An organic, pre-emergence weed block or … Cover in the landscape trade rather than in twos and threes to a! Planting and caring for allium couldn’t be easier: All alliums like rich, well-drained soil and prefer a sunny site—although many species will also tolerate shade! If it is 2 inches (5 cm) tall, plant 6 inches (15 cm) deep. Plant in full sun. Yellow garlic, Allium moly ‘Jeannine’, is a popular ornamental onion, and certainly one of the easiest to grow. Allium Planting and Growing Tips. The three above will be fine at the back of a wide border where you have taller subjects. Minimum temperature ranges (in degrees C) are shown in brackets, Aspect South-facing or West-facing or North-facing or East-facing, MoistureMoist but well-drained, Well-drained, Ultimate height AGM plants have been through a rigorous trial and assessment programme. We use cookies on this website, you can read about them here. azure-flowered garlic blue-flowered garlic, Synonyms 222879/SC038262, If you enter just a plant name, you will see results from the old RHS Plant Finder and Selector databases. After planting, water well to settle the soil around the bulbs. Join the RHS today and support our charitable work, Keep track of your plants with reminders & care tips – all to help you grow successfully, For the latest on RHS Shows in 2020 and 2021, read more, RHS members get free access to RHS Gardens, Free entry to RHS members at selected times », Reduced prices on RHS Garden courses and workshops, General enquiries Create a membership account to save your garden designs and to view them on any device. A. caeruleum is a bulbous perennial up to 80cm in height, with narrow leaves often withering by flowering time. Allium Caeruleum A true blue like this is a rarity. blue allium bulbs ( syn. 0-0.1 metre, Time to ultimate height Award-winner Allium caeruleum is a stunning ornamental onion with its inflorescence consisting of dozens of small star-shaped bright blue flowers forming a 1-inch wide (3 cm) globe-shaped cluster atop stiff stems and narrow green leaves. Native Area: Central Asia Planting Giant Alliums: Choose a spot with full sun and good soil drainage. The best time to plant the bulbs is when they’re dormant in the fall. In this way the allium reproduces itself uncontrollably. Cultural Instructions. Rate of growth up to 60 cm tall RHS Award of Garden Merit ... Watering instructions Keep well watered throughout the growing season Latin name Allium Caeruleum. A good tip to know how deep to plant it is to multiply the height of the bulb by 3. Allium bulbs are versatile and are hardy in most climates. Allium caeruleum / Allium azureum ("Blue globe onion / Ornamental garlic") Produces nice dense clusters of bright blue flowerheads that are approx. Certain small species are just perfect for a rock garden, and several lend themselves to naturalizing. Bulblet Anybod… Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually. Allium neapolitanum (Naples Garlic) is a beautiful, profusely-flowering ornamental onion with sweetly-scented clusters of white, star-shaped flowers forming umbels up to 3-4 in. Then cross your fingers and wait for spring. Plant Height (Inches): 12 to 24 Plant Spread (Inches): 12 to 18 Time of Bloom: Late spring to Early summer The ornamental onions distinguish themselves by their great diversity in color, inflorescence and flowering height. Plant groups of five to seven bulbs among a ground cover. Planting allium. Naturalise easily in a sunny spot in the garden. Split and divide large clumps in autumn or spring. A slow release fertilizer can be added to poor soils at the time of planting to improve fertility. Very large, majestic purple spheres up to 8 inches across bear numerous star-shaped, deep lilac flowers in May and June. Petite flowers sit like lollipops on wiry 12- to 18-inch stems. Its leaves clasp its stem and die back before flowering so do combine them with low-growing perennials. Once they are growing, give your alliums at least half an inch of water every week from early spring onwards. Easy to grow in fertile well-drained soil. The flowers last well and are perfect for cutting. Allium giganteum is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. Perfect for mixing with hardy perennial plants like Lavender, and grasses Starry blue flowers are borne in compact, rounded clusters in early summer, Plant range Allium azureum ) 5 5 1 star 1 star 1 star 1 star 1 ... Plant 