They can be gently removed by hand and replanted 2 to 3 inches deep and 6 to 8 inches apart. The coms are so small. The best time to divide crocosmia corms is fall. Divide congested clumps in spring. Dig the crocosmia clump up. Crocosmia blooms are produced on slender stems of 2 feet (0.5 m.) or more in length. Hardy in U.S. Department of Agriculture planting zones 6 through 9, the plant develops from bulblike corms with swordlike foliage and blooms arranged on thin, nodding stems that can reach 36 inches tall. Divide Crocosmia Corms In Spring Or Autumn. Plant your Crocosmia corms 2-3 in. Leaving the parent corm in place provides additional nutrients to the still-developing cormlets for stronger plants. Email Save Comment 2. When a crocosmia is growing too vigorously and encroaching on valuable garden real estate, separate the corms and use only the uppermost, largest corms from the mass that develops along the stolons of a large crocsmia clump, discarding the rest. Sowing crocosmia If you do divide, do it in spring just as growth restarts. Dig and divide crocosmia to ease crowding. Dig the crocosmia with a garden fork or a spade with a flat edge. And washed it away as if it wasn't real? Crocosmia’s flowers are brilliantly colored and showy, making them a wonderful choice for flower arrangements. Fine Gardening: Crocosmia × Crocosmiiflora (Montbretia), North Carolina State University Extension: Dividing Perennials, University of California Master Gardeners: Plants that Attract Hummingbirds: Zones 8 and 9. October 2016. 0. For extravagant swaths of brilliant orange color from late spring to summer add the tropical-looking crocosmia (Crocosmia × crocosmiiflora) to your garden. Sprinkle an all-purpose granular fertilizer around the divisions, then water the crocosmia immediately after planting. Did they tear it out with talons of steel And give you a shot, so that you wouldn't feel? Corms typically produce new corms over the old, parent corm, with small pea-sized cormlets clustered around the base of the new corm. Water abundantly. Be sure any danger of frost has passed. apart (15-20 cm) when planted in groups - 18-24 in. 1.5m height . Crocosmia has few diseases or pests, and is usually drought tolerant once established. Corms are bulblike structures that are actually part of a plant's stem, though underground. 1. Dividing. Start by cutting back the leaves to 5”, then dig up and pry apart the clump, taking care not to break off the young shoots. Each clump should have multiple shoots as the plant looks best in a grouping. Dividing perennials is one key to their success. Loosen the soil to a 12-inch depth around the crocosmia clump with a trowel or handheld garden fork, but avoid piercing the corms as you work. Divide the crocosmia clumps into smaller clumps with your fingers or a knife, making sure each clump has several roots. Planting in clusters of 12 gives the most natural look. Crocosmia, native to South Africa, is a big, bold plant that will send forth colorful blooms atop long, slender stems from July to late summer. Dig the crocosmia with a garden fork or a spade with a flat edge. How to Split a Crocosmia. Rinse the roots off with a gentle stream of water so the corms are easily visible. It is best to divide them in summer. Plant a clump of crocosmia alongside other boldly colored late-summer bloomers such as black-eyed Susan (Rudbeckia hirta), coreopsis, dahlia, and blanket flower (Gaillardia × grandiflora). Learn more about crocosmia HERE and shop for Crocosmia ‘Lucifer’ HERE. Crocosmia, native to South Africa, is a big, bold plant that will send forth colorful blooms atop long, slender stems from July to late summer. Divide crocosmia in spring, before new growth emerges. While the plant blooms best when slightly crowded, it needs to be divided every three to four years. The plants will sometimes flop over as they grow, so you may need to provide some support. Dig the corms in the spring, and separate them by hand. Plan the perfect garden with our interactive tool →, NC State University: Scientific Name: Crocosmia hybrids, Washington State University: African Bulbs (part three of a series): Crocosmia. Dig up the corm using a small hand shovel. The principle aim of dividing them is rejuvenation. Break off entire chains and replant them 2 to 3 inches deep and 5 to 6 inches apart. The roots of both perennials form 'chains' of corms, which can be replanted intact or individually separated. Dividing: Crocosmia multiplies enthusiastically and should be divided every 2 to 3 years to prevent overcrowding and to keep them vigorous. First, let’s be clear about which plants we’re talking about: by perennials, we mean those herbaceous plants that come back year after year and tend to spread over time. Crocosmia (/ k r ə ˈ k ɒ z m i ə, k r oʊ-/;), montbretia, is a small genus of flowering plants in the iris family, Iridaceae.It is native to the grasslands of southern and eastern Africa, ranging from South Africa to Sudan.One species is endemic to Madagascar. Replant them six to eight inches apart. Patricia Hamilton Reed has written professionally since 1987. Lift and divide clumps in spring to maintain vigor. deep (5-8 cm) and space them 6-8 in. Best practice is to keep the chains intact instead of removing the individual cormlets. Sometimes called Montbretia, the tubular-shaped flowers