Choose a planting location for the allium bulbs that will provide as much sunlight as possible. (So if you have a two-inch bulb, you would plant it four to six inches deep.) Allium sphaerocephalon. Hardiness H6 Planting Period September to November Soil Type Any well drained Location Sun / semi shade Planting Depth (cm) 8 to 10 Flowering Period From July to August Height (cm) 65 Flower Size (cm) 6 Flower allium ostrowskianum height 2014 関東大会結果について スクォートクラスに関してのお知らせ 年間ランキング一部修正しました 年間ランキング途中経過の発表について 活動報告 2018年第四戦 四国大会の結果発表 リザルト（2017年第1 It is native to dry slopes, steppes and plains ranging from the Caspian Sea to southwestern Siberia, central Asia and northwestern China. Miami has stylish half-spherical heads that are fairly open revealing masses of small red-purple flowers. This helps with root and bulb formation and will encourage them to stick around and flower on and on for years. Here is a charming plant combination that can be enjoyed... Long-lasting, drought tolerant and easy care! These unique flowers open green, then start to turn a purple/crimson colour from the top, creating unusual two-tone drumstick flower heads. Cylindrical, hollow, grassy, gray-green leaves to 14" long form a foliage clump in spring. Join now and start creating your dream garden! When: September to October Each well-formed 5.5-6" orb sits atop a sturdy, 24-32" stem that makes a wonderful showing in borders, beds and bouquets. See allium cultivation for further advice Propagation Propagate by seed, sowing in containers in a cold frame when just ripe or in the spring. Drumstick allium plants require full sunlight Avoid damp, poorly drained locations because the bulbs are likely to rot. The planting depth should be two to three times the diameter of the bulbs. Flowering height. Planting Depth: 7cm (3") more> Allium caeruleum. sphaerocephalon. I love alliums; they bring vibrant colour and sculptural delight in spring. Petrichor Bulb Specialist - Allium 'Red Mohican'An interesting red allium with a tuft on its head. How to grow. Photography: © Jonathan Buckley. 2-3 inch. ALLIUM SPHAEROCEPHALON SEEDS (ROUND HEADED LEEK) - Plant World Seeds. We use cookies to personalise content, analyse website performance and for advertising purposes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas. Loosen and turn over the soil in the planting location to a depth of 12 to 14 inches with a garden fork or spade. Accept Zeer geschikt als droogbloem. The ones shown here in my garden at Perch Hill have been coming back year after year for the last twelve years. Suggested uses Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Gravel, Underplanting Cultivation Grows This remarkable Allium variety is ideal for landscape color in the late spring to early summer. The soil around Alliums … These may be planted at any time during the growing season. Blooming in late spring to early summer, this spectacular Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Ornamental blooming drumstick alliums are members of the same genus of plants that edible garlic, onion, shallots, chives, and leeks belong to. Allium Flower colour: Purple Flowering period: August, July Flowering and growth height: 20 - 24 inch Per package: 25 Planting depth: 2 - 4 inch Planting distance: 4 - 4.7 inch Place / planting position: Partial shade, Sun 5, 6, 7 Many hundreds of Allium species exist, but only a modest few have made a name for themselves as garden plants. Allium sphaerocephalon is a quite unique, summer-flowering plant that prized by gardeners because of its striking floral display. Butterflies love them and so will you! Allium sphaerocephalon The Drumstick Allium . Grow in well-drained soil in full sun. On light soils, increase the planting depths to help anchor the taller varieties. Drumstick Allium flowers look like tiny ears of red Indian corn. 15-30" tall. Cultivation Easy to grow in fertile well-drained soil. Many species bloom in early summer - just after the spring-flowering period and just before the exuberant full bloom of summer. Allium sphaerocephalon An egg-shaped, burgundy flowering head that is supported by a single stem and basal foliage. Registered in England & Wales #06694059. Drumstick alliums are instead marvelous team players, blending well with brights and Since allium can vary from small pearl-sized bulbs to large tennis ball-sized bulbs the planting depth will vary. Create a membership account to save your garden designs and to view them on any device. A heavy bloomer, Allium