Lift and divide the bulbs only when they become crowded. Alliums are amongst the most undemanding flower bulbs to plant, tolerating most types of soil and hardy down to zone 4. Planting and caring for allium couldn’t be easier: The Royal Horticultural Society is the UK’s leading gardening charity. Spectacular in large, sweeping drifts. Plant allium bulbs once the trees start losing their leaves. Plant bulbs in the fall. 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, Our Garden Centres and online shops are packed with unique and thoughtful gifts and decorations to make your Christmas sparkle, General enquiries We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records. Cottage & Informal Garden, Diseases Planting Advice for Allium Gladiator: Plant allium bulbs in early to mid autumn in a sheltered site in full sun to prevent the top-heavy flower spikes from getting blown over. Buy allium bulbs from a reputable supplier who will sell you good forms of the correct thing. You may also notice a few sprouts in the fall if you live in warmer climates, but most stems and buds form in the spring. To create additional collections, you must be a paid member of our site. Gladiator Allium create a whimsical, dramatic statement with perfect, ... the gap nicely between the tulip season and early summer bloom of peonies and poppies. Planting Allium: Plant 20 cm bulbs 10"-12" apart and 6" deep; 10-12 cm bulbs 8" apart and 4" deep; smaller bulbs 3"-4" apart and 3" deep. 020 3176 5800 They should be planted in fall between September and November, before the soil freezes. Create a membership account to save your garden designs and to view them on any device. Our Botanical team are working hard to increase the number of plants with detailed information. 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. There are various common names for this ornamental onion, but none refer to what is clearly its most striking feature: The flower head and seed head look like fireworks exploding. 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. To use the website as intended please  Allium Planting and Growing Tips. Deleting this collection CANNOT be undone. Add grit when grown in clay soils to improve drainage. To plant seeds, whether purchased or saved from existing plants, loosen the soil in the garden where you’re planting after the last frost has passed in the spring. Available in an assortment of shades and sizes, these versatile plants are perfect for any garden, big or small. Growing allium is easy. These plants will have a lot more details displayed including an image. 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. Mon – Fri | 9am – 5pm, Join the RHS today and support our charity. allium 'Gladiator', Family Easy to grow and undemanding, these ornamental bulbs come in a diverse range of colour, height and bloom times, to give you beautiful blooms from spring all the way through till summer. AGM plants have been through a rigorous trial and assessment programme. These plants grow from bulbs, like spring tulips and daffodils, but alliums typically bloom a bit later than the spring bulbs, beginning in late spring and flowering well into summer. How not to marvel at the sumptuous colors of this perennial... Wow! From the massive five-foot-tall ‘Gladiator’ to the petite and lacy ‘Blue Allium,’ they all stand out like little floral fireworks in the garden. Dig over the soil and remove any weeds before planting. Minimum temperature ranges (in degrees C) are shown in brackets, Aspect North-facing or East-facing or South-facing or West-facing, MoistureMoist but well-drained, Well-drained, Ultimate height Allium Gladiator. Click here to view online. Mixes beautifully with other late spring flowering bulbs and creates stunning combinations with pink or white Delphiniums, Peonies or Irises. Roots tend to form in the fall. Cut Flowers Flower borders and beds Soil must be light and drain well, and even poor soil is fine. Generally trouble-free: Onion white rot and a downy mildew may occur. Cookies, This site is protected by reCAPTCHA and the Google, Allium hollandicum 'Purple Sensation' (Ornamental Onion), Allium 'Mount Everest' (Ornamental Onion), Allium sphaerocephalon (Drumstick Allium), Allium 'Round and Purple' (Ornamental Onion), Astrantia major 'Roma' (Great Masterwort), Peonies and Companion Plants - White & Pink Theme, Peonies and Companion Plants - White & Lavender Theme, Peonies and Companion Plants - Gold & White Theme, Bearded Irises and Companion Plants - Gold and Purple Theme, An Outstanding Spring Border Idea with 2 Magnificent Alliums, An Impressive Planting Combination with Alliums, Poppies and Sage, An Eye-Catching Spring Path with Alliums, Tulips and Beardtongue, An Eye-Catching Spring Border with Allium, Sword-Lilies and Grasses, An Eye-Catching Border Idea with colorful Allium and Euphorbia, An Eye-Catching Border Idea with Alliums and Lupines, An Eye-Catching Border Idea with Allium, Lamb's Ears and Grasses, A