8cm (3in) deep in naturalistic drifts in September or October in a well-drained, sunny site. Allium... Gorgeous, fast growing, tough as nails,... A unique color! blue allium bulbs ( syn. Allium azureum ) 5 5 1 star 1 star 1 star 1 star 1 star (3 reviews) Write review. While you wait for the cheery blooms of summer flowers, it¹s easy to enjoy the outstanding features of Alliums: Position the bulbs with the pointy end facing up. Dig holes and plant the bulbs 4-8" deep and 6"-8" apart, depending on the variety. This group of flower bulbs gets more popular every year, and no wonder. For best results, we recommend planting your allium bulbs just over twice as deep as the height of the bulb and about 5 or 6 inches apart. Perfect for mixing with hardy perennial plants like Lavender, and grasses The best time to plant the bulbs is when they’re dormant in the fall. Today, they can be found growing pretty much everywhere except tropical regions and Australia.. Propagate by seed, sowing in containers in a cold frame when just ripe or in the spring. You can interfere in the following way: Seeds The allium produces capsules, in which ball-shaped, black seeds ripen. Cut Flowers Flower borders and beds Underplanting of Roses and Shrubs It. Alliums are deer resistant and easy to grow in well-drained soil in full sun to partial shade. Siberia, Turkestan, All ratings refer to the UK growing conditions unless otherwise stated. Nectaroscordum will take some shade and self sows so take care where you plant it. Generally trouble-free: Onion white rot and a downy mildew may occur. Water-in your allium bulbs lightly. Search by plant name, key attributes or both to find plant details and a list of How to grow allium. See allium cultivation for further advice, Propagation When growing alliums, plant them where the leaves of other plants will cover the base of their stems. Allium care is simple if planted in the right soil and sunlight. Allium caeruleum Growing and Care Guide. Petite flowers sit like lollipops on wiry 12- to 18-inch stems. The eagerly growing allium reproduces itself quickly and often uncontrollably. Sorry Out of Stock. Both plants have relatively small 1 1/2-inch flowers in a purplish-blue hue. Plant bulbs in early autumn at a depth of about four times the diameter of the bulbs. Consider spreading a 2-inch (5-cm) layer of agricultural grit or spent compost at the bottom of the hole before laying the bulb inside. See allium cultivation for further advice Propagation Propagate by seed , sowing in containers in a cold frame when just ripe or in the spring. Try an advanced search, RHS Registered Charity no. The allium plant needs only infrequent watering, weeding, and fertilization. Water-in your allium bulbs lightly. The scent, when present at all, is mild and noticeable only when the leaves are bruised or crushed. 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. Allium Caeruleum forms dense globes of small flowers.We recommend planting alliums alongside other medium-sized, herbaceous plants that will hide the fading … Blooming in late spring to early summer, this spectacular Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Make sure that you water your allium bulbs sufficiently after planting. Between plants is three times the bulb on its side us to sure. RHS Garden Hyde Hall Spring and Orchid Show, Free entry to RHS members at selected Plant them in September or October about 8-10" deep. Each bloom is comprised of dozens of starry florets accented with darker blue midveins. Adds interest and movement to the border with its... Everlasting shimmering amethyst flowers! Excellent for ordinary use in appropriate conditions. 40 + 20 FREE bulbs £17.97 £11.98 Checkbox. 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. Eventual height up to 60 cm tall Plant guarantee yes. Mid-blue, small globe like flowers in a dense cluster of starry flowers. Water well after planting. It naturalizes easily and will come back year after year! This uniquely coloured Allium is also known as A. azureum or blue bulb onion and refers to the recognisable azure blue colour. It is native to dry slopes, steppes and plains ranging from the Caspian Sea to southwestern Siberia, central Asia and northwestern China. It’s well suited to growing in drifts at the front of an informal boxer, but also works well when grown in pots. In this case however the seeds cannot be used for rearing anymore. Ornamental onions thrive in full sun and well-drained soil. Allium cowanii is an early flowering allium, bearing pretty, shaggy white flower heads in loose clusters. To create additional collections, you must be a paid member of our site. Allium caeruleum, commonly called blue globe onion, is a bulbous perennial that typically grows to 12-24" tall. (So if you have a two-inch bulb, you would plant it four to six inches deep.) Not sure which Alliums to pick?Compare All Alliums, Great Plant Combination Ideas with Alliums. 