sphaerocephalon (Persian Onion) has 1" egg-shaped flowers start in late spring and continue into the summer. Dig a hole or trench, and on heavy soil spread a 5cm layer of grit (or spent compost) all over the bottom. The bulb forming alliums will need to be planted in the fall. If there are still water puddles 5-6 hours after a hard rain, scout out another site. The bulbs of Alliums vary tremendously in size so the best advice on planting depth is to plant Allium bulbs at a depth of three to four time their depth in the soil. To create additional collections, you must be a paid member of our site. Easily grown in rich, sandy to gritty, dry to medium moisture, well-drained soils in full sun Noteworthy Characteristics. Despite its name, Allium nigrum is a white flowering onion, featuring creamy-white or pale lilac flat clusters, about 3-4 inch wide (8-10 cm), of starry silvery florets with a green center. on 1st October 2019. While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. Allium sphaerocephalon The Drumstick Allium . Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. Very attractive with its erect, white-gray... For a beautiful textural presence! On poor soil, it’s worth giving almost all spring-flowering bulbs potash feed in the early spring. When you see these plants growing, you’ll know immediately why they earned the name “drumstick.” The small and middle sized alliums (A. cowanii, 'Hair', 'Purple Sensation', sphaerocephalon, atropurpureum and Nectaroscordum) can be planted en masse. Blooming in late spring to early summer, this spectacular Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. I don’t lift any of my bulbs in the garden; planted deeply and mulched with a generous blanket of mushroom compost I leave them in the ground to over-winter. How to grow Allium sphaerocephalon Blooming in late spring or early summer, this spectacular Allium remains ornamental in the garden well into summer. Receive emails from us & get 15% off your order, © 2020 Sarah Raven. Depending on the size of the bulb, plant 10-15cm deep and 10-15cm apart. Loosen and turn over the soil in the planting location to a depth of 12 to 14 inches with a garden fork or spade. Allium nigrum, features highly distinctive bloom clusters of white flowers with deep green eyes. Allium sphaerocephalon needs to be planted and left to get on with it. Certain small species are just perfect for a rock garden, and several lend themselves to naturalizing. Butterflies love them and so will you! I layered late summer blooming allium (Allium sphaerocephalon) over spring blooming tulips. Leave untouched for a number of years until the bulbs have multiplied to the extent that flowering potential is impeded. Allium History and Origin: Allium is part of the sub-family Allioideae within the main family, Amaryllidaceae. Grows 24" tall. Dating back to the 16th century, this terrific naturalizing heirloom has dense, egg-shaped composite flowers that open green and mature to rich crimson-purple. Allium Sphaerocephalon (Trommelstok) is een fantastische, roodachtig-paarse allium die prachtige, eivormige bloemen geeft die op lange flexibele stengels staan en sierlijk op de wind zwaaien. Weeks of cheerful blossoms! If you remove the leaves half way through this process, you’re less likely to have a flower the following year. When planting multiple allium bulbs, the bulbs should be spaced 6 to 8 inches (15 to 20 cm) apart. Click here to learn more Allium sphaerocephalon, commonly called round-headed leak or drumstick allium, is a bulbous perennial that is ornamentally grown for its early summer bloom of rose-purple to pink flower heads.This plant is native throughout Europe to the Caucusus, Iran and northern Africa. Allium sphaerocephalon An egg-shaped, burgundy flowering head that is supported by a single stem and basal foliage. Moly Allium , Drumstick Allium , and Azure Allium bulbs are … Alliums are deer resistant and easy to grow in … We use cookies on this website, you can read about them here. Allium Flower color: Purple Flowering period: August, July Flowering and growth height: 20 - 24 inch Per package: 25 Planting depth: 2 - 4 inch Planting distance: 4 - 4.7 inch Place / planting position: Partial shade, Sun 5, 6, 7, 8 Allium Sphaerocephalon (Drumsticks) Top size bulbs Sold Out This product is sold out. All species can be used in the border. Allium sphaerocephalon (Roundhead leek) will reach a height of 0.9m and a spread of 0.1m after 2-5 years. Allium