Ugh. The bed they are in is narrow and next to large rocks leaving the irises nowhere to go. To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. Given that division can differ slightly between irises, it is important to know which irises you are... 3. They have a long and erect flowering stem that can be simple or branched. It was sweaty work, even on a cool day, but so rewarding to see it done. Learn more about growing iris. Dig up the rhizome clumps and cut apart with a sharp knife at the visible seams. Crowded plants are also more prone to disease problems. Split iris between late July and the end of September, and use the divisions to start a new iris bed, or give them away to family and friends. 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. Submitted by El on September 4, 2020 - 7:29am. The best time for division of bearded irises is post flowering, at which... 2. Thanks for your assistance! How to divide irises and replant them in the garden. Plant rhizomes singly or in groups of three, 1 to 2 feet apart, depending on the size. Snap or cut off the old part of the rhizome since it will not flower again. I hurt my shoulder badly. How to divide summer bulbs- Cannas, Iris & more. Late summer is the perfect time to divide or thin your iris. Do I follow the same steps as for the bearded irises? For bare-root irises, plant the rhizome horizontally with the top exposed. Water the area well after planting. Just no blooms. This not only alleviates issues with overcrowding but also improves their overall health. How is the soil? Pinched a nerve. Siberian irises form large clumps of grass-like leaves and enjoy cool, damp conditions. They have not bloomed. Replant the largest and healthiest-looking rhizomes. Do they like it drier? Dig a shallow hole 10 inches in diameter and 4 inches deep. Big chore. You can help cut down on the incidence of soft rot and borer damage through the regular division of the iris rhizomes, every 2 to 3 years. How to divide iris: Step-by-step instructions Dividing Iris Why: Division every 3-4 years is important for continual bloom and vigorous and healthy plant growth. How: 1) Dig up the entire clump with a garden fork or split off individual rhizomes. The blooming of the bearded irises is something I eagerly await each spring. Tried different methods to separate clumps and get rid of the dead areas and after failing and struggling many times, I settled on a handsaw! Loosen around the clump as best you can. When to divide irises Rhizomatous irises (having fleshy stems at soil level) are divided just after flowering Clump forming irises are divided in early autumn or early spring This is hot, heavy work involving a lot of digging so I waited until the weather cooled down a tad before starting. I should have grabbed that saw first thing. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. Make a mound of soil in the middle to place the rhizome on, spread the roots out over the mound and cover them with soil. Bulbous irises form a more typical bulb and include Dutch and reticulate iris. Do NOT divide in the spring. Custom programming and server maintenance by. Dwarf irises, with their royal blue blooms supported on short stems, bring a bold splash of color to the garden in early spring. You must do this job post flowering, during the summer. I am moving in the near future and want to take my Irises with me as they were also gifts, I wasn't sure how to go about it, but now I'm a lot more confident about tackling the project. Steps for Dividing Iris Plants. Bearded iris need to be lifted and divided every 3 years or so anyway (this is usually done after flowering). This is also the best time (plants are normally dormant during the heat of July and August) to divide and replant iris that have become overcrowded, usually after three to five years. In addition, plants are less likely to produce any blooms. Being a lazy gardener myself, I’d give them another year before moving them to a new location. Dividing Iris bulbs All rhizomatous iris and true bulb types require dividing eventually to ensure strong growth as well as allow plants to multiply. It’s important to divide and replant at the right time of year. Often it just takes a few years for the plants to overcome the shock of being transplanted and to adjust to their new digs. Also, it’s helpful to avoid the iris borer which is a very destructive pest typically attracted to older, over-crowded gardens. I planted irises about a year and a half ago, in zone 7a -- Montgomery, AL. Divide after the last frost or six weeks after the last bloom. Know your iris. When the leaves die back in fall, dig up the bulbs and separate them before replanting in a sunny spot. In Iowa, July or August is the best time to dig, divide, and transplant bearded irises. There are many reasons why irises don’t bloom but it sounds like yours have adequate sunlight and enough water. How to Divide Bearded Irises Dig the rhizomes up and check them for disease or insect damage. DutchGrown LLC, 827 Lincoln Ave. Unit 8, West