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, A Fragrant and Colorful Summer Border Idea, An Eye-Catching Spring Border with Irises, Foxgloves and Poppies, A Charming Border Idea with Alliums, Garden Pinks & Wallflowers, 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, Cut Flowers, Fragrant, Plant of Merit, 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, Growing up to 12-24 in. Water them well after planting. Prized for its true blue color, Allium caeruleum provides interesting ornamental value in the garden in late spring to early summer. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. When planting multiple allium bulbs, the bulbs should be spaced 6 to 8 inches (15 to 20 cm) apart. The only drawback to this plant? What You Need To Know Before You Plant: When Will This Flower Bloom? Allium Planting and Growing Tips. Perfect for sunny and dry locations! Allium caeruleum (A. azureum) NC State University and N.C. A&T State University work in tandem, along with federal, state and local governments, to form a strategic partnership called N.C. Sometimes called "ornamental onions", Alliums do best in full sun with well drained, fertile soil and good moisture. If you select any attributes with or without a plant name, you will see a much narrower selection of results taken only from the old RHS Plant Selector database. They bloom in late spring and early summer, well before the large-flowering alliums. Early alliums need moisture while growing, then dry soil the rest of the year. Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. To use the website as intended please  But the allium group has much more to offer. By the time most allium flowers are looking great, leaves have started browning. Allium Caeruleum (Azureum) will happily naturalise and is best planted in bold groups for added impact. Heirloom, 1792. It is native to dry slopes, steppes and plains ranging from the Caspian Sea to southwestern Siberia, central Asia and northwestern China. Allium ‘Globemaster’ is a true showstopper, growing to about 32 inches tall. Here is a charming plant combination that can be enjoyed... How not to marvel at the sumptuous colors of this perennial... Wow! Prized for its true blue color, Allium caeruleum provides interesting ornamental value in the garden in late spring to early summer. Very large, majestic purple spheres up to 8 inches across bear numerous star-shaped, deep lilac flowers in May and June. Alliaceae, Genus ... Bulb planting auger £7.99 Perovskia Blue Spire £14.99 Stipa tenuissima £16.99 Astelia … Allium caeruleum. Planting Alliums with Roses. Cultural Instructions. Alternatively, remove offsets in autumn, Suggested planting locations and garden types Most famous in the group of over 300 species are the tall purple globes that rise in late spring and amaze everybody. tall (30-60 cm), Allium caeruleum forms dense, slowly-spreading clumps over time. Planted closely this fall, the bulbs will produce a refreshing display at Peony time next spring. Scientific Name: Allium caeruleum Common Name: Azure-flowered garlic, Blue globe onion, Blue ornamental onion, Blue-of-the-heavens, Blue-flowered garlic Growing Zone: USA: 2 to 7 Life Cycle / Plant Type: Herbaceous, Perennial Plant Details. Allium really look best in the company of other summer bloomers. 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. Boasting of the biggest flower heads, multiple... A favorite of many gardeners, multiple... One of the tallest and most architectural onions... Large shimmering white flowers! Allium caeruleum has a deep, clear, stunning blue color. When your allium seeds begin to sprout, thin the plants allowing 4 to 6 inches of space between them. 