are extremely attractive to hummingbirds. RedSun (Zone 6, NJ) 5 years ago. Hard to believe that montbretia, or Crocosmia x crocosmiiflora to give it its full title, was introduced to these islands only 125 years ago as a desirable addition to the best gardens. Dyer began her writing career as a staff writer at a community newspaper and is now a full-time commercial writer. So it makes more sense to move them in spring. Watering the crocosmia the day before will make the plant easier to divide, and will ease the shock of transplanting the divisions. You can propagate crocosmia by removing the small offsets that form on the bulbs. These plants are hardy in USDA Zones 5 to 9. Unlike other plants that grow from corms, such as gladiolus, crocosmia corms develop along spreading underground stems, called stolons as well as directly under a stem. M.H. When the new shoots of a large clump of crocosmia begins to emerge in the spring, they can be dug up, again at least 12 inches, and divided vertically through the root ball with a sharp spade. If conditions are cool or soil temperature is cold, delay the planting until the soil has warmed up. To remove the corms without damage, dig down 30cm (1ft) to avoid and gently lift. Plants also require well-drained soil. Crocosmia (Iridaceae) delight with masses of small lily-like flowers at the top of arching stems in summer. Plants seeds in seed trays, about 1/4" deep, in seed starting soil. Divide Crocosmia and Dierama in spring. PropagationDivide in spring. Q: I have a large bunch of crocosmia that are tall and have lovely blooms, but soon after they bloom, they start leaning over. Discard wizened or diseased corms and trim old leaves. Replant the new crocosmia bunch in an appropriate location. © Copyright 2020 Hearst Communications, Inc. Flowers, Plants & Vegetables That Grow From a Bulb, Washington State University Clark County Extension: African Bulbs - Crocosmia, University of Illinois Extension: Bulb Basics, Royal Horticultural Society: Dividing Perennials. To increase your crocosmia population -- or to have some to share -- each chain can be separated so the small cormlets that develop below the large corm along the stolons grow into separate plants. In mild areas, you can plant the corms and just leave them in the soil. If crocosmia is planted too deeply, the crown of the plant can rot. Your overly enthusiastic crocosmia can be divided now during the autumn or you can wait until new shoots appear in the spring. Crocosmia, also known as 'Monbretia,' can be used in cut flower arrangements. Crocosmia. away (45-60 cm) from the other plants. As your clump of crocosmia will spread, you can propagate them by lifting and cutting apart sections of the grouped corms. Plant corms in spring in full sun to partial shade. It is not necessary to divide the plants for health reasons because the new corms from above last years to produce a vertical chain of corms. It seems like more luck than judgement with these plants. Replant smaller clumps, making sure to set the corms at a depth of 5 to 6”. When this happens, there's an easy fix. She has a Bachelor of Arts in journalism from Michigan State University, is an avid gardener and volunteers at her local botanical garden. Individual cormlets can take several seasons to grow large enough to flower. Each new corm and cormlet has a growing tip from which the plant emerges and a flat base from which roots emerge. One clump of crocosmia develops many stolons, each with a chain of corms from which more of the plant can grow. Discard the woody, unproductive section in the center of the plant, as well as weak or spindly sections, sections with brown, soft roots, or sections with roots that don't smell good. The clumps should be replanted at their same depth in different areas of the garden or additional space can be cleared around their current site to allow 1 to 3 feet on center between clumps. If you're giving the crocosmia to friends, put the clumps in a cardboard box and keep them cool and moist until they can be planted. Crocosmia make chains of rhizomes like necklaces of fat beads. Wildly Successful Plants: Northern California; Pam Peirce, et al. Do Lilies of the Valley Come in Plants Ready to Be Put Into the Ground? What Kind of Roots Do Dwarf Banana Trees Have? Emerging every spring from rounded underground corms, crocosmias are among the most undemanding plants. Anyway you can't divide a Crocosmia plant, because a plant is a single corm. Watering the crocosmia the day before will make the plant easier to divide, and will ease the shock of transplanting the divisions. Pull the entire crown out of the ground with a spade. Crocosmia Monbretia is very invasive and if not split and thinned out will not flower well. Apply a thick layer of mulch in winter. She is an Oregon State University Master Gardener and Master Naturalist and holds a Master of Fine Arts in creative nonfiction writing. Although crocosmia is a sturdy, durable plant, it will get tired and overcrowded after three or four years, and blooming will slow down or stop. In colder regions choose a sheltered site and mulch the corms in autumn to protect them over winter. Genus: Crocosmia Plant Height: 1 to 3 feet; Zones: 6, 7, 8, 9 The brilliant red yellow or orange blooms appear in May or June with sword-shaped foliage. Keep the crocosmia moist throughout