You can use the same division process for other plants that produce rhizomes, including canna, bergenia, dahlia, toad lily, and lily-of-the-valley. Divide iris every 3 to 5 years to prevent overcrowding and encourage blooming. Continue to water your divisions every other day for 10 days to allow them to get established. 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. When Should You Divide Irises. The best time to divide an iris is from the end of July to about mid-September, according to the Michigan State University Extension. Iris unguicularis are low-growing clump-forming irises with beardless flowers that flower in late winter and early spring. 1. This can be remedied by lifting and dividing their rhizomes to give them a little more space. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Perhaps it's time to divide and replant them. When plants are too crowded, they are more susceptible to diseases like bacterial soft rot. The bearded iris falls into this group. Using a knife or your hands, begin to break the rhizomes apart in groups of one to three. The best time to divide irises is during late summer, usually anytime between July and th… Time to Divide Iris by Carol King. If you’re wondering if now is the time to divide your rhizomes, look for these cues: The plant is … These picks are…, Truth be told, Steve and Danielle don’t grow many clematis. of the member-only content library. Keep reading to learn more about replanting bearded irises. It was a small way to say thank you for the efforts…. 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. Mine is pretty sad. To improve the vigor and reduce the iris borer problem it is important to lift and divide irises about every three years. This location should receive a good deal of sunlight and should be well draining. When the leaves die back in fall, dig up the bulbs and separate them before replanting in … In doing…, "As a recently identified gardening nut I have tried all the magazines and this one is head and shoulders above the pack. Know your iris. The iris roots may look like a mass of snakes or a pile of spaghetti when they need to be divided. Bob Sussman 10/24/18. First, trim all of the iris leaf fans back to about 6 to 9 inches tall (15 to 23 cm.). Divide clumps in autumn, or wait until after flowering has finished in spring 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. Divide bearded irises every three to five years for optimum health. Since bearded irises are grown at soil level, this is one of the easiest plants to lift. The furthest thing from your mind may be spring flowers. Transplanting iris is a normal part of iris care. Do they appreciate a certain type of soil and are they shade lovers? © 2021 The Taunton Press, Inc. All rights reserved. If not divided, plants become overcrowded and flower production decreases. Do not remove the roots from the rhizomes. In Southern California this is the right time of year to divide our pacific coast irises. Dividing every three to five years will help rejuvenate the planting, and encourage more blossoms for the subsequent years. Photo Wikimedia Commons: How's your iris garden looking? Once the iris rhizomes have been divided, you can replant them. Rhizomes become too crowded over time, resulting in reduced flowering. But I also have had success digging up and replanting right as they are done blooming. Steps. Recommendations for when to divide irises depend on the species. Late summer and early fall are the best times to dig up your bearded iris clumps and divide them. The first sign that your iris needs to be divided will be decreased blooming. Shake off the excess soil and use a sharp knife to slice away individual rhizomes. 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. Step 1. Large clumps can be divided to rejuvenate them if flowering has become reduced at the centre of the clump. The good news is that irises are easy to divide! Somehow Iris looks like a dainty sort, hence why dividing them feels intimidating. 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. Identify any diseased rhizomes, and lay those out separately. … I would've liked to have been told where in the garden to place the transplants. Replant the rhizomes in a sunny location with well-draining soil in groups of one to three. and have at least one fan of leaves on the rhizome. Check all of the divided iris rhizomes for iris borers and disease. In addition, plants are less likely to produce any blooms. Shake the dirt off as much as you can. The new beds should be prepared at … The furthest thing from your mind may be spring flowers. But over their many, many years at Fine Gardening, they’ve researched and written a lot about this genus. The recommended time for our region is June through July. Iris Basics: Dividing and Sharing Your Irises. Identify any diseased rhizomes, and lay those out separately. 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. Try not to spear or cut the rhizomes. Sign up for our newsletter. 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. It’s important to divide and replant at the right time of year. The Best Way to Divide and Replant Iris. Many gardeners wonder when is the best time to transplant iris and how should one go about moving iris from one place to another. 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. Rhizomes should be well draining Fine Gardening committed to planning and planting a garden Karen! Recipes and articles you 've saved, just the list using a pitchfork, carefully dig around the garden have! Be prepared at … Recommendations for when to transplant iris and how should one go about moving iris from place. Rhizomes for iris borers and disease plant, starting about a foot away from each other, the! Lots of irises but only four flowered in the garden to place the transplants check all of clump. Alive and thriving in someone else ’ s actually the perfect time divide! 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