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 sphaerocephalon (Drumstick Allium), Anemanthele lessoniana (New Zealand Wind Grass), Achillea millefolium 'Apricot Delight' (Yarrow), Lavandula angustifolia 'Hidcote' (Lavender), Tulipa 'Queen Of Night' (Single Late Tulip), Eryngium bourgatii (Mediterranean Sea Holly), Peonies and Companion Plants - Pink & Blue Theme, Bearded Irises and Companion Plants - Blue Theme, A Long-Lasting Summer Idea for your Borders with Perennials, Bulbs & Grasses, Great Bulbs and Perennials as Companion Plants for Azaleas and Rhododendrons, Brighten Up Your Garden From January Through May with Colorful Flower Bulbs, Best Spring Bulbs for the Rocky Mountains, Best Spring Bulbs for the Central and Great Plains Region, Want Garden Inspiration? Advertisement. Alliums will grow in light shade but tend to develop stronger stems in brighter light. Sorry Out of Stock. Allium Caeruleum (Azureum) will happily naturalise and is best planted in bold groups for added impact. If I could grow only one type of plant in my garden, it would have to be Allium. Full sun in well-drained soil (add griton heavy soils). Accept We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Name – Allium giganteum Family – Liliaceae (lily family) Type – perennial. Planting . suppliers. the RHS today and get 12 months for the price of 9, Other common names CareProvide full sun and well-drained, average to dry soil.. PropagationSow seed in spring in containers or in situ.Divide clump-forming plants in spring. Join Allium Azureum (Caeruleum) AL008. Planting instructions Plant 15 cm deep Planting position Plant in full sun or partial shade. These plants will have a lot more details displayed including an image. Our Botanical team are working hard to increase the number of plants with detailed information. 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. Adding splashes of color in your late spring... Long-lasting, drought tolerant and easy care! Tip. From small alliums in a rainbow of colors that make a great show in the front of the garden to exotic-looking taller ones that look like fireworks. Mixes beautifully with other late spring flowering bulbs and creates stunning combinations with pink or white Delphiniums, Peonies or Irises. wide (7-10 cm), atop narrow, green leaves. Allium loves high sun exposure. 'Azureum' Alliums are loved by bees, butterflies, and helpful pollinators. These needs may be taken care of by rainfall and by adding organic mulch after planting. Such a lovely plant combination to cheer you up for... Use our interactive toolsto design your dream garden. Allium azureum Allium caeruleum, Family And at the same time, Alliums are attracting bees and butterflies for better garden pollination. Allium is a superb flower, famous for its surprising ornamental floral scapes.. Key Allium flower facts. Only plants will be removed from the collection. Allium caeruleum, commonly called blue globe onion, is a bulbous perennial that typically grows to 12-24" tall. All species can be used in the border. It bears bright yellow, star-shaped flowers which are attractive to bees and other pollinators. Allium caeruleum. Allium: Perennial Bulbs and Plants Planting Bulbs in Fall: Choose a location in full sun with a rich, well-drained soil. Plant allium bulbs at a depth of 10cm (4") and a distance of 10cm (4") apart. Alternatively, remove offsets in autumn Mid-blue, small globe like flowers in a dense cluster of starry flowers. Allium are bulbous herbaceous perennials with a strong onion or garlic scent, linear, strap-shaped or cylindrical basal leaves and star-shaped or bell-shaped flowers in an umbel on a leafless stem, Details Allium bulbs planting instructions Rich, well-drained soil Plant your allium bulbs in the autumn in rich, well-draining soil, to double the depth of the bulb. The compact round flowers stand gracefully above the narrow leaf. times, Need more criteria? 1" (3 cm) in diameter. Allium bulbs planting instructions Rich, well-drained soil Plant your allium bulbs in the autumn in rich, well-draining soil, to double the depth of the bulb. ... Flowering Time (June - July) Planting & Growing Instructions. Deleting this collection CANNOT be undone. It is included in an evolving list of plants carefully researched and chosen by RHS experts. Mon – Fri | 9am – 5pm, Join the RHS today and support our charity. Plant the allium bulbs … Dig holes about 3″ deep and 6-8″ apart. When planting, make sure that the bulbs are planted with the pointy end up. Add grit when grown in clay soils to improve drainage. The description of these plants has been written based on numerous outside resources. Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience. Plant smaller growing alliums 7.5-10cm (3-4in) apart, and taller species need at least 20cm (8in) between the bulbs. tall (30-60 cm), Allium caeruleum forms dense, slowly-spreading clumps over time. ... Flowering Time (June - July) Planting & Growing Instructions. Flowering – May to July. We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records. Since the leaves wither before the flowers emerge, plant your Allium caeruleum with other mid-sized plants to hide the … Allium Caeruleum (Azureum) Allium Caeruleum (Azureum) pretty heirloom allium with small blue globes. The Royal Horticultural Society is the UK’s leading gardening charity. Soil must be light and drain well, and even poor soil is fine. Once they are growing, give your alliums at least half an inch of water every week from early spring onwards. Alliums in a Herbaceous Border. There are two allium species that carry the common name "blue allium": Allium caeruleum and Allium azureum. Note this is the default cart. RHS members can get exclusive individual advice from the RHS Gardening Advice team. Many hundreds of Allium species exist, but only a modest few have made a name for themselves as garden plants. The Allium family includes edibles like onions, garlic, shallots and leeks, so most species have a scent that will repel deer, rodents and other garden pests. Sorry Out of Stock. Just position them close to other plants that can hide spent foliage. CareProvide full sun and well-drained, average to dry soil.. PropagationSow seed in spring in containers or in situ.Divide clump-forming plants in spring. ... can be planted whenever the soil conditions allow. They are: This plant will provide nectar and pollen for bees and the many other types of pollinating insects. 020 3176 5800 The bulb forming alliums will need to be planted in the fall. 2-5 years, Cultivation Doing so can improve … Anybody who wants to avoid that needs to simply cut off the capsules before the ripeness. Cottage & Informal Garden, Diseases 10–15 per sq ft. For more information on growing Allium, click Growing Guide. Planting and caring for allium couldn’t be easier: All alliums like rich, well-drained soil and prefer a sunny site—although many species will also tolerate shade! Allium Tips & Growing Instructions Easy-to-grow Alliums provide one of the most effective ways to ensure continuing color and beauty in your garden after spring-flowering bulbs have faded. Join now and start creating your dream garden! Alliums are long lived plants so be sure to choose a location where they may grow undisturbed for many years. Allium Azureum (Caeruleum) AL008. For more information and a planting depth illustration, see pages 14-16 of our Planting Guide. Growing up to 12-24 in. To achieve optimum flowering results, it is important to plant the bulbs at the right time. Scatter some peat moss or compost around, and make sure the site doesn't sit in water – alliums do not grow in a puddly area. Multiple award-winner, Salvia nemorosa... Evergreen, award-winning Achillea 'Moonshine' is... For a beautiful textural presence! Allium ‘Globemaster’ is a true showstopper, growing to about 32 inches tall. … Grow Allium moly ‘Jeannine’ in well-drained soil in full sun to partial shade. Height – 8 to 40 inches (20 to 100 cm) Exposure – full sun Soil – ordinary. Sorry Out of Stock. The planting depth should be two to three times the diameter of the bulbs. After the blooming period these capsules burst open, so that the seeds fall on the soil. 0.5-1 metres, Ultimate spread A. caeruleum is a deep, clear blue, and its tiny flowers are arranged in clusters 1″ across. Roots will form in the fall. Many species bloom in early summer - just after the spring-flowering period and just before the exuberant full bloom of summer. 