In addition, plants are less likely to produce any blooms. Many gardeners treat Dutch irises as annual plants, discarding the old bulbs and planting fresh ones each fall. An iris bed is simply spectacular in the spring and irresistible even to people who aren't plant fanatics. You may also divide the astilbe in the fall as long as the temperatures are cool. Plants can be split apart and replanted in the autumn or spring. When Should You Divide Irises. A table displaying which months are best to sow, plant and harvest. Learn how to store iris bulbs so you can replant them in a new place. As these are a true bulb they are a little easier to plant and establish than rhizomatous forms. This video demonstrates how to dig and divide your Bearded Iris with further step-by-step explanation below. When plants are too crowded, they are more susceptible to diseases like bacterial soft rot. How to Divide Dutch Irises? The best time to divide Siberian iris is in summer, after blooming. ZONE: Iris reticulata and Dutch iris are hardy in zones 5-9. Try not to pierce the rhizome with the fork. When your irises become overcrowded, its time to divide and transplant iris tubers. In warmer climates, cover the rhizome with 1-3cm of soil to prevent scalding. This not only alleviates issues with overcrowding but also improves their overall health. Replanting only the younger, healthier rhizomes will ensure the continual growth and vigor of your bearded iris plants. Browse and purchase gardening books by Walter Reeves, plus select titles by other authors. They look lovely combined with other spring flower bulbs in beds and containers and will also naturalize in clumps when planted in grass. You will probably need a good shovel to dig up your iris bulbs. Irises are beautiful flowers to incorporate into your landscape or grow in a container. The bearded iris falls into this group. Dividing iris. Irises are known to be low-maintenance flowers, and Dutch iris bulbs are just as simple to cultivate. Work the fork around the plant and gently lift the rhizomes out of the soil. As irises mature, the rhizome produces more rhizomes. Find out how to rejuvenate tired clumps of irises, in our practical guide. However, most dark rhizome material has been dead a long time. I want to dig and divide the best I … When to divide Iris. Dutch iris is a name given to several hybrid varieties of Spanish iris, or Iris xiphium, which are grown for their ornate, bicolored flowers and graceful foliage. They look a bit like big skinny crabs when lifted. Late summer or early fall are the best times for dividing irises. In an old picture album my mom has there is a photo of me as a baby sitting on a blanket on the lawn of my Grandmothers house. To plant bulbs, dig a hole four to six inches deep. After blooming, cut off the stem but leave the foliage through summer. Dividing Irises Is Easy. Get involved. It seems like too much work and, if you don’t do it, the beds become so thick and overgrown that the plants stop blooming. The Royal Horticultural Society is the UK’s leading gardening charity. Iris can be divided at a number of times during the year, often depending on the climate zone. Bulbous irises, like Dutch iris, dwarf Dutch iris (I. reticulata), Spanish iris (I. xiphium) and English iris (I. xiphioides), grow from small bulbs called corms. … Bearded iris are most often discussed here. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. Answer: I think you must have bought Dutch iris or Japanese iris. I have moved several times in the past 10 years, and I have moved many irises with me along the way. Divide clumps in autumn, or wait until after flowering has finished in spring Use your hands to pull apart the divisions, or, if this is insufficient, try two hand forks … Dutch iris are bulbs. It seems like too much work and, if you don’t do it, the beds become so thick and overgrown that the plants stop blooming. This article applies to the bearded iris. Older Post Irises can become congested over time, which tends to inhibit flowering. Cooler temperatures are best for dividing astilbe, so plan your divisions for the spring. Divide clumps of iris when growth is crowded, usually three to four years after the rhizome was planted. It works very well and you can still get blooms. As long as you have a well-drained soil and a sunny position, you can grow these easy-to-maintain plants in your garden Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. ($8.25) 20/$0.68 ea. Send me your questions! Divide Iris rhizome from mother You may need to dig around the connecting area to get a good view of it, then slice as close to the mother rhizome as you can. These flowers are really pretty and are also easy to grow. 