Then replant. The content of this field is kept private and will not be shown publicly. DutchGrown LLC, 827 Lincoln Ave. Unit 8, West Chester, PA 19380, Signup to receive our latest news and hottest promotions. 2) Remove excess dirt and dead material from the clump. Irises are one of the easiest spring flower bulbs to grow, bringing glowing color to your beds, borders, and containers in spring. See the Almanac’s Iris Growing Guide. Thanks for the (very timely!) I should have grabbed that saw first thing. Using a knife or your hands, begin to break the rhizomes apart in groups of one to three. Do they like it drier? They look lovely combined with other spring flower bulbs in beds and containers and will also naturalize in clumps when planted in grass. Newer Post, © Copyright 2021 DutchGrown. I have Siberian irises. or read more about me. These plants do best when divided every few years, and the process is really quite simple. Cooler maritime weather areas will find that transplanting right after bloom will get the plants back to … Dig a shallow hole 10 inches in diameter and 4 inches deep. This year, I made a mental note that I should divide and replant the irises after flowering. The Siberians don't seem to "have their toes hanging out", the way the bearded ones do. Water the area well after planting. After blooming, cut off the stem but leave the foliage through summer. It worked. How to Divide Dutch Irises? I left the rhizomes showing a bit, in full sun; they are more closley planted than you recommended, and have multiplied. I also have Siberian Irises, which should be divided because their patch is becoming crowded. Here’s how to divide irises—with step-by-step pictures. In Iowa, July or August is the best time to dig, divide, and transplant bearded irises. Since they are in a bed with other plants, is there too much root competition? When plants are too crowded, they are more susceptible to diseases like bacterial soft rot. Division differs slightly. 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. How: 1) Dig up the entire clump with a garden fork or split off individual rhizomes. Replanted the vigorous growth, dumped the dry, had lots for the back yard and front. Irises can become congested over time, which tends to inhibit flowering. Plant the iris bulbs in holes four inches deep and about ten inches apart. Flower Bulbs from our family farm in Holland. There are many reasons why irises don’t bloom but it sounds like yours have adequate sunlight and enough water. If you want to know how to divide Iris then you can read all about that here. The foliage is looking good, though. Wonderful guide to dividing and caring for Bearded Irises, thank you for sharing! Custom programming and server maintenance by. Cut back the leaves to 1/3 their original height. Learn more about growing iris. 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. The Process of Dividing the Iris Plant Rhizomes. 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. 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. Steps 1. In many regions, July through August is the best time to dig, divide and transplant bearded irises. Do NOT divide in the spring. The Best Time to Separate Iris Bulbs. If planted too deeply they won’t flower. This is hot, heavy work involving a lot of digging so I waited until the weather cooled down a tad before starting. It’s important to divide and replant at the right time of year. Each had to weigh 40 pounds by the time I got them out, loaded with soil in the roots, etc. If you’re wondering if now is the time to divide your rhizomes, look for these cues: The plant is … Buy It: Tall Bearded Iris, from $14, White Flower Farm. Siberian irises form large clumps of grass-like leaves and enjoy cool, damp conditions. I only had 3 of them. The strappy leaves seem healthy but it is a bed with other plans (shrubs and perennials) that need more water than is suggested here. Send me your questions! After 5 years, they slowed blooming and I could see the center was dead, an outer ring still green = time to divide. Dig the rhizomes up and check them for disease or insect damage. Get inspired by Robin Sweetser’s backyard gardening tips and tricks. It is easier on your back. Divide after the last frost or six weeks after the last bloom. Submitted by Robin Sweetser on September 10, 2019 - 3:02pm. Many gardeners treat Dutch irises as annual plants, discarding the old bulbs and planting fresh ones each fall. Try to avoid damaging the roots or the leaves. Fertilize early in spring and again right after blossoming with compost or a low nitrogen fertilizer. Rhizomatous types include bearded, Siberian and Japanese irises. They are perennial and will bloom for several seasons. Are the other plants shading them more than you realize? This will also keep bearded iris performing and blooming at its best. I hurt my shoulder badly. Submitted by Ashley on July 8, 2020 - 9:01am. Also, it’s helpful to avoid the iris borer which is a very destructive pest typically attracted to older, over-crowded gardens. Use a spade or fork to dig up the iris plant. It is easier to plant if you cut the tops back to about 6 inches tall. It's similar, but I didn't get small, tidy, individual stalks to replant. We found some borer damage and mushy rhizomes that we discarded. The word "bulb" can be a bit confusing when applied to an iris. Replant the newly divided rhizomes in a sunny well-drained soil. Should have thought of that first. 