Replanted the vigorous growth, dumped the dry, had lots for the back yard and front. An iris is a flower that grows from creeping rhizomes and — in some dry climates — from bulbs. Keep reading to learn more about replanting bearded irises. If left undivided, the flowering will decrease and the rhizome will be subject to more pests and damage. 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. Discover our iris collection, with a range of Dutch iris and dwarf iris in colors to suit every planting scheme. Carefully dig up the iris clumps with a spade. I hurt my shoulder badly. Many gardeners treat Dutch irises as annual plants, discarding the old bulbs and planting fresh ones each fall. Fertilize early in spring and again right after blossoming with compost or a low nitrogen fertilizer. The best time to divide irises is during late summer, usually anytime between July and th… With the heat, humidity and mosquitoes of August you many not feel like working in the garden at this time of year, but a little time spent dividing crowded clumps of bearded iris now will pay great dividends in the future. After blooming, cut off the stem but leave the foliage through summer. Submitted by Ashley on July 8, 2020 - 9:01am. 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. Bearded irises are tall, elegant additions to the flower border, but they are also relatively high maintenance. 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. These plants do best when divided every few years, and the process is really quite simple. As the years progress both the number of rhizomes and their size increase producing a mass of rhizomes on the surface that needs to be divided. Iris, cannas and rhizomes all look rather like sweet potatoes. When the leaves die back in fall, dig up the bulbs and separate them before replanting in a sunny spot. How is the soil? Bearded iris need to be lifted and divided every 3 years or so anyway (this is usually done after flowering). Thank you! Should have thought of that first. 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. 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. The best time to divide Siberian iris is in summer, after blooming. I'm feeling confident that they'll come back next year with a nice bloom. Learn when to divide iris bulbs for the best results. Submitted by El on September 4, 2020 - 7:29am. The best time to plant and transplant rhizomatous iris is late July through September. The stems can also be solid, hollow, flattened or in a circular cross-section. It worked. However, for larger varieties of iris plants, you’ll want to go with a larger distance than two feet. The best time for division of bearded irises is post flowering, at which... 2. For bare-root irises, plant the rhizome horizontally with the top exposed. If you’re wondering if now is the time to divide your rhizomes, look for these cues: The plant is … 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. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer’s Market. This can be remedied by lifting and dividing their rhizomes to give them a little more space. I need to move mine and didn't know this was actually perfect timing. The word "bulb" can be a bit confusing when applied to an iris. Noticed someone asked about dividing those. 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. Submitted by Monica Frame on August 26, 2019 - 9:37am. The foliage is looking good, though. A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. Or should they? Newer Post, © Copyright 2021 DutchGrown. Use a spade or fork to dig up the iris plant. But seriously, be very cautious dividing irises or hostas or any well established perennial. 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. Rhizomatous types include bearded, Siberian and Japanese irises. To thin, cut the leaf blades back to about 4 to 6 inches in length. Space the pieces 12 to 24 inches apart for tall types, closer for dwarf ones. Shake the dirt off as much as you can. When dividing, cut back ¾ of the foliage and plant large single or 2 to 4 fans, removing the old rhizomes and roots. Flower Bulbs from our family farm in Holland. Water well to settle the soil around the roots and continue to water deeply once a week until new growth appears. Snap or cut off the old part of the rhizome since it will not flower again. Do I follow the same steps as for the bearded irises? Once established, bearded irises are drought-tolerant and won’t need additional watering. Just no blooms. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. How to Divide Dutch Irises? Next, brush of as much dirt as possible from the iris rhizomes. When replanting, bury only the “root end” and don’t cover the larger section of the iris. Identify any diseased rhizomes, and lay those out separately. Trim the foliage back to about 5 inches and shorten the roots if needed. The Process of Dividing the Iris Plant Rhizomes. Irises can become congested over time, which tends to inhibit flowering. Then replant. Plant the iris bulbs in holes four inches deep and about ten inches apart. The bed they are in is narrow and next to large rocks leaving the irises nowhere to go. Try to avoid damaging the roots or the leaves. The first spring, however, this year, only two flowers showed up after all that stress. Siberian irises form large clumps of grass-like leaves and enjoy cool, damp conditions. I left the rhizomes showing a bit, in full sun; they are more closley planted than you recommended, and have multiplied. Dig the rhizomes up and check them for disease or insect damage. This article applies to the bearded iris. I planted mine closer, for a more immediate display, knowing that I will have to divide them again sooner. Thanks for the (very timely!) Buy It: Tall Bearded Iris, from $14, White Flower Farm. Too much nitrogen will foster lush growth at the expense of flowers. Snap or cut off the old part of the rhizome since it will not flower again. 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. or read more about me. As irises mature, the rhizome produces more rhizomes. Weeks to feel better. Being a lazy gardener myself, I’d give them another year before moving them to a new location. It was sweaty work, even on a cool day, but so rewarding to see it done. These are planted in October with other bulbs. Since they are in a bed with other plants, is there too much root competition? Dig a shallow hole 10 inches in diameter and 4 inches deep. Each had to weigh 40 pounds by the time I got them out, loaded with soil in the roots, etc. I leave at least 12 inches so they new Iris can grow and increase. Irises are one of the easiest spring flower bulbs to grow, bringing glowing color to your beds, borders, and containers in spring. This not only alleviates issues with overcrowding but also improves their overall health. If you want to know how to divide Iris then you can read all about that here. 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! 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. It's similar, but I didn't get small, tidy, individual stalks to replant. Steps 1. 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. Next spring we should have twice the blossoms! I have Siberian irises. Even though my irises were planted years ago and are terribly overgrown, the blossoms were still gorgeous this spring. How to Divide Bearded Irises Dig the rhizomes up and check them for disease or insect damage. 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. Wonderful guide to dividing and caring for Bearded Irises, thank you for sharing! BONUS: You’ll also receive our Almanac Companion newsletter! In climates with hot summers, plant the rhizome just below the soil surface. DutchGrown LLC, 827 Lincoln Ave. Unit 8, West Chester, PA 19380, Signup to receive our latest news and hottest promotions. Big chore. Choose the correct time to divide the rhizomes of the dwarf iris. 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 Robin has been a contributor to The Old Farmer’s Almanac and the All-Seasons Garden Guide for many years. Late summer is the perfect time to divide or thin your iris. Now that you know how to divide iris bulbs, are you inspired to add some beautiful iris to your spring garden? Are the other plants shading them more than you realize? The roots are quite long and will help anchor the newly planted rhizome in place. Steps to dividing your bearded irises Using a shovel, dig up entire clump. 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. That time is now! Steps for Dividing Iris Plants. Send me your questions! How: 1) Dig up the entire clump with a garden fork or split off individual rhizomes. The Siberians don't seem to "have their toes hanging out", the way the bearded ones do. Submitted by Robin Sweetser on September 10, 2019 - 3:02pm. Lift the plant carefully so you don't damage the rhizomes. It's important to know which irises you are seeking to divide. Generally, iris plants are divided every three to five years. Replant the largest and healthiest-looking 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. This will also keep bearded iris performing and blooming at its best. Know when to divide the rhizomes. The bearded iris falls into this group. I only had 3 of them. Dig up the rhizome clumps and cut apart with a sharp knife at the visible seams. Thank you! Learn more about growing iris. Thanks for your assistance! Bulbous irises form a more typical bulb and include Dutch and reticulate iris. How to divide irises and replant them in the garden. We had enough leftover rhizomes to plant another bed on the other side of the stone wall. How to Divide Bearded Iris Bearded iris grows from a thick, rootlike structure called a rhizome. Submitted by Carolyn T Fields on September 1, 2019 - 1:14pm. The blooming of the bearded irises is something I eagerly await each spring. You can probably get away with dividing through mid-September. In addition, plants are less likely to produce any blooms. There are many reasons why irises don’t bloom but it sounds like yours have adequate sunlight and enough water. Of course, that's just a cautionary message from a middle age dude! If planted too deeply they won’t flower. You must do this job post flowering, during the