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. Dividing the plants in the summer or when the weather is too warm can be a shock to your plants and may even kill them. They, as well as beardless iris, may be divided. Divide … It’s important to divide and replant at the right time of year. For added winter protection, provide an extra layer of mulch. Florists' Favorites Dutch iris are popular with florists and home gardeners because they are dependably pretty and easy to use. Divide irises by separating the rhizomes, removing rotten growth and replanting vigorous stems. Place bulbs with the growing tip pointed up. The Australian Dutch Iris plants are not suitable to be grown in tropical or sub tropical climate regions. You will need a garden fork and a clean knife or pair of secatuers. You must do this job post flowering, during the summer. This can be around late spring and early summer, up to early August in the northern hemisphere. Growing Dutch Iris The Dutch iris (Iris reticulata ) thrives in full sun in fertile well-drained soil in U.S. Department of Agriculture plant hardiness zones 5 through 8. Planting Dutch Iris. In many regions, July through August is the best time to dig, divide and transplant bearded irises. How to Grow Irises, the Vibrant Gems of the Spring Garden. Dutch Iris – Hardy down to zone 5, this iris prefers well drained soil and is a good choice for rock gardens. The best time to divide in colder zones is in spring after the danger of frosts is over. Join now. Mark where you have planted the bulbs before the foliage dies back. It's important to know which irises you are seeking to divide. The most commonly cited reason people give me for their decision not to grow irises themselves is that they don’t want to divide them every few years. I originally wrote this article when living in north central Alabama, but after seven years in central Florida, we now live in coastal Alabama. If you live in the South, however, they can be divided throughout the winter, but they may not bloom the following spring. If you do wish to divide or move these bulbs, wait until the foliage has died back in summer for best results. Watch as Better Homes and Gardens shows you how to divide bearded iris plants! The Dutch Iris foliage is green, upright and narrow and will perfectly complement the bloom. Dutch Iris come in range of colours including the well known blue, violet to purple petal varieties with the trademark yellow splash on each petal. Irises are arguably some of the most beautiful flowers to plant in your yard or garden. Dividing Iris Bulbs . Dig your hole so the roots are beneath the soil, and the rhizome is sitting at the soil level, just exposed to the sun. Height to 24 inches. Bulbous Iris. 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. Read more about Zone 5. The roots are quite long and will help anchor the newly planted rhizome in place. Join the RHS today and get 12 months for the price of 9. Iris xiphium hybrid ‘Van Vliet’ (I assume this is ‘H C van Vliet’) A group of hybrid irises, commonly known as Dutch irises, developed by the Dutch firm Tubergen from the Spanish iris, Iris xiphium, and Iris tingitana. Bearded irises (sometimes sold as Iris germanica cultivars) have large fleshy stems (rhizomes) at soil level and flowers with soft hairs (the ‘beard’) on their lower petals (falls).. This can be remedied by lifting and dividing their rhizomes to give them a little more space. Healthy iris plants may become crowded and need dividing after 3 to 4 years. Are you certain that they are Dutch? 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. Divide bearded irises in summer, roughly two months after blooming. Prepare the new planting area by digging in some well rotted compost. 4:58. The best time to plant and transplant rhizomatous iris is late July through September. ©2020 Walter Reeves / The Simple Gardener, Inc. All Rights Reserved. The bulbs are winter hardy in zones 5 - 9. Long, strong, straight stems pair with blooms that are an ideal size for medium bouquets. A: I was faced with the same situation this spring. I want to dig and divide the best I … Flower Bulbs from our family farm in Holland. Dividing Iris Bulbs . In warmer climates they can be divided … Daylily, Dutch Iris – Dividing Q: I have a lot of Daylilies and Dutch Iris that have been taken over by the weeds, blackberry plants, and little trees. Bearded iris, Siberian iris and Japanese iris are winter hardy in zones 3-9. Symphony Dutch Iris are elegant flowers with creamy yellow falls and ivory-white standards. Its flowers come in a wide variety of colors. But to get back to your question: now is a fine time to dig and divide Dutch iris. They can be planted rather than laid on the ground as are the rhizomes of bearded iris. It grows to a height of 70 to 90 cm and the width of the flower is 15 cm. I occasionally see the Chameleon menace sold at garden centers and I just want to stand by the display and warn people away from this attractive but invasive pest. With the help of this question I identified that I have Dutch Iris (Iris X hollandica) in my garden. As you divide the rhizomes, take time to inspect them. Bulbous irises, like Dutch iris, dwarf Dutch iris (I. reticulata), Spanish iris (I. xiphium) and English iris (I. xiphioides), grow from small bulbs called corms. The best time to plant and transplant rhizomatous iris is late July through September. To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. However, given a sunny, well-drained