Chester, PA 19380, Signup to receive our latest news and hottest promotions. Here’s how to divide irises—with step-by-step pictures. Steps 1. If planted too deeply they won’t flower. Snap or cut off the old part of the rhizome since it will not flower again. How to Divide Dutch Irises? Use a spade or fork to dig up the iris plant. Each had to weigh 40 pounds by the time I got them out, loaded with soil in the roots, etc. Ensure the rhizome is erect while the roots are spread out. If you are looking for an easy flower to grow to create a border along your house or need to fill up a flower bed quickly, then irises may be a flower to consider. Leave the foliage over the summer until it dies back naturally in fall, then dig up the Dutch iris bulbs, discard any damaged ones and replant them in a new location. 2) Remove excess dirt and dead material from the clump. All rights reserved. The Process of Dividing the Iris Plant Rhizomes. The strappy leaves seem healthy but it is a bed with other plans (shrubs and perennials) that need more water than is suggested here. This can be remedied by lifting and dividing their rhizomes to give them a little more space. Get inspired by Robin Sweetser’s backyard gardening tips and tricks. When your irises become overcrowded, its time to divide and transplant iris tubers. Noticed someone asked about dividing those. Next season’s plant emerges from the fan end of the rhizome so when replanting, face it in the direction you want plant growth to travel. Fertilize early in spring and again right after blossoming with compost or a low nitrogen fertilizer. The best time to divide iris is in early fall: Many gardeners treat Dutch irises as annual plants, discarding the old bulbs and planting fresh ones each fall. How to Divide Bearded Iris Bearded iris grows from a thick, rootlike structure called a rhizome. Bearded irises grow from thick, underground stems called rhizomes. When To Plant For best results, plant iris rhizomes in July, August or September. Irises that grow from rhizomes (underground stems that produce both top growth and roots) should be divided every 3 to 5 years. Trim the foliage back to about 5 inches and shorten the roots if needed. Iris, cannas and rhizomes all look rather like sweet potatoes. If the iris bed is producing plenty of green foliage but very few blooms, it's a sign that the iris rhizomes have become crowded, and it's time to divide. They look lovely combined with other spring flower bulbs in beds and containers and will also naturalize in clumps when planted in grass. We found some borer damage and mushy rhizomes that we discarded. It worked. Buy It: Tall Bearded Iris, from $14, White Flower Farm. The best time to divide irises is during late summer, usually anytime between July and th… Is the top of the rhizome near the surface of the soil? But seriously, be very cautious dividing irises or hostas or any well established perennial. Irises that are grown from bulbs are not suitable for division. The bearded iris falls into this group. If you want to know how to divide Iris then you can read all about that here. Divide clumps of bearded iris plants every three to four years in late summer. Are the other plants shading them more than you realize? My goal was to rework the iris beds, add some compost, get rid of the invading sedums and tree roots, and divide and replant the crowded rhizomes. Not sure if I should dig them up and plant on the west side of a north-south run of privacy fencing, where they would get almost all day full sun; they are currently opposite, on the east side of a north-south fencing, getting morning and until 2 pm sun. Submitted by Robin Sweetser on September 10, 2019 - 3:02pm. If your irises are suddenly blooming less than in past years, it is likely time to divide them. Weeks to feel better. Keep reading to learn more about replanting bearded irises. Submitted by Monica Frame on August 26, 2019 - 9:37am. Submitted by Ashley on July 8, 2020 - 9:01am. The first spring, however, this year, only two flowers showed up after all that stress. I planted mine closer, for a more immediate display, knowing that I will have to divide them again sooner. Division of bearded iris plants and siberian iris rhizomes or bulbs is not a difficult task for any gardener provided you have the right tools. As the plant matures, the rhizome multiplies, which in turn lead to more leaves and flowers. Dig and divide your plants every 3 to 4 years to maintain plant vigor. Some Irises (ones that grow like a clump of grass), can be lifted and divided up with a sharp knife or spade. Thank you! The Best Time to Separate Iris Bulbs. Flower Bulbs from our family farm in Holland. It is easier on your back. Send me your questions! These plants do best when divided every few years, and the process is really quite simple. These are planted in October with other bulbs. It's similar, but I didn't get small, tidy, individual stalks to replant. Divide irises during the summer … Lift the plant carefully so you don't damage the