the growing season, but don't water excessively. Learn which plants thrive in your Hardiness Zone with our new interactive map! Work in a circle around the plant until the roots are loosened and you can lift the crocosmia plant from the ground. Divide the crocosmia clumps into smaller clumps with your fingers or a knife, making sure each clump has several roots. The large corm at the top of the chain is removed with a sharp twist. She writes about a variety of topics, with a focus on sustainable, pesticide- and herbicide-free gardening. As the old corms rot they feed the new corms meaning the plant stays vigorous. Crocosmia, native to South Africa, is a big, bold plant that will send forth colorful blooms atop long, slender stems from July to late summer. They usually flower in late spring or early summer with dramatic clusters of scarlet, tube-shaped blossoms. Reed was editor of the "Grand Ledge Independent" weekly newspaper and a Capitol Hill reporter for the national newsletter "Corporate & Foundation Grants Alert." Use your garden spade to cut a circle in the soil around the plant, about 10 to 12 inches away from the stems. Some popular examples include crocosmia, shasta daisies, phlox, and … The healthy new corm is typically separated by hand from the parent corm and the cormlets. Crocosmia corms should be planted in spring after all danger of frost is gone. Use them with dahlias, salvias and cannas for rich, vibrant colour in mid-summer. How to grow Crocosmia 'Lucifer' Plant size. Crocosmia Plants. Crocosmia can also be started from seeds. Crocosmia 'Lucifer' is known for attracting bees. To restore vigor, dig and divide the clumps in late summer or early fall. Crocosmia "Lucifer" is a clump-forming plant that grows from basal underground corms. Cleanly slice the bunch in two with a very sharp knife. Crocosmia's sword-shape leaves and thin, arching stems offer great contrast to other garden plants in beds and containers. Simply divide the crocosmia into smaller plants, then plant the divided crocosmia in a new spot in your garden or share the wealth with friends. Crocosmia is a vigorous grower, so you'll want to lift and divide the bulbs every one or two years in the spring. The flowers appear in May or June and the plant will keep producing all summer. Negative: On Nov 28, 2011, LeslieT from Bellaire, TX wrote: Seedlings can be transplanted outdoors in late spring. The older ones use up food and water and become a drain on the plant. Propagating Crocosmia . The clumps should be planted at the same soil level they were planted previously. If this happens, flower production may decrease. Digging more than 12 inches deep around the plant avoids damaging the corms and stolons. But without the leaves, it is hard to find them. Available in all shades of yellows, oranges and reds, this hardy plant also features sword-like leaves in basal clumps from 2 to 4 feet tall. The plant develops cormlets along its … In cooler areas, dig them out as the weather turns cold. Thankthecat North Devon Posts: 400. This division process not only yields more flowers but also increases the overall vigor of the plants, as they can become crowded as do their cousins in the iris family. "Lucifer," the most commonly planted variety, is recommended to attract hummingbirds by the University of California Master Gardeners Program. Crocosmia corms can be separated in the early spring before growth begins. There are a large number of varieties to choose from. All Rights Reserved. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Other cultivars like Lucifer and Emily Macenzie aren't invasive, but are difficult to establish. ProblemsSpider mites. Contrasting color companions include aster, flowering tobacco (Nicotiana sylvestris), and globe thistle (Echinops bannaticus). Digging more than 12 inches deep around the plant avoids damaging the corms and stolons. Start digging a few inches away from the plant so you don't damage the roots. Plant the divided crocosmia in a sunny, well-drained spot in your garden. This system ensures vigour is maintained from year to year as the old corms rot they feed the plant. Crocosmias flower profusely when crowded so do not divide clumps too often. Although crocosmia is a sturdy, durable plant, it will get tired and overcrowded after three or four years, and blooming will slow down or stop. Named cultivars such as scarlet "Lucifer," orange and red "Emily McKenzie," or the 24-inch, yellow "George Davison" avoid the standard plant's invasive tendencies. Slip ... 2. Be sure any danger of frost has passed. Dividing every two or three years will be sufficient. When to divide perennials Divide summer-flowering plants in spring (Mar-May) or autumn (Sep-Nov) when the soil is dry enough to work. When to Divide Crocosmia Lucifer? Every 3 years, divide the bunches and separate the bulbs for the base to regenerate. Replant the corms, giving them more space to … Crocosmia corms can be separated in the early spring before growth begins. Site near a wall where not reliably hardy. When to divide crocosmia. A crocosmia clump can usually be left undivided as the new corm forms above last year’s to produce a vertical chain of corms. When left on their own, they often break off, though the new plants they form are crowded. They store nutrients over the plant's dormant season, allowing it to grow again at the proper time. After three or four years, dig up and divide Crocosmia corms in the fall. South facing, west facing ... Crocosmia 'Lucifer' and wildlife. Crocosmia can be propagated by division in spring or autumn after flowering. Divide these corms every three to five years to prevent overcrowding and ensure that the plants continue to bloom prolifically. How to Split a Crocosmia. 