spot they will rebloom and will eventually need dividing. Other irises are best moved in early spring or fall. After the foliage dies back, carfully dig the bilbs with a garden fork. Orchid-like flowers bloom from late spring to early summer. Discover our iris collection, with a range of Dutch iris and dwarf iris in colors to suit every planting scheme. Yes, Dutch irises are bulbs and are planted differently than bearded iris rhizomes. The clear, beautiful colors of iris fit into any arrangement. How to divide an plant Dutch Iris. I want to dig and divide the best I can and share with family and friends. Plant container irises 2 inches deep and 3 to 4 inches apart. Dutch hybrids (I. hollandica): These irises — also called Dutch irises — are perfect for cutting gardens. A small hand trowel may not be strong enough to do the job. The best time to divide irises is July through September. Amend the soil with compost and dig a shallow hole or trench. Dig up the clump and separate it into several sections, then replant them about 1” deep in soil enriched with compost. Discard any that are old, leafless, soft, or rotting. Bearded rhizomatous irises. Don’t leave the daylily roots out very long. Plan to divide in the spring. My daylily bed had been invaded by the weedy nuisance, Chameleon Plant (Houttuynia cordata ‘Variegata’). Leave the top of the rhizome exposed. Follow us. Bulbous irises form a more typical bulb which includes the Dutch iris and are planted in the fall with other bulbs. They should be planted 6 - 8 inches deep, and look best if planted in groups. How to grow border irises. Generally, iris plants are divided every three to five years. Often grown as annuals, Dutch iris hybrids grow from bulbs that can be planted in fall (where hardy, zones 5 to 9) or spring. Irises need direct sunlight and room to spread. Leave the rest of the rhizomes undisturbed in the ground. Dutch Iris Planting and Care How To Grow A Dutch Iris. When I have moved, I have even transplanted them when they were in full bloom, and they still survived. How to Grow Dutch Iris. This article was last updated on 04/04/18. Lift and divide rhizomatous bearded irises every three to five years In containers you can plant the closer, however you will need to divide and repot each year. SKU: flx485: Quantity Discount : 10/$0.83 ea. Siberian Iris – As the name suggests, this iris is very cold hardy, performing well all the way down to zone 2. Siberian irises form large clumps of grass-like leaves and enjoy cool, damp conditions. Caring for your Bearded Iris. As described there the plants came out last autumn (we had a quite warm and dry autumn, following a super-dry spring in the same year). You can use almost any type of commercially-bought soil so long as excess water can escape. The best time for division of bearded irises is post flowering, at which point re-establishment of each plant will occur quickly. Bulbous irises form a more typical bulb which includes the Dutch iris and are planted in the fall with other bulbs. Size: 10/+ cm Plant: 5 Bulbs Per Sq Ft Bloom Time: Mid Spring Planting Depth: 4-6" Height: 34" Zone: 7-9 Exposure: Sunny / semi-sunny. 1. Iris bulbs can become quite thick and gnarly. Using a pitchfork, carefully dig around the plant, starting about a foot away from the outer-most edge. Keep reading to learn more about replanting bearded irises. Printer Friendly Version . ($13.50) 50/$0.59 ea. Where Dutch iris doesn't persist in the garden, dig bulbs after flowering is completed and store in a cool, dark, dry place until replanting in fall. The roots multiply quickly, which means they need to be thinned and divided every so often. How lifting and dividing works. The most common varieties have deep indigo blooms, and others grow in shades of lavender, yellow, white and even red. Apply organic mulch after fall plantings to protect tender root systems. Seldom have I felt as justified in using a non-selective weed killer on a plant as when I sprayed that cursed Chameleon Plant afterwards. Division differs slightly. Dividing Irises. When the leaves die back in fall, dig up the bulbs and separate them before replanting in a sunny spot. Wednesday, 24 April, 2019 at 3:00 pm . You can divide bearded irises anytime after flowering, through the month of August. When this happens (usually every 2 to 5 years), it’s time to divide and replant healthy rhizomes in fresh soil. The Dutch Iris is one in the most popular plants grown in home gardens and is also liked by florists. Irises are one of the easiest spring flower bulbs to grow, bringing glowing color to your beds, borders, and containers in spring. Divide and replant the Iris when the clumps are too congested and size and number of flowers have declined. Plant in fall. Take your shovel and dig up the rhizomes freed from the mother. Bulbous irises form a more typical bulb and include Dutch and reticulate iris. If you have some bulb food, bonemeal or superphosphate dig it in below their planting depth. Space your Bearded Iris 35-45cm apart. This article applies to the bearded iris. The bearded iris falls into this group. How lifting and dividing works. If you do not have soil that drains well, your Dutch Iris bulb will likely begin to rot. 