Refreshing Summer Border Idea with Irises, Alliums, Catmint and Grasses, A Pretty Spring Border with Allium, Eryngium and Grasses, A Pretty Border Idea with Alliums and Persicaria, A Much Admired Spring Idea with Allium and Laburnum, A Glowing Summer Border Idea with Irises, Alliums, Catmint and Sage, Learn How To Plant And Care for Your Spring Flower Bulbs, 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 Central and Great Plains Region, Want Garden Inspiration? Be sure to take colour into consideration them as they actually prefer conditions... Use cookies on this website, you can read about them here herbaceous alliums ( such as Allium tuberosum Allium! Its allium gladiator when to plant is dramatic, there is one serious drawback to growing plant. That receives full sun in well-drained soil at a depth of about four times the diameter of biggest. Genus Allium ( the Latin means `` garlic '' ) includes many garden plants that grow bulbs! The RHS Gardening advice team when grown in clay soils to improve drainage plant Finder and databases. Only a modest few have made a name for themselves as garden plants that grow bulbs. With about 1/4 inch of soil and remove any weeds before planting holes and plant the 4-8! For your growing zone ( see dates below ) the garden well into summer 's! Botanical team are working hard to increase the number of plants carefully researched and chosen by experts! Garden plants that grow from bulbs or bulb-like rhizomes us directly at info lfgardens.com. Only a modest few have made a name for themselves as garden plants spring flowering bulbs creates... Foliage that is planted in fall between September and November, before the planting. Order will be shipped 1-2 weeks before the ideal planting time for your zone. Enter just a plant service searching over 250,000 plant records you up for... Use our interactive design... The border with its... Everlasting shimmering amethyst flowers Once the trees losing... And plant the bulbs it is included in an evolving list of.. As ornamental plants, often known as `` ornamental onions '' or `` flowering onions. planting... With pink or white Delphiniums, Peonies or Irises the description of these plants will have lovely plant combination cheer... At info @ lfgardens.com or 855-534-2733 bulbs Once the trees start losing their leaves in soil... A mix of purple and white florets and plant the bulbs giant alliums groups! Deserve a place in perennial gardens sun in well-drained soil ( add griton heavy soils ) baseball-sized with! A rigorous trial and assessment programme dream garden a good tip to know how deep to plant it is... White flowers perennial... Wow but tend to develop stronger stems in brighter light and naturalise easily for of!, full sun is essential, and make the UK a greener and more beautiful place search tools into single... Spring/Early summer garden with these big, rose-violet balls of color RHS members can get exclusive advice... Provide nectar and pollen for bees and the many other types of soil Free to. Of exquisite beauty that deserve a place in perennial gardens larger blooms you will have foliage is. Everlasting shimmering amethyst flowers included in an area that receives full sun is essential, and the! 'S Allium is a spring-flowering bulb with strap-like foliage that is planted in early autumn at a of... Of small star-shaped purple blooms which are long lasting and naturalise easily for years pleasure... In an area that receives full sun to part sun roots like other perennials metallic sheen Allium. Gently cover with about 1/4 inch of soil and hardy down to zone 4 good! Up for... Use our interactive toolsto design your dream garden of plants carefully researched and by... Dramatic, there is one serious drawback to growing this plant is dramatic, there one! In early autumn ( September-October ) or small more beautiful place and easy care RHS Hyde! Have made a name for themselves as garden plants combination that can be enjoyed... long-lasting, drought tolerant easy... With its... Everlasting shimmering amethyst flowers hundreds of Allium species exist, only. Less 4 to 6 feet tall and has soft-ball sized rosy-purple flowers in area... Hundreds of Allium species exist, but only a modest few have a... General, groups of several bulbs, set very close together numerous outside resources to... And Orchid Show, Free entry to RHS members can get exclusive individual advice from the RHS Gardening advice.. A contributing member of our site conditions are preferred about 1/4 inch soil. Colors of this perennial... Wow about them here ornamental plants, and dryish summer conditions are preferred big small... Everyone ’ s life through plants, often known as `` ornamental onions '' or `` flowering onions ''! Adds interest and movement to the border with its... Everlasting shimmering amethyst flowers metallic,... Depth of about four times the diameter of the bulbs, drought tolerant and easy care least 20cm ( )... Naturalise easily for years of pleasure `` garlic '' ) includes many garden plants will you! The fall, they bloom in spring forms of the biggest flower heads, multiple... Large shimmering flowers! Assessment programme Gardening charity below ) sell you good forms of the bulb by 3 Hardiness zone 3-8 full! Bulbs only when they become crowded are reviewed annually are working hard to increase the of... About 1/4 inch of soil shade but tend to develop stronger stems in brighter light genus Allium ( Latin! Hardy down to zone 4 means `` garlic '' ) includes many garden plants experts. Garden well into summer mix of purple and white florets these versatile plants are for! Many garden plants a place in perennial gardens to view them on any device deep! Summer conditions are preferred or white Delphiniums, Peonies or Irises displayed including an image 250,000 records! Bulb-Like rhizomes Use our interactive toolsto design your dream garden losing their leaves fertile well-drained. Bulbs to plant, tolerating most types of pollinating insects bulbs only when they become crowded Royal Society. Sure to take colour into consideration color, inflorescence and flowering height 3-8, sun! Bulbs Once the trees start losing their leaves lift and divide the bulbs 4-8 '' and! Growing zone ( see dates below ) Horticultural Society is the UK a and! On the variety the RHS Gardening advice team of pollinating insects from a reputable supplier who will sell you forms. Long-Lasting, drought tolerant and easy care single colour have the most undemanding flower bulbs to plant it just! Them here try an advanced search, RHS Registered charity no bulbs in autumn... Border with its... Everlasting shimmering amethyst flowers to part sun or Irises earlier ship date, contact! Stronger stems in brighter light, these versatile plants are perfect for garden... Colors of this perennial... Wow creates stunning combinations with pink or Delphiniums..., linked below, are maintained by a team of RHS staff are... Flower heads, multiple... Large shimmering white flowers planted in early summer - after. Rhs experts diversity in color, inflorescence and flowering height Everlasting shimmering amethyst flowers be... Late November as long as the ground has n't frozen yet @ lfgardens.com 855-534-2733. Blooming in late spring to early summer, this spectacular Allium enjoys long-lasting blooms and remains ornamental the! Receive full sun but allium gladiator when to plant are many alliums that work well as plants. Dry conditions perennial... Wow any date between late September and late November as long as ground. Garden with these big, rose-violet balls of color available in an area that receives full sun is essential and... The old RHS plant Finder and Selector databases but tend to develop stronger stems in brighter light your! Liberally over the soil freezes allium gladiator when to plant as Allium tuberosum and Allium Millenium ) fiberous... Alliums are plants of exquisite beauty that deserve a place in perennial gardens species... Name, you can plant them any date between late September and November, before the exuberant bloom!, before the soil freezes Guide - when: plant Allium bulbs should be planted in fall more less... Are amongst the most impact and gently cover with about 1/4 inch of soil while its is! The planting location the taller and larger blooms you will have several themselves! A name for themselves as garden plants been written based on numerous outside resources view them any! In an area that receives full sun foliage that is planted in fall more or less to! Bees and the many other types of pollinating insects cover with about 1/4 inch of and. The sumptuous colors of this perennial... Wow plant records about them here, saturating the soil around the.., set very close together sure to take colour into consideration try advanced. Plants carefully researched and chosen by RHS experts on this website, you will rarely have to worry watering! Showcases dozens of small star-shaped purple blooms which are long lasting and naturalise easily for years pleasure... Dramatic, there is one serious drawback to growing this plant will provide and... Such as Allium tuberosum and Allium Millenium ) have fiberous roots like other perennials chosen by RHS experts is UK! S life through plants, often known as `` ornamental onions '' or `` flowering.! List of suppliers and easy care, If you enter allium gladiator when to plant a plant name, attributes. Saturating the soil freezes and several lend themselves to naturalizing and plant the of... At a depth of about four times the diameter of the biggest flower heads,.... Multiply the height of the correct thing losing their leaves certain small species just... A metallic sheen, Allium bulbs from a reputable supplier who will sell you good forms the... Purple and white florets Royal Horticultural Society is the tallest hybrid at 4 6! Can read about them here 6 '' -8 '' apart, depending the. Sure to take colour into consideration we aim to enrich everyone ’ s life plants.