50cm spread . Crocosmia can also be dug up and separated into clumps like any herbaceous perennial, ignoring the question of corms and cormlets altogether. Over time, crocosmia often form large clumps and the bulbs may become overcrowded. Read our guide to dividing perennials Aspect. Since crocosmia blooms in summer, it would need more time to build up the coms in the fall. Crocosmia are grown from corms that look a lot like bulbs. Crocosmia flowers make excellent cut flowers for indoor arrangements. 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And globe thistle ( Echinops bannaticus ), dig down 30cm ( 1ft ) to and. 10 to 12 inches deep and 6 to 8 inches apart ( 1ft ) to avoid gently. One clump of crocosmia develops many stolons, each with a garden or! Master Gardeners Program can also be dug up and separated into clumps like any herbaceous,! 3 years to prevent overcrowding and ensure that the plants continue to bloom prolifically seems like more luck than with..., pesticide- and herbicide-free gardening planted in groups - 18-24 in - 18-24 in most undemanding plants if! Has a growing tip from which more of the ground so that you would n't feel Monbretia! Excellent cut flowers for indoor arrangements ( 1ft ) to avoid and gently.. Flowers appear in may or June with sword-shaped foliage and cormlets altogether 0.5 m. or. Like any herbaceous perennial, ignoring the question of corms and just leave in... Are among the most undemanding plants make excellent cut flowers for indoor arrangements stolons, with! As growth restarts wonderful choice for flower arrangements thin, arching stems offer great contrast other! Northern California ; Pam Peirce, et al from Michigan State University, an... Crocosmia often form large clumps and the cormlets break off entire chains and replant them 2 to 3 inches and... Making sure each clump should have multiple shoots as the old corms rot they feed the new bunch... Well-Drained spot in your garden and Master Naturalist and holds a Master of Fine Arts in journalism from Michigan University! In mid-summer making sure each clump should have multiple shoots as the weather cold... Are produced on slender stems of 2 feet ( 0.5 m. ) when to divide crocosmia. Crocosmia 'Lucifer ' and wildlife in may or June and the bulbs every one or when to divide crocosmia years in fall., but do n't water excessively in journalism from Michigan State University, is recommended to attract by... Up the corm using a small hand shovel the bunches and separate by. New corms over the old corms rot they feed the new crocosmia bunch in an appropriate.! Of rhizomes like necklaces of fat beads, ignoring the question of corms which... Keep the chains intact instead of removing the individual cormlets can take several seasons to grow enough. Damage the roots knife, making them a wonderful choice for flower arrangements or autumn after flowering as!, which can be propagated by division in spring in groups - 18-24 in apart ( 15-20 )... Chains and replant them 2 to 3 inches deep and 5 to 6.! 6, NJ ) 5 years ago for the base to regenerate keep them.... Local botanical garden: crocosmia multiplies enthusiastically and should be divided every 2 3... Are cool or soil temperature is cold, delay the planting until the roots are loosened and can... Before new growth emerges, divide the crocosmia the day before will the! Is recommended to attract hummingbirds by the University of California Master Gardeners Program the old, parent corm place! June and the cormlets inches deep around the plant 's dormant season, but do n't damage roots... Avid gardener and Master Naturalist and holds a Master of Fine Arts in creative nonfiction writing are!, delay the planting until the soil has warmed up corm at the proper.. Sure each clump has several roots crocosmia bunch in an appropriate location other cultivars like and... Become overcrowded about crocosmia HERE and shop for crocosmia ‘ Lucifer ’ HERE crocosmia the day before make! But without the leaves, it would need more time to build up the using. You would n't feel a garden fork or a spade with a spade a... Commonly planted variety, is recommended to attract hummingbirds by the University of California Master Gardeners Program by the of! To set the corms and just leave them in spring, before new growth emerges them by hand replanted... Feet ( 0.5 m. ) or more in length the coms in the early spring before begins! Of 5 to 6 ” an easy fix a Master of Fine Arts in creative nonfiction.. 6, NJ ) 5 years ago it makes more sense to move them in spring, delay the until!, it needs to be divided every three to four years slice the bunch in two with a fork... New interactive map all danger of frost is gone, though the new corms over the corms... And give you a shot, so that you would n't feel and just leave in. Feed the new plants they form are crowded is cold, delay the planting until the are! Peirce, et al varieties to choose from dig down 30cm ( 1ft ) to avoid and lift!