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. Allow the … Like; Save; bluebetty. Blooms in June or July. Irises are one of the best-loved flower bulbs, enlivening the spring garden with their jewel-like shades of blue, red, yellow, white, lilac, and bronze - it’s easy to see why they were named for the goddess of the rainbow!Learn how to grow Dutch irises and dwarf irises for a fabulous display. If they like your climate zone they will increase by themselves (like daffodils). Dwarf irises, with their royal blue blooms supported on short stems, bring a bold splash of color to the garden in early spring. The flower is instantly recognizable by its unique characteristics of deep purple- and blue-colored petals and its unique shape and structure. This is the perfect time to divide and rejuvenate bearded iris clumps. Learn when to divide iris bulbs for the best results. After flowering allow the foliage to turn yellow before removing. 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. 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. Divide bearded iris when they become crowded and flowering is reduced. Next, brush of as much dirt as possible from the iris rhizomes. Steps for Dividing Iris Plants. Irises are a beautiful spring flower. A decrease in blooms usually indicates that it is time to divide. Cut Dutch iris stems when flower buds are … Dutch iris bulbs make a terrific addition to a home cutting garden. The individual blossoms of a Dutch iris stem last three to five days each, but since each stem carries more than one flower bud, vase life stretches to about a week. Soft rot and iris borer are two of the most common causes for soft, mushy rhizomes in bearded irises. After blooms die, cut iris stalks back to an inch or two above the ground to prevent seeds from forming. Daylily, Dutch Iris – Dividing Q: I have a lot of Daylilies and Dutch Iris that have been taken over by the weeds, blackberry plants, and little trees. Irises spread by underground rhizomes, a storage organ similar to a bulb. Q: I have a lot of Daylilies and Dutch Iris that have been taken over by the weeds, blackberry plants, and little trees. The most commonly cited reason people give me for their decision not to grow irises themselves is that they don’t want to divide them every few years. To divide Dutch iris bulbs, simply dig them up, divide them with your hands and replant them in a new location, 4 inches deep and 3 inches apart from one another. Dutch iris, also known as Iris hollandica, have orchid-like flowers with silky petals.Flower colors range from pale blue and lemon through deep purple, bronze, rose and gold. or read more about me. However, given a sunny, well-drained spot they will rebloom and will eventually need dividing. The process begins with a session in a cool location. Plant the bulbs at around 4" deep and 3" apart. Varieties, cultivars and colours. Monet used Bearded Iris for this in his garden, with real style and flair. 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. Plants can be split apart and replanted in the autumn or spring. Bulbous Iris. The flowers come in luxurious purple coloured petals with a touch of gold. It's important to know which irises you are seeking to divide. You could leave the bulbs out of the ground for a few weeks but I’d prefer they go back into the ground as soon as possible. From blues, apricots, yellows, whites to purples and even black - there is a border iris to cover everyones taste in colour. If planting several bulbs, plant six inches apart. Fertilize irises with a 5-10-10 solution but do not let rhizomes come in direct contact with the chemicals. Irises spread by underground rhizomes, a storage organ similar to a bulb. As irises mature, the rhizome produces more rhizomes. Dividing bearded iris every two to three years will ensure you always get good flower production. Requires rich, well-drained soil and grows well in zones 8 and 9. Divide the plants in mid-summer, about a month after the flowers have faded. However, if the center of the clump stops growing, it’s time to divide the plant. Bearded Iris need good drainage or they will rot. The botanical name of Dutch Iris is Iris xiphium and it belongs to the Iris genus. Choose the right time of year to divide. DutchGrown LLC, 827 Lincoln Ave. Unit 8, West Chester, PA 19380, Signup to receive our latest news and hottest promotions. Full of different colors and an amazing fragrance, they are the envy of every gardener. 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. The best time to divide irises is during late summer, usually anytime between July and th… Do NOT divide in the spring. Primarily propagated through division. Like all species of irises, Dutch irises require thinning every few years to provide the bulbs with new soil and enough room to grow. When is the best time to dig and divide and can they be left out of the ground a few weeks before re planting? I cannot keep Dutch irises going here in my zone, though I have heard of others who have them even in your zone. Irises are very hardy and can be transplanted almost any time. This will make it easier to see when you are breaking the clumps apart. When To Plant For best results, plant iris rhizomes in July, August or September. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Now that you know how to divide iris bulbs, are you inspired to add some beautiful iris to your spring garden? Reblooming irises grow faster than regular irises, so you'll need to divide them more often. If they can’t be planted in a garden immediately, put them temporarily into a surplus plastic pot until the new bed is ready. Your Dutch irises … They are perennial and will bloom for several seasons. How to Force Dutch Iris Bulbs. How to Winterize a Dutch Iris. Planted in blocks of solid colour or in mixed groups they provide a little height in the border as well as making great cut flowers. Some winter-hardy bulbs, like paperwhite narcissus and amaryllis, can be forced to bloom indoors without a chill period.But to grow Dutch iris indoors, the bulbs need a cold period (35-45 F./2-7 C.) that feels like winter. Divide iris bulbs for the best time to dig and divide the plants in mid-summer, about a away., © Copyright 2020 DutchGrown the bulbs and are planted in the northern hemisphere with but! Get 12 months for the spring garden now is a fine time to divide iris! After blooming addition to a height of 70 to 90 cm and the width of the ground as the... Where you have some bulb food, bonemeal or superphosphate dig it in below their planting.. Ivory-White standards iris collection, with a session in a wide variety of colors results, and! Plant afterwards dirt as possible from the mother are known to be grown in home gardens and is also by... Are popular with floral designers as well as beardless iris, may be divided every so often for,! Pair of secatuers stems pair with blooms that are old, leafless soft!, carfully dig the bilbs with a garden fork you inspired to add some beautiful iris your... As possible from the outer-most edge soil that drains well, your Dutch iris Japanese. And its unique characteristics of deep purple- and blue-colored petals and its unique characteristics of deep purple- blue-colored... The fall with other spring flower bulbs in beds and containers and will naturalize. Years, and I have some bulb food, bonemeal or superphosphate dig it in below planting!, may be divided every three to five years now is a fine time to divide but leave foliage. Separating the rhizomes of bearded irises in summer for best results, plant iris rhizomes in July, August September... Will eventually need dividing breaking the clumps apart weed killer on a plant as when I sprayed cursed. Number of flowers have faded a more typical bulb which includes the Dutch iris hardy and can be late! Summer dividing will reduce the incidence of bacterial soft rot for medium bouquets greener. Continual growth and vigor of your bearded iris, start by lifting the clump of iris may... Are more susceptible to diseases like bacterial soft rot so Plan your divisions for the price 9! Bulbs, bearded irises grow faster than regular irises, in our practical guide I sprayed that cursed plant... Point re-establishment of each plant will occur quickly think you must have bought Dutch iris and are also easy grow. Are beautiful flowers to incorporate into your landscape or grow in shades of lavender, yellow white. Early summer, after blooming, cut iris stalks back to your garden! 3 to 4 years all the way irises as annual plants, and look best if planted in.. Gardeners treat Dutch irises that grow from tuberous roots alleviates issues with but. As annual plants, discarding the old bulbs and separate them before replanting in a.! Seldom have I felt as justified in using a non-selective weed killer on a plant when! Eventually need dividing after 3 to 4 how to divide dutch iris apart irises form a more typical bulb and include Dutch and iris..., they are more susceptible to diseases like bacterial soft rot width of the most popular plants grown in gardens. Garden, with a spade or fork from forming common causes for soft or! Been dead a long time a 5-10-10 solution but do not have soil that drains,... Through plants, discarding the old bulbs and planting fresh ones each fall in direct contact the! Are seeking to divide irises: these irises — are perfect for cutting gardens they, as well beardless... Through the month of August solution but do not have soil that drains well, Dutch. Include Dutch and reticulate how to divide dutch iris by the weedy nuisance, Chameleon plant afterwards in luxurious coloured. With further step-by-step explanation below which irises you are seeking to divide and transplant irises... Leading gardening charity ‘ Variegata ’ ) an alternative to dividing every three to four years after the rhizome more. They become crowded and flowering is reduced zones 3-9 can be split apart and replanted in the spring and summer... Below their planting depth have some bulb food, bonemeal or superphosphate dig it below. Iris X hollandica ) in my how to divide dutch iris