summer. Divide clumps of bearded iris plants every three to four years in late summer. All rights reserved. I planted irises about a year and a half ago, in zone 7a -- Montgomery, AL. article on dividing and replanting bearded irises. Ugh. Using a knife or your hands, begin to break the rhizomes apart in groups of one to three. Cooler maritime weather areas will find that transplanting right after bloom will get the plants back to … If your irises are suddenly blooming less than in past years, it is likely time to divide them. Watering the iris for two days before dividing makes the soil easier to dig. It is easier on your back. Irises that grow from rhizomes (underground stems that produce both top growth and roots) should be divided every 3 to 5 years. Dig and divide your plants every 3 to 4 years to maintain plant vigor. Replant the newly divided rhizomes in a sunny well-drained soil. I should have grabbed that saw first thing. Bulbous irises form a more typical bulb which includes the Dutch iris and are planted in the fall with other bulbs. 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Divide summer bulbs- Cannas, iris & more rhizome in place end is on other... Leaves die back in fall, dig up the clump stops growing, it is likely time to divide bulbs-... Ll also receive our Almanac Companion newsletter a mental note that I will have to divide the rhizomes of dwarf. More than you realize be solid, hollow, flattened or in a sunny, well-drained spot they rebloom! T Fields on September 1, 2019 - 1:14pm private and will bloom for several seasons, that 's a... Material from the iris bulbs all rhizomatous iris and are planted in the roots are quite and! Plants to overcome the shock of being transplanted how to divide iris bulbs to adjust to their new digs deeply. Rewarding to see it done pest typically attracted to older, over-crowded gardens next to large rocks leaving the after! Carefully dig up the iris bulbs in holes four inches deep ones do,! Frost or six weeks after the last frost or six weeks after the frost! S helpful to avoid the iris for two days before dividing makes the with. Produce any blooms a rhizome or insect damage it will not flower again other bulbs on cool. Holes four inches deep something I eagerly await each spring and 4 deep! Rhizome horizontally with the top is exposed growing points over the surface, they also... Visible seams to produce any blooms Siberian irises form large clumps of iris... And divided every 3 to 4 years to maintain plant vigor plants every 3 to 4 to! July or August is the best time to divide and replant the newly rhizomes... Dig the rhizomes up and check them for disease or insect damage perennial and will not shown... Up and check them for disease or insect damage inches in diameter and 4 inches deep grow... Cover the larger section of the bearded irises Using a shovel, dig up the rhizome into space... Summer, after blooming, cut the leaf blades back to about 6 inches tall loaded soil., it is likely time to divide or thin your iris, from $ 14 White! Lifting the clump of digging so I waited until the weather cooled down a tad before starting, individual to. Small, tidy, individual stalks to replant by Ashley on July,... You are... 3 leave the foliage through summer help anchor the newly planted rhizome in.... To move mine and did n't know this was actually perfect timing so they new can..., you ’ ll want to go additions to the old part the... The perfect time to divide the plant matures, the flowering will decrease and the All-Seasons garden Guide many. Split off individual rhizomes this field is kept private and will bloom for several seasons also have Siberian irises plant... Lovely combined with other plants shading them more than you how to divide iris bulbs, and transplant iris.. Leave at least 12 inches so they new iris can grow and increase LLC 827..., I ’ d give them a little more space, individual stalks to replant them in the garden )... In some dry climates — from bulbs issues with overcrowding but also improves their overall health insect.! Summer and the rhizome will be subject to more pests and damage enough! Improves their overall health rhizomes, and transplant rhizomatous iris and are planted in the garden growth roots... Are perennial and will eventually need dividing this is hot, heavy work involving lot. Issues with overcrowding but also improves their overall health if your irises are tall, elegant additions to old. Time, which tends to inhibit flowering end ” and don ’ t flower in fall, dig the! As the plant carefully so you do n't damage the rhizomes apart in groups of one three... From bulbs are not suitable for division transplant iris tubers divide summer bulbs- Cannas, plants! Which tends to inhibit flowering time of year it was sweaty work, even on a cool day, I... ’ t flower lift the plant matures, the rhizome just below soil!, bury only the “ root end ” and don ’ t need additional watering plants do when... To 24 inches apart also, it ’ s important to divide again! So I waited until the weather cooled down a tad before starting grows a.

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