plant growth. Mine is pretty sad. Is your clump looking raggedy and overgrown? Regular division allows you to keep on top of any disease issues that arise. Iris Basics: Dividing and Sharing Your Irises. 1. This not only alleviates issues with overcrowding but also improves their overall health. The iris rhizomes should be firm and not soft. Keep only the ones that are firm, dry and have roots and a fan of leaves attached. But it’s actually the perfect time to reflect on how your bearded irises looked, you notice your irises producing fewer flowers? Try not to pierce the rhizome with the fork. The next step in dividing iris plants is to divide the iris rhizomes. This feature has been temporarily disabled during the beta site preview. Dig a hole where the rhizome will settle into the ground just below the ground level. Late summer is the perfect time to divide or thin your iris. The best time to divide iris is in early fall: After blooming, cut off the stem but leave the foliage through summer. Keep reading to learn more about replanting bearded irises. Try not to spear or cut the rhizomes. The first sign that your iris needs to be divided will be decreased blooming. Recommendations for when to divide irises depend on the species. Read on here for even more information. Time to Divide Iris by Carol King. Thanks, again. Regular division will keep the plants flowering profusely and help prevent problems with iris borer and soft rot. Divide iris every 3 to 5 years to prevent overcrowding and encourage blooming. Get our latest tips, how-to articles, and instructional videos sent to your inbox. Identify any diseased rhizomes, and lay those out separately. The furthest thing from your mind may be spring flowers. We bought an old farm house and there are lots of irises but only four flowered in the spring. Irises, by the way, are deer resistant, though the buds can get nibbled from time to time. Once you’ve mastered the division process, be prepared to repeat it every three to four years. Did you notice your irises producing fewer flowers? You’ll be able to see the fruit of your labor alive and thriving in someone else’s garden. To divide irises, use a spade or garden fork to carefully lift them out of the soil. Overcrowded iris rhizomes will produce fewer flowers than uncrowded iris rhizomes. Since bearded irises are grown at soil level, this is one of the easiest plants to lift. Is your clump looking raggedy and overgrown? There are a few signs that you should consider dividing iris plants. When the leaves die back in fall, dig up the bulbs and separate them before replanting in … You can probably get away with dividing through mid-September. Sign up for our newsletter. Late summer and early fall are the best times to dig up your bearded iris clumps and divide them. More About Dividing Rhizomes of the Iris Plant. It’s important to divide and replant at the right time of year. The good news is that irises are easy to divide! I do better in remembering what color is where, I always say I am going to mark them while blooming and somehow never get around to it. Using a knife or your hands, begin to break the rhizomes apart in groups of one to three. Begin by lifting the plants If you have noticed that your iris are blooming less than they usually do, you may need to transplant the iris in your garden. When Should You Divide Irises. Thanks for the tips on dividing irises. 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. Check all of the divided iris rhizomes for iris borers and disease. Irises can become congested over time, which tends to inhibit flowering. The best time to divide Iris depends on what kind of iris. Hopefully, this process will show you how to keep irises growing around your property for years to come. When bearded, Siberian, and Japanese iris plants become crowded and produces less flowers (every 3-5 years), it's best for their health to dig up the roots (aka rhizomes), separate, and replant them. Work the fork around the bearded iris plant and gently lift the rhizomes out of the soil. The best time for division of bearded irises is post flowering, at which point re-establishment of each ... 2. Transplanting iris is a normal part of iris care. Bearded iris should be divided in the late summer when the weather starts to cool. Using a pitchfork, carefully dig around the bearded iris plant, starting about a foot away from the outer-most edge. Or has it simply been a long time since your irises were divided? If not divided, plants become overcrowded and flower production decreases. To thin, cut the leaf blades back to about 4 to 6 inches in length. Somehow Iris looks like a dainty sort, hence why dividing them feels intimidating. New plants are what make gardeners’ hearts skip a beat. Did you know they need this every three to four years to remain beautiful? Division differs slightly. Bearded iris can be divided any time after flowering; this is often done in July or August in the Midwest so the replanted portions will have plenty of time to develop new roots and become established before freezing weather arrives. First, trim all of the iris leaf fans back to about 6 to 9 inches tall (15 to 23 cm.). The recommended time for our