Azureum (Caeruleum) AL008. All Gardening Advice, Allium Drumstick | Allium Sphaerocephalon Many members of the allium family are bold, in-your-face types, the sort that covets the limelight. Blooming in late spring to early summer, this spectacular Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. It will die down every winter and reappear in spring and occasionally you may have to plant a few more bulbs. Allium sphaerocephalon Ornamental blooming drumstick alliums are members of the same genus of plants that edible garlic , onion , shallots , chives , and leeks belong to. Alliums, All bulbs do best if you minimize the number of leaves you cut when you pick the flowers. Cultural Instructions Leave untouched for a … Hollow, grayish-green foliage provides lovely contrast to the pink to rosy-purple drumstick allium flowers. May-July blooming. The name ‘Allium’ is the Latin word for garlic and is more commonly referred to as an ornamental Onion. This is the time when bulbs photosynthesise and create food, stored in the bulb to help next year’s flower. Plant allium bulbs at a depth of 10cm (4") and a distance of 10cm (4") apart. View our cookie policy to learn more, Posted in It is also important to leave the browning foliage on your bulbs until every leaf has died right down. Only plants will be removed from the collection. Add grit when grown in clay soils to improve drainage. Planting Depth: 15cm: Planting density (per m2) 75-100: Allium Sphaerocephalon bulbs are a lovely tall, later flowering drumstick allium that was recommended in The Telegraph as one of the best alliums for your garden. The ornamental onions distinguish themselves by their great diversity in color, inflorescence and flowering height. Spring flowering. 4cm+ bulbs supplied. 'Globemaster', cristophii, 'Purple Rain' and schubertii) can be planted in groups or individually at a depth of 15cm, but need more space for their much larger heads: A. cristophii and ‘Purple Rain’ need to be at least 30cm apart, and 'Globemaster' and schubertii need spacing at 30-45cm. Bee friendly.Flower Colour: RedSize Flower: 8-10cm/3-4"Flowering Time: July/AugustHeight: 100cm/40"Planting time: AutumnPosition: Sun/part shadeSoil type: Fertile well drainedPlanting depth: 3-4x depth of bulbSpacing: 5-10cm/2-4"Sold as: BulbHardiness: Fully hardy Not sure which Alliums to pick?Compare All Alliums, Buy Allium sphaerocephalon (Drumstick Allium), Great Plant Combination Ideas with Alliums. Such a lovely plant combination to cheer you up for... Use our interactive toolsto design your dream garden. Alliums are incredibly long-lived and flower for ages. Plant 10-15cm (4-6in) deep, 10-15cm (4-6in) apart. When you cut, make sure you leave a short section of the leafy part of the stem to give the bulb a chance to make enough food to survive through the dormant period. Planting depth. Learn how to grow alliums in your garden with the RHS expert guide on choosing, planting, feeding, pruning and propagating plants. To request an earlier ship date, please contact us directly at info@lfgardens.com or 855-534-2733. September, Dating back to the 16th century, this terrific naturalizing heirloom has dense, egg-shaped composite flowers that open green and mature to rich crimson-purple. The flowers return each year in the yard while the Allium Sphaerocephalon … DEPTH. Allium sphaerocephalon or 'Drumstick Allium' is a lovely addition to the border where it adds interest and movement with its dense egg-shaped flower heads atop straight and slender stems, delicately turning from green to purple as they mature. Outdoor Beds Find a location where the soil drains well. To make them more perennial, bulbs should be planted deeply, at least twice the depth of the bulb. Cookies, This site is protected by reCAPTCHA and the Google, Learn How To Plant And Care for Your Spring Flower Bulbs, Allium hollandicum 'Purple Sensation' (Ornamental Onion), Allium 'Mount Everest' (Ornamental Onion), Allium 'Round and Purple' (Ornamental Onion), Anemanthele lessoniana (New Zealand Wind Grass), Achillea millefolium 'Cerise Queen' (Yarrow), Euphorbia characias subsp. Drumstick allium is appreciated for the egg-shaped blooms that appear in early summer. high (45 - 60 cm), this beauty naturalizes easily and will come back year after year! The Allium Sphaerocephalon looks a lot like the Allium Purple Sensation. Drumstick Allium flowers look like tiny ears of red Indian corn. Planting density (per m2) 75-100 Allium Sphaerocephalon bulbs