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. Dividing Iris bulbs All rhizomatous iris and true bulb types require dividing eventually to ensure strong growth as well as allow plants to multiply. Dig and divide your plants every 3 to 4 years to maintain plant vigor. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. All rights reserved. Being a lazy gardener myself, I’d give them another year before moving them to a new location. When replanting, bury only the “root end” and don’t cover the larger section of the iris. 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. 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. Amend the soil with compost and dig a shallow hole or trench. An iris is a flower that grows from creeping rhizomes and — in some dry climates — from bulbs. Dig up the clump and separate it into several sections, then replant them about 1” deep in soil enriched with compost. Discover our iris collection, with a range of Dutch iris and dwarf iris in colors to suit every planting scheme. Shake the dirt off as much as you can. Noticed someone asked about dividing those. Do I follow the same steps as for the bearded irises? 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. Dig up the rhizome clumps and cut apart with a sharp knife at the visible seams. Iris, cannas and rhizomes all look rather like sweet potatoes. Divide clumps of bearded iris plants every three to four years in late summer. The best time to plant and transplant rhizomatous iris is late July through September. Robin has been a contributor to The Old Farmer’s Almanac and the All-Seasons Garden Guide for many years. Irises like a near neutral pH and even amounts of nitrogen, phosphorus, and potassium. The irises are getting crowded and encroached upon by sedum. Late summer is the perfect time to divide or thin your iris. Bulbous irises form a more typical bulb and include Dutch and reticulate iris. If left undivided, the flowering will decrease and the rhizome will be subject to more pests and damage. Crowded plants are also more prone to disease problems. 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. Even though bare rhizomes can survive out of the ground for 1 to 2 weeks without any damage, it is best to replant them right away. When dividing, cut back ¾ of the foliage and plant large single or 2 to 4 fans, removing the old rhizomes and roots. Just no blooms. 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. Keep reading to learn more about replanting bearded irises. Loosen around the clump as best you can. Plant iris rhizomes so the root end is on the bottom, covering with soil until just the top is exposed. When To Plant For best results, plant iris rhizomes in July, August or September. Identify any diseased rhizomes, and lay those out separately. Irises that grow from rhizomes (underground stems that produce both top growth and roots) should be divided every 3 to 5 years. Snap or cut off the old part of the rhizome since it will not flower again. To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. These are planted in October with other bulbs. A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer’s Market. 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. This article applies to the bearded iris. Some Irises (ones that grow like a clump of grass), can be lifted and divided up with a sharp knife or spade. Put them all on tarps - lots of dirt, easier to clean up. Divide irises during the summer … Often it just takes a few years for the plants to overcome the shock of being transplanted and to adjust to their new digs. Thank you! We had enough leftover rhizomes to plant another bed on the other side of the stone wall. Replanting Iris after dividing. Carefully dig up the iris clumps with a spade. This not only alleviates issues with overcrowding but also improves their overall health. Big chore. Space the pieces 12 to 24 inches apart for tall types, closer for dwarf ones. 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! Dwarf irises, with their royal blue blooms supported on short stems, bring a bold splash of color to the garden in early spring. The roots are quite long and will help anchor the newly planted rhizome in place. Replant the largest and healthiest-looking rhizomes. Learn when to divide iris bulbs for the best results. Ugh. 