rhizomes. The best time to divide Siberian iris is in summer, after blooming. Watering the iris for two days before dividing makes the soil easier to dig. Cut back the leaves to 1/3 their original height. Next spring we should have twice the blossoms! Replanted the vigorous growth, dumped the dry, had lots for the back yard and front. Of course, that's just a cautionary message from a middle age dude! This year, I made a mental note that I should divide and replant the irises after flowering. Dig up the clump and separate it into several sections, then replant them about 1” deep in soil enriched with compost. Thank you! See the Almanac’s Iris Growing Guide. This will also keep bearded iris performing and blooming at its best. Once the holes are dug, place the rhizome into the space. The irises are getting crowded and encroached upon by sedum. A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. We had enough leftover rhizomes to plant another bed on the other side of the stone wall. Put them all on tarps - lots of dirt, easier to clean up. Increasing means make new rhizomes you can divide out later for more Iris. That time is now! Replanting Iris after dividing. However, if the center of the clump stops growing, it’s time to divide the plant. Should have thought of that first. Discover our iris collection, with a range of Dutch iris and dwarf iris in colors to suit every planting scheme. Identify any diseased rhizomes, and lay those out separately. I'm feeling confident that they'll come back next year with a nice bloom. The foliage is looking good, though. They are perennial and will bloom for several seasons. Irises like a near neutral pH and even amounts of nitrogen, phosphorus, and potassium. Dig up Iris Rhizomes Start a good 5 to 6 inches back from the base of the Iris clump and dig in your shovel or garden fork. The Siberians don't seem to "have their toes hanging out", the way the bearded ones do. I left the rhizomes showing a bit, in full sun; they are more closley planted than you recommended, and have multiplied. I need to move mine and didn't know this was actually perfect timing. All of my irises came from the gardens of family and friends, so they are precious to me and I don’t want to lose them due to my neglect. Submitted by Carolyn T Fields on September 1, 2019 - 1:14pm. Wonderful guide to dividing and caring for Bearded Irises, thank you for sharing! An iris is a flower that grows from creeping rhizomes and — in some dry climates — from bulbs. In many regions, July through August is the best time to dig, divide and transplant bearded irises. It is easier to plant if you cut the tops back to about 6 inches tall. Irises can become congested over time, which tends to inhibit flowering. Newer Post, © Copyright 2021 DutchGrown. To thin, cut the leaf blades back to about 4 to 6 inches in length. BONUS: You’ll also receive our Almanac Companion newsletter! Older Post Know when to divide the rhizomes. 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. If left undivided, the flowering will decrease and the rhizome will be subject to more pests and damage. After 5 years, they slowed blooming and I could see the center was dead, an outer ring still green = time to divide. Learn when to divide iris bulbs for the best results. Too much nitrogen will foster lush growth at the expense of flowers. Shake the dirt off as much as you can. Even though my irises were planted years ago and are terribly overgrown, the blossoms were still gorgeous this spring. It's important to know which irises you are seeking to divide. Water well to settle the soil around the roots and continue to water deeply once a week until new growth appears. Now that you know how to divide iris bulbs, are you inspired to add some beautiful iris to your spring garden? Leave the foliage over the summer until it dies back naturally in fall, then dig up the Dutch iris bulbs, discard any damaged ones and replant them in a new location. However, given a sunny, well-drained spot they will rebloom and will eventually need dividing. After blooming, cut off the stem but leave the foliage through summer. However, for larger varieties of iris plants, you’ll want to go with a larger distance than two feet. Choose the correct time to divide the rhizomes of the dwarf iris. However, given a sunny, well-drained spot they will rebloom and will eventually need dividing. Try to avoid damaging the roots or the leaves. When dividing, cut back ¾ of the foliage and plant large single or 2 to 4 fans, removing the old rhizomes and roots. Rhizomatous types include bearded, Siberian and Japanese irises. Once established, bearded irises are drought-tolerant and won’t need additional watering. You can probably get away with dividing through mid-September. 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. Thanks for the (very timely!) I leave at least 12 inches so they new Iris can grow and increase. Space the pieces 12 to 24 inches apart for tall types, closer for dwarf ones. Carefully dig up the iris clumps with a spade.