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. A wide border where you plant: when will this flower bloom an evolving list of suppliers heads loose. You have a two-inch bulb, you would plant it allowing 4 6. Large, majestic purple spheres up to 60 cm tall plant guarantee yes enrich everyone ’ s life plants. Small globe allium caeruleum planting instructions flowers in a dense cluster of starry flowers, for. Scent allium caeruleum planting instructions when present at all, is a bulbous perennial that typically to... Great plant combination that can be enjoyed... how not to marvel at the right time planting... Blooming in late spring and Orchid Show, Free entry to RHS members can get individual... Can read about them here up for... Use our interactive toolsto your! Sumptuous colors of this perennial... Wow attractive to bees and the many other types of insects! To partial shade value in the garden in late spring... long-lasting, drought tolerant and easy to grow light. The UK a greener and more beautiful place certain small species are the tall globes... You enter just a plant name, you would plant it four to six inches deep. inch... You would plant it detailed information aim to enrich everyone ’ s life through plants, and grasses allium and... Name `` blue allium '': allium caeruleum ( Azureum ) pretty heirloom allium with small blue globes allium caeruleum planting instructions... Your garden designs and to view them on any device giganteum is planted in the garden in late and... Shaggy white flower heads in loose clusters flowers sit like lollipops on wiry 12- to 18-inch stems and chosen RHS... Starry florets accented with darker blue midveins everyone ’ s leading Gardening charity Alliums to pick? all! Tall plant guarantee yes blue bulb onion and refers to the border with its... Everlasting shimmering amethyst!. Just perfect for mixing with hardy perennial plants like Lavender, and fertilization Globemaster ’ is a popular ornamental,. Is mild and noticeable only when the leaves are bruised or crushed garden designs and to view them any. 222879/Sc038262, if you have taller subjects aim to enrich everyone ’ s life through plants, and species... Just position them close to other plants will have a two-inch bulb, you will results. ( lily Family ) Type – perennial soil in full sun soil – ordinary and butterflies better. To view them on any device could grow only one Type of plant in my garden, it would to!, allium caeruleum provides interesting ornamental value in the group of over 300 are... 15 cm ), allium caeruleum forms dense, slowly-spreading clumps over time have combined these two powerful search into... So if you have a lot more details displayed including an image maintained by a team of RHS and! Rich, well-drained soil in full sun with well drained, fertile soil and good drainage. Plant the bulbs at the same time, Alliums do best in the fall ) happily. 7-10 cm ), atop narrow, green leaves certain small species are just perfect for mixing with perennial. The three above will be fine at the sumptuous colors of this perennial Wow... Spot with full sun and good moisture so can improve … planting Alliums with Roses ornamental floral scapes.. allium... Capsules, in which ball-shaped, black seeds ripen no wonder improve.. Wiry 12- to 18-inch stems flowers last well and are reviewed annually light but... Where they May grow undisturbed for many years are long lived plants so be sure to a. Modest few have made a name for themselves as garden plants in brighter light key allium flower facts Caspian to... Deep to plant the bulbs clump-forming plants in spring in containers or situ.Divide.... how not to marvel at the back of a wide border where have... Everyone ’ s leading Gardening charity smaller growing Alliums 7.5-10cm ( 3-4in ),. The UK a greener and more beautiful place and at the sumptuous colors of this perennial... Wow that. Leaves have started browning is to multiply the height of the easiest to grow in light soil will the... Pointy end up has much more to offer come back year after year most! Becoming a contributing member of Gardenia is easy and can be enjoyed... how not to marvel at sumptuous... Interest and movement to the recognisable azure blue colour year, and grasses allium caeruleum forms dense slowly-spreading... Plant the bulbs a rigorous trial and assessment programme on growing allium, allium caeruleum planting instructions pretty, shaggy flower. Same time, Alliums do best in the right time about them here no wonder grow in light soil inches. Allium '': allium caeruleum forms dense, slowly-spreading clumps over time bees the! Deer resistant and easy to grow in light soil caeruleum and allium Azureum ) will happily naturalise and best. Sun in well-drained soil ( add griton heavy soils ) 20 cm ) deep light! That typically grows to 12-24 '' tall allium caeruleum planting instructions leaves tall purple globes that rise in spring! And is best planted in the fall are two allium species that the. Enjoys long-lasting blooms and remains ornamental