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. Thanks for your assistance! If your irises are suddenly blooming less than in past years, it is likely time to divide them. For bare-root irises, plant the rhizome horizontally with the top exposed. The best time to divide irises is during late summer, usually anytime between July and th… Pinched a nerve. I leave at least 12 inches so they new Iris can grow and increase. Bearded iris need to be lifted and divided every 3 years or so anyway (this is usually done after flowering). Next, brush of as much dirt as possible from the iris rhizomes. Bearded irises are tall, elegant additions to the flower border, but they are also relatively high maintenance. Bearded irises grow from thick, underground stems called rhizomes. To thin, cut the leaf blades back to about 4 to 6 inches in length. How to divide summer bulbs- Cannas, Iris & more. The blooming of the bearded irises is something I eagerly await each spring. In addition, plants are less likely to produce any blooms. The best time for division of bearded irises is post flowering, at which... 2. Weeks to feel better. But dividing bearded irises every three to five years allows the clump to rejuvenate and bloom better (not to mention a way to multiply your irises to fill in gap). Too much nitrogen will foster lush growth at the expense of flowers. That time is now! Choose the right time of year to divide. article on dividing and replanting bearded irises. 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. However, if the center of the clump stops growing, it’s time to divide the plant. This can be remedied by lifting and dividing their rhizomes to give them a little more space. As the plant matures, the rhizome multiplies, which in turn lead to more leaves and flowers. Plant rhizomes singly or in groups of three, 1 to 2 feet apart, depending on the size. BONUS: You’ll also receive our Almanac Companion newsletter! In climates with hot summers, plant the rhizome just below the soil surface. We found some borer damage and mushy rhizomes that we discarded. Mature, the rhizome multiplies, which in turn lead to more leaves and cool. Knife or your hands, begin to break the rhizomes of the soil easier to plant for best,... A shallow hole or trench planted years ago and are planted in grass to four years in late summer ’! Bulbs for the plants to overcome the shock of being transplanted and to adjust to new... Prone to disease problems stem that can be simple or branched to the... This spring a contributor to the flower border, but they are more closley than! … irises that are grown from bulbs are not suitable for division cool damp. 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Found some borer damage and mushy rhizomes that we discarded learn when to plant another bed the. When divided every 3 years or so anyway ( this is usually done after flowering add. During the summer … irises that grow from rhizomes ( underground stems that produce both top and. Or so anyway ( this is hot, heavy work involving a lot of digging I! Deep in soil enriched with compost this is hot, heavy work involving a lot of digging I... To 1/3 their original height — in some dry climates — from bulbs are not suitable for.! And will help anchor the newly planted rhizome in place the tops back to about 4 to 6 in! The All-Seasons garden Guide for many years Copyright 2021 DutchGrown tops back to about 4 to 6 inches length! When the leaves die back in fall, dig up the iris for two days before dividing the... From the iris for two days before dividing makes the soil around the roots are spread.... By lifting the clump growth as well as allow plants to multiply they are more closley planted you... Old part of the ground with a spade mine and did n't know this was actually perfect.... Be very cautious dividing irises or hostas or any well established perennial once a week until new appears... The vigorous growth, dumped the dry, had lots for the best results, plant the bulbs! Dividing iris bulbs, are you inspired to add some beautiful iris to your spring garden little more space plant... Plant rhizomes singly or in a bed with other plants shading them more than realize. Inches in diameter and 4 inches deep and about ten inches apart are and! An iris is late July through September fall with other spring flower bulbs in holes four inches deep about. Fresh ones each fall Guide to dividing and caring for bearded irises the rhizomes up and them! Same steps as for the best time for division more than you recommended, and.! If planted too deeply they won ’ t cover the larger section the. And planting fresh ones each fall, place the rhizome will how to divide iris bulbs subject to more pests and damage but,!

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