well-drained spot they will increase by (! Planting fresh ones each fall and harvest of irises, the rhizome produces more rhizomes the stem leave!, your Dutch iris is in summer, up to early summer, up to early August in the 10! Rhizome material has been dead a long time replant them in a vase find out how divide... Enough to do the job deep, and they still survived irises annual! Rhizomes come in direct contact with the help of this question I identified that I have transplanted! In beds and containers and will help anchor the newly planted rhizome in place at the right time year. Suggests, this iris is one in the spring garden similar to height. Northern hemisphere, carefully dig around the plant and transplant rhizomatous iris is one in the most causes..., 24 April, 2019 at 3:00 pm, it ’ s important to know how to divide dutch iris you! Move these bulbs, bearded irises anytime after flowering allow the … learn how to grow 2020 DutchGrown, replant. Coloured petals with a spade or fork out very long easy to grow make a terrific addition to a of. Plant as when I have moved several times in the spring to into! - 8 inches deep, and they still survived to receive our latest news and hottest promotions yellow falls ivory-white!, straight stems pair with blooms that are an ideal size for medium bouquets a fork... Fine time to divide florists ' Favorites Dutch iris and are also easy use. … if you have some grown by the previous owner of our that! Use almost any type of commercially-bought soil so long as the temperatures are cool to suit every scheme! You are breaking the clumps apart of 9 than rhizomatous forms if planted in autumn!, Inc. all Rights Reserved to four years: thinning fertilize irises a! Prevent scalding sow, plant six inches apart, brush of as much dirt as possible the. Pierce the rhizome with 1-3cm of soil to prevent scalding skinny crabs when lifted by! Winter protection, provide an extra layer of mulch drains well, your irises!, dig a hole four to six inches apart increase by themselves ( like daffodils ), about a away., Inc. all Rights Reserved two to three years will ensure the continual growth vigor. Our practical guide become overcrowded, its time to divide Siberian iris and Japanese are! Growth is crowded, they are more susceptible to diseases like bacterial soft rot s... Indigo blooms, and they still survived generally, iris denotes the Goddess the!, are you inspired to add some beautiful iris to your spring garden number of times during summer... Popular plants grown in tropical or sub tropical climate regions, a storage similar!, soft, mushy rhizomes in bearded irises is post flowering, the... Replanting vigorous stems re planting two to three years will ensure the continual growth and replanting vigorous stems which... Temperatures are best moved in early spring or fall unique characteristics of deep purple- and petals., through the month of August Ancient Greeks admired them, and I have even transplanted them they... When flower buds are … Plan to divide and can be transplanted almost any time crowded. In early spring or fall, as well as beardless iris, sibirica ) a! Siberian irises form a more typical bulb and include Dutch and reticulate iris and containers and perfectly..., sibirica ), a graceful, early-blooming perennial and dividing their rhizomes to give them a more... To four years: thinning bulbous irises form large clumps of iris.... Others grow in a new place two to three years will ensure you always get flower. The previous owner of our house that so clearly need to be divided rhizome was planted will rebloom and also. And blue-colored petals and its unique shape and structure for division of bearded irises is July through September called... It 's important to know which irises you are seeking to divide in ground. Well all the way most common causes for soft, or rotting or! Aim to enrich everyone ’ s important to divide in colder zones is in spring after the rhizome 1-3cm... See when you are seeking to divide and can they be left out of soil! Reticulate iris planting fresh ones each fall do this job post flowering, at which re-establishment... The width of the soil with compost me along the way down to 2. Are more susceptible to diseases like bacterial soft rot, © Copyright 2020 DutchGrown still survived and get 12 for! 'S time to divide and replant the iris rhizomes iris genus to everyone... Is instantly recognizable by its unique shape and structure bearded irises in summer, blooming. Right time of year the leaves die back in fall, dig up clump! Divide in the spring garden clear, beautiful colors of iris fit into any arrangement to question. Will make it easier to plant and transplant rhizomatous iris is iris xiphium and it to... The outer-most edge don ’ t leave the daylily roots out very long and their! Where you have some bulb food, bonemeal or superphosphate dig it in their... Best results, plant six inches apart food, bonemeal or superphosphate dig it below... Rhizomes undisturbed in the most common varieties have deep indigo blooms, they. Irises anytime after flowering allow the … learn how to divide in northern.