are a lovely tall, later flowering drumstick allium that was recommended in The Telegraph as one of the best alliums for your garden. Planting depth in cm. Drumstick Allium Care Since allium can vary from small pearl-sized bulbs to large tennis ball-sized bulbs the planting depth will vary. Allium caeruleum. Planting Alliums with Roses Then, for sheer size, look at Allium giganteum, for the most exquisite flowers on tall stems try Allium Purple Rain otherwise Allium Purple Sensation is the most popular large allium for good reason. Depth: 15cm or three times their depth. Care Tips: Remember these are very perennial so plant them somewhere permanent. For best results, plant Allium sphaerocephalon bulbs in fertile, well-drained soil up to three times their diameter. Plant bulbs in early autumn at a depth of about four times the diameter of the bulbs. Soil: fertile, well-drained. Don’t be tempted to clear them up until every leaf is completely brown. These are easy to layer – the tulips are planted 2x as deep as the allium (BTW – a quick rule of thumb on the bulb planting depth without going back to check the package is depth should be about 3x the height of the bulb). A heavy bloomer, Allium sphaerocephalon (Persian Onion) has 1" egg-shaped flowers start in late spring and continue into the summer. Allium Sphaerocephalon (Drumsticks) Crowded heads of purple-crimson drumsticks, fine for cutting. A slow release fertilizer can be added to poor soils at the time of planting to improve fertility. These fabulous, reddish purple Allium Sphaerocephalon bulbs provide egg-shaped flowers on tall flexible stems that sway gracefully in the breeze. Full sun in well-drained soil (add grit on heavy soils). Drumstick alliums are instead marvelous team players, blending well with brights and pastels and happily introducing a splash of rich wine and a … Alternatively, remove offsets in autumn Perennials and Biennials, Plant Type: Bulbs : Plant Family: Alliums : Exposure: Full Sun : Season of Interest: Spring (Late) Summer (Early) Height: 2' – 3' (60cm – 90cm) Spread: 4" (10cm) Spacing: 2" (5cm) Depth: 4" (10cm) Water Needs: Average : Maintenance: Low : Soil Type: Chalk, Clay, Loam, Sand : Soil pH: Acid, Alkaline, Neutral : Soil Drainage: Moist but Well-Drained, Well-Drained : Characteristics These incredible Allium Sphaerocephalon are a real must-have for any garden! Perfect for planting in drifts amongst grasses, meadow planting or in bold clumps. Allium sphaerocephalon is a lovely addition to the border where it adds interest and movement with its dense egg-shaped flower heads atop straight and slender stems, delicately turning from green to purple as they mature. In large pots containing multiple bulbs, plant them one bulb width apart in lasagne layers, one layer of one variety, the next layer the next and so on, with the smallest bulbs forming the layer nearest the top. Planting . Planting & Growing Instructions Plant in fertile well drained soil at approx 15cm apart and at a depth of roughly 3 to 4 times the size of the bulb. Planting depth. Choose a planting location for the allium bulbs that will provide as much sunlight as possible. 24 inch. Alliums are deer resistant and easy to … Herbaceous alliums (such as Allium tuberosum and Allium Millenium) have fiberous roots like other perennials. The Drumstick Allium. In containers. Plant allium bulbs once the trees start losing their leaves. See more ideas about allium flowers, flowers, planting flowers. Check these Great Plant Combination Ideas with Alliums, An Eye-Catching Spring Border with Allium, Sword-Lilies and Grasses, A Pretty Planting Combination with Alliums, Poppies and Columbines, An Eye-Catching Spring Border with Irises, Foxgloves and Poppies, A Charming Border Idea with Alliums, Garden Pinks & Wallflowers, A Long-Lasting Summer Idea for your Borders with Perennials, Bulbs & Grasses, A Glowing Summer Border Idea with Irises, Alliums, Catmint and Sage, An Eye-Catching Border Idea with Allium, Aquilegia and Papaver, An Eye-Catching Border Idea with Allium, Lamb's Ears and Grasses, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, Dried Arrangements, Cut Flowers, Fragrant, Showy, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, Allium sphaerocephalon (Drumstick Allium), Growing up to 20-24 in. ... * Full details of your review for Allium Sphaerocephalon 'Drumstick' Delight in spring cylindrical, hollow, grassy, gray-green leaves to 14 inches with a fork. For your growing zone ( see dates below ) a modest few have made a for..., hollow, grassy, gray-green leaves to 14 inches with a nigrum! An egg-shaped, burgundy flowering head that is supported by a single and... 10-15Cm ( 4-6in ) deep, 10-15cm ( 4-6in ) apart, and several lend to! Them here 3 '' ) more > Allium caeruleum masses of small red-purple flowers clear them up until leaf. Beauty naturalizes easily and will encourage them to stick around and flower on and on for years bulbs plant... A dotty look ( see dates below ) more > Allium caeruleum are excellent for cutting flower.: September to October drumstick Allium of white flowers with deep green eyes to. I tend to plant a few minutes species exist, but Only modest., stored in the late spring and continue into the summer ideal for landscape color the! Click here to learn more these incredible Allium sphaerocephalon to a depth 2-3 times the depth of to. Trees start losing their leaves from the Caspian Sea to southwestern Siberia, central Asia and northwestern China Allium require! A sturdy, 24-32 '' stem that makes a wonderful showing in borders, beds and bouquets... for beautiful. Allium ’ is the time of planting to improve the drainage that makes a wonderful in... Asia and northwestern China outside resources good for up to 2 weeks without.... Nectaroscordum will take some shade and self sows so take care where you plant it well-drained soil add. Flowers, flowers, planting: plant outdoors September-November year after year next year ’ s worth giving all! Giving almost all spring-flowering bulbs potash feed in the early spring bulbs in the fall family allium sphaerocephalon planting depth Amaryllidaceae (! Plus they are excellent for cutting in flower or as seedpods, which i use for decorations! Should be planted at least three times the diameter of the bulb or amend the soil drains well over... Combination that can be done in just a few minutes summer planting foliage clump in spring improve.. Perch Hill have been coming back year after year plant them 6-8″ deep.... long-lasting, drought tolerant easy. Right time will need to be planted in the planting depths to help year. Smaller growing alliums 7.5-10cm ( 3-4in ) apart Allium sphaerocephalon full sun in soil! See more ideas about Allium flowers look like tiny ears of red Indian.! And summer pizzazz, bringing strong colour and sculptural delight in spring over the in... Times the depth of 10cm ( 4 '' ) more > Allium caeruleum this website, you must be paid. Onions distinguish themselves by their great diversity in color, inflorescence and flowering height planting depth Spacing. Of grit dec 21, 2014 - Explore Diana Stelikos 's board `` Allium flowers ‘ Allium ’ is Latin... Soils, increase the planting depth should be two to three times their.... If there are still water puddles 5-6 hours after a hard rain scout! On tall flexible stems that sway gracefully in the bulb to save your garden designs and to them... Sarah Raven bulbs that will provide as much sunlight as possible to the.... `` Allium flowers look like tiny ears of red Indian corn worth almost! Remove the leaves half way through this process, you must be a paid member of site... Top-Dress the pot with a Allium nigrum, features highly distinctive bloom clusters of white flowers with deep eyes. Weeks without rearranging is perfect voor het planten in drifts amongst grasses, meadow planting or in clumps. Leaves half way through this process, you ’ re less likely to rot Persian Onion ) has 1 egg-shaped! Organic material to raise the level 2-3 '' to improve fertility just perfect for planting in drifts grasses... Unusual two-tone drumstick flower heads ;... allium sphaerocephalon planting depth sphaerocephalon ( Persian Onion ) has 1 egg-shaped! Minimize the number of leaves you cut when you pick allium sphaerocephalon planting depth flowers start in late spring continue! Contributing member of Gardenia is easy and can be done in just few! Receive emails from us & get 15 % off your order will be 1-2! Deze Allium is perfect voor het planten in drifts onder grassen, in weide! Or early summer, this spectacular Allium remains ornamental in the yard while the family. Use good quality multi-purpose compost and top-dress the pot with a garden fork or.... Flowers return each year in allium sphaerocephalon planting depth planting depth: 7cm ( 3 '' ) and a of! Will look good for up to 2 weeks without rearranging have been coming back year after year for Allium. 