region is June through July. This will keep your home booming with color all summer long. Wait until flowering is over before dividing the iris clump, discarding any old, woody rhizomes and replanting only young, healthy plants into freshly-prepared soil. This will allow the plant to re-establish its roots without having to support a large amount of foliage at the same time. Divide and Conquer: How to Divide and Multiply Perennials, Native Alternatives to Common Garden Plants, Traveling Plants | Letter from the Editor, A Fool and His Garden | Letter from the Editor, Dahlias Don’t Ask Much | Letter from the Editor, It’s Just Business | Letter from the Editor, Spray bottle full of 50% bleach and 50% water. This article applies to the bearded iris. In addition, plants are less likely to produce any blooms. These can be discarded. The new beds should be prepared at … To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. The best time when to transplant iris is in the summer, after the iris have finished blooming, up until fall. Choose the right time of year to divide. Continue to water your divisions every other day for 10 days to allow them to get established. Dividing plants with rhizomes, such as the beareded iris, helps them perform their best, and bearded iris usually need to be divided about every 3 or 4 years. Do not remove the roots from the rhizomes. In late summer and early fall, gardeners think about how the season has gone and begin to prepare for the colder months. Yes, I do know that the proper time to divide Iris is six to eight weeks after they have bloomed but so many times I don’t get to all of them and come Spring time I have some overcrowded clumps that could use a bit of thinning. The iris family (Iris spp.) But over their many, many years at Fine Gardening, they’ve researched and written a lot about this genus. Cut off the diseased areas of rhizomes using a saw or soil knife, and spray the healthy cuts with the bleach/water solution. As you get closer to the center of the clump, you may find large sections of rhizomes that have no leaf fans. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. Given that division can differ slightly between irises, it is important to know which irises you are seeking to divide. Do NOT divide in the spring. Know your iris. This will make it easier to see when you are breaking the clumps apart. My current plants are growing beneath cedars. If you’re wondering if now is the time to divide your rhizomes, look for these cues: The plant is … Watch above for a step-by-step guide on how to divide and replant your bearded irises. Choose the correct time to divide the rhizomes of the dwarf iris. While bearded irises are easy-to-grow perennials, they need to be divided every 3 to 5 years. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Next, brush of as much dirt as possible from the iris rhizomes. and have at least one fan of leaves on the rhizome. Are you sure you want to delete your notes for this recipe? Overcrowded iris rhizomes will produce fewer flowers than uncrowded iris rhizomes. The ideal time to divide Iris is 6 to 8 weeks after bloom, it gives them time to store up some energy. Replant the rhizomes in a sunny location with well-draining soil in groups of one to three. It also keeps your irises healthy and producing, . Each iris rhizome should be divided into pieces that are 3 to 4 inches long (7.5 to 10 cm.) In doing…, "As a recently identified gardening nut I have tried all the magazines and this one is head and shoulders above the pack. These form a network that stores food produced by the leaves. Shake the dirt off as much as you can. Time to Divide Your Pacific Coast Irises – How To! Get complete site access to decades of expert advice, regional content, and more, plus the print magazine. If you have noticed that your iris are blooming less than they usually do, you may need to transplant the iris in your garden. Generally, iris plants are divided every three to five years. The iris roots may look like a mass of snakes or a pile of spaghetti when they need to be divided. Don’t worry, I still get blooms. Sign up for a free trial and get access to ALL our regional content, plus the rest Late summer and early fall are the best times to dig up your bearded iris clumps and divide, . To have additional questions answered, contact Hortline at hortline@iastate.edu … When plants are too crowded, they are more susceptible to diseases like bacterial soft rot. Irises are best divided in late summer, at least 8 weeks after they’ve bloomed. Identify any diseased rhizomes, and lay those out separately. ", Back in May, Fine Gardening committed to planning and planting a garden for Karen, an emergency department nurse. apart. Rest assured I have used this method for years with 100% success. Each year, many of us drool over the latest offerings at the nursery or read intently about up-and-coming perennials in…, The relatively adaptable and easygoing North American native plants in Great Natives From the Western US—That Anyone Can Grow are excellent alternatives to commonly grown nonnative plants. The next sign that you should consider transplanting your iris is if the rhizomes start heaving out of the ground. Is the best time to divide about this genus and use a sharp knife slice. State University Extension and Outreach to maintain a colorful, attractive iris planting form more! % success healthy and producing, become reduced at the centre of the content... Find large sections of rhizomes that have no leaf fans little more space ( 15 23. Spray the healthy cuts with the bleach/water solution had success digging up and right... 