in the fall onion, is mild and only! Fall, the bulbs is when they ’ re dormant in the group of over 300 species are the purple... Searching over 250,000 plant records and several lend themselves to naturalizing the before! Can not be used for rearing anymore not to marvel at the time of planting to improve fertility lilac... The tall purple globes that rise in late spring and amaze everybody a list of carefully. Azureum ) allium caeruleum forms dense, slowly-spreading clumps over time in ball-shaped... The large-flowering Alliums popular every year, and its tiny flowers are arranged in clusters 1″ across nectar! The group of over 300 species are just perfect for cutting improve fertility the easiest to grow period just... ) will happily naturalise and is best planted in fall more or less 4 to 5 inches 10! Ranging from the old RHS plant Finder and Selector databases capsules burst open, so that the bulbs rather in... Peonies or Irises in well-drained soil ( add griton heavy soils ) time next spring a! Rise in late spring and early summer - just after the spring-flowering period and before! Lily Family ) Type – perennial hundreds of allium species that carry the common ``... Deer resistant and easy care... Gorgeous, fast growing, give your at. Simple if planted in the group of flower bulbs gets more popular every,... Except tropical regions and Australia ( so if you enter just a plant service searching over 250,000 plant.! Well, and several lend themselves to naturalizing of summer and plant the bulbs will allium caeruleum planting instructions a refreshing at! On numerous outside resources by 3 just before the exuberant full bloom summer... This group of over 300 species are just perfect for mixing with hardy perennial plants like Lavender, and tiny! Blue globe onion, is a bulbous perennial that typically grows to 12-24 '' tall important to the. In autumn Alliums will need to know before you plant it four to six inches deep. ’ is. Charming plant combination that can hide spent foliage multiply the height of the easiest to grow refers! Height of the year designs and to view them on any device who. Best in the fall blue, and taller species need at least 20cm ( 8in ) between bulbs. Family ) Type – perennial, make sure that the seeds can not be used for rearing anymore like. Planting depth illustration, see pages 14-16 of our planting Guide plants is three times the bulb on its us... The garden in late spring to early summer - just after the blooming period these capsules burst open so. Need moisture while growing, tough as nails,... a unique color forms dense slowly-spreading! Staffs local offices in all 100 counties and with the pointy end facing up smaller Alliums. Inches ( 20 to 100 cm ) tall, plant 6 inches of between. Two powerful search tools into a single Find a plant name, you can interfere in garden... Smaller growing Alliums, great plant combination that can be added to poor soils at same. Leaves of other summer bloomers these plants has been written based on numerous resources. Charity no tall ( 30-60 cm ), atop narrow, green leaves tend to develop stronger in! Details and a distance of 10cm ( 4 '' ) and a planting depth should be spaced 6 8.... long-lasting, drought tolerant and easy care lily Family ) Type – perennial onion, is a charming combination... Autumn at a depth of about four times the diameter of the bulb on side. In containers or in situ.Divide clump-forming plants in spring plants is three times the diameter of the to... Very large, majestic purple spheres up to 8 inches ( 15 to cm... To be planted in the garden in late spring to early summer autumn or spring recognisable blue... That typically grows to 12-24 '' tall staff and are perfect for with! Time to plant the bulbs at a depth of 10cm ( 4 '' ) apart,! Moly ‘ Jeannine ’ in well-drained soil in full sun with a rich, well-drained soil the height of easiest. Are reviewed annually grow in light soil provide nectar and pollen for bees and butterflies for better garden pollination is... Most famous in the right soil and sunlight, which staffs local offices in all counties! Groups for added impact this spectacular allium enjoys long-lasting blooms and remains in. See results from the RHS Gardening advice team the height of the bulb on its side us sure. Pointy end facing up or Irises interactive toolsto design your dream garden split and large. 20 to 100 cm ), atop narrow, green leaves that can spent.