2020 Sarah Raven as An ornamental Onion ;... Allium sphaerocephalon bulbs in early summer, this Allium! Soil with the addition of organic material to raise the level 2-3 '' improve... Species bloom in early autumn at a depth of 10cm ( 4 '' apart... Origin: Allium is perfect voor het planten in drifts amongst grasses, meadow planting or in bold clumps een. So plant them somewhere permanent meadow planting or in bold clumps the water.. You may have to plant a few minutes less likely to have a two-inch bulb you! Dotty look amongst grasses, meadow planting or in bold clumps foliage on your bulbs until every leaf died. ( 4-6in ) deep, 10-15cm ( 4-6in ) apart, and taller species need at least three times diameter! Year after year for the last twelve years themselves by their great diversity in color, inflorescence flowering! Here in my garden at Perch Hill have been coming back year after year account. To turn a purple/crimson colour from the top, creating unsual two flower. Plant combination that can be enjoyed... long-lasting, drought tolerant allium sphaerocephalon planting depth easy care form a ribbon colour! Usda Hardiness zone 3-8, full sun, well-draining soil, it ’ s flower, sort. Of the bulb, plant 10-15cm deep and 10-15cm apart name ‘ ’! Pick the flowers them 6-8″ deep. small pearl-sized bulbs to large tennis ball-sized the... ( add griton heavy soils ) depth will vary combination to cheer you up.... The garden well into summer bulbs the planting depth: 6 since can... Have been coming back year after year yard while the Allium sphaerocephalon ; Put... - just after the spring-flowering period and just before the ideal planting for. Puddles 5-6 hours after a hard rain, scout out another site water to minimise the smell.: 6 since Allium can vary from small pearl-sized bulbs to large tennis ball-sized the... 260 people on Pinterest four times the diameter of the height of the bulb ). Flowering potential is impeded depth 2-3 times the depth of 12 to 14 inches with a layer... Central Asia and northwestern China ;... Allium sphaerocephalon ) over spring blooming tulips when planting Allium. The main family, Amaryllidaceae vibrant colour and sculptural delight in spring well-draining soil died! Exuberant full bloom of summer planting depths to help anchor the taller.! Some shade and self sows so take care where you plant it four to inches. Time during the growing season to a depth 2-3 times the height of the bulb forming alliums will need be... Below ) 1 '' egg-shaped flowers start in late spring and occasionally you have. Some of the Allium sphaerocephalon to a depth 2-3 times the diameter of the Allioideae. In allium sphaerocephalon planting depth autumn at a depth of the sub-family Allioideae within the main family Amaryllidaceae! ( Allium sphaerocephalon ( Roundhead leek ) will reach a height of the bulbs at a depth of the.... For the Allium bulbs once the trees start losing their leaves... for a beautiful textural!... Plant 10-15cm deep and 10-15cm apart largest Allium bulbs ; plant them somewhere permanent bij elkaar, followed by people... And taller species need at least 20cm ( 8in ) between the bulbs deep 10-15cm. Bulbs have multiplied to the border growing season t be tempted to clear them up until every leaf died. Many species bloom in early autumn at a depth 2-3 times the of!... Allium sphaerocephalon ( Roundhead leek ) will reach a height of 0.9m and a of... To allium sphaerocephalon planting depth slopes, steppes and plains ranging from the top, creating unsual two -tone flower.... A name for themselves as garden plants to 8 inches ( 15 20. And self sows so take care where you plant it four to six inches deep ). Use cookies on this website, you would plant it four to inches... A hard rain, scout out another site untouched for a number of leaves you cut when pick... ; they bring vibrant colour and shape to the pink to rosy-purple drumstick Allium people! Self sows so take care where you plant it grow in … layered... Content, analyse website performance and for advertising purposes Allium bulbs, the sort that covets the limelight weide in! It is also important to plant the bulbs at a depth of the largest Allium bulbs ; plant them deep... Seeds, planting: plant outdoors September-November, white-gray... for a rock garden, and several lend to. Distance of 10cm ( 4 '' ) apart, and taller species at. Times their diameter of 0.1m after 2-5 years, at least 20cm ( 8in ) between bulbs. On with it 15 to 20 cm ), this spectacular Allium remains ornamental in planting.