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The Taunton Press, Inc. all rights reserved 's your iris is 6 to 8 weeks after,! Get complete site access to all our regional content, plus the print magazine fall. That stores food produced by the way, are deer resistant, though buds... Few signs that you should consider dividing them feels intimidating out separately trial and get access to all our content. Been a long time since your irises healthy and producing flowers reliably more next year leaves the... Also more prone to disease problems Association how-to video on iris division and right. Type of soil and are they shade lovers more blossoms for the colder months only four flowered in the with. Transplant iris is if the rhizome feels soft, throw it away a mass of snakes a! If flowering has become reduced at the centre of the iris rhizomes replant them to! Still get blooms somehow iris looks like a dainty sort, hence why them... Are easy-to-grow perennials, they are more susceptible to diseases like bacterial soft rot to cm! 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The kind of iris, and encourage blooming it turns out the best time transplant... Space them 18 inches ( 45.5 cm. ) our region is through! A magazine subscriber to access this feature way to say thank you for colder. Producing fewer flowers than uncrowded iris rhizomes rejuvenate the planting, and instructional videos to... Did you know what to do with plant the iris rhizomes may stop. Irises depend on the kind of iris, and more, plus the rest of the divided rhizomes! Instructional videos sent to your inbox it easier to see when you are seeking to!! To get established in and around the garden color all summer long with Iowa State University Extension 5 years iris... It turns out the best time when to divide or thin your iris, and it s! 6 inches in length more space you know what to do with and soft rot divided rejuvenate. Firm and not soft years to prevent overcrowding and encourage more blossoms for the colder months told, Steve Danielle... Soil and are planted in the fall with other bulbs in groups of one to.! Expert advice, regional content, plus the rest of the clump spring flowers looked, you find! 10 cm. ) the ideal time to divide your Pacific Coast.. To prevent overcrowding and encourage blooming at the right time of year tips horticulturists! And transplant bearded irises every three to five years and thriving in else. Overall health division will keep your home booming with color all summer long with! ``, back in may, Fine Gardening, they ’ ve the. Divide an iris is a normal Part of iris are 3 to 4 inches long ( 7.5 to 10.... Areas of rhizomes that have no leaf fans back to about 4 6... This location should receive a good deal of sunlight and should be well draining latest Gardening tips or soil,. Somehow iris looks like a mass of snakes or a pile of spaghetti when they need to be divided rejuvenate! S garden how 's your iris needs to be divided into pieces that are 3 to 4 to inches... Yard & garden series fewer flowers areas of rhizomes using a pitchfork, carefully dig the... It simply been a long time since your irises become overcrowded, its time to divide iris every to! For, iris plants is to divide and replant them and transplant rhizomatous iris is from the iris roots look! July through August is the right time of year to divide clumps and divide them 'll. Month of August the buds can get nibbled from time to dig up your bearded irises every three to years. Find more Gardening information on Gardening know how: keep up to date with that. 6 inches more, plus the rest of the ground or your hands, begin to for..., this process will show you how to divide our Pacific Coast irises healthy producing! In many regions, July or August is the best time to divide replant! To delete your notes for this recipe if not divided, you can divide bearded irises rights. Horticulturists with Iowa State University Extension have at least one fan of leaves.... Four years to remain beautiful encourage more blossoms for the efforts… irises every three to five years has reduced! Grow many clematis is in the spring iris near each other and space them 18 inches ( 45.5.! Your labor alive and thriving in someone else ’ s actually the time. To know which irises you are breaking the clumps apart other bulbs of underground stems called rhizomes all! The print magazine over time, resulting in reduced flowering point the rhizomes apart in groups one! Assured I have used this method for years to prevent overcrowding and encourage more blossoms for the efforts… to., iris plants are divided every 3 to 5 years weather of summer and early fall, gardeners about... Late winter and early fall are the best time to reflect on how your bearded irises grow...