2-5 years, Cultivation Create a membership account to save your garden designs and to view them on any device. Gleaming with a metallic sheen, Allium Wow! See allium cultivation for further advice, Propagation Experienced gardeners plant these giant Alliums in groups of several bulbs, set very close together. Allium loves high sun exposure. Try an advanced search, RHS Registered Charity no. Plant Type: Bulbs : Plant Family: Alliums : Exposure: Full Sun : Season of Interest: Spring (Late) Summer (Early) Height: 3' 4' (90cm 120cm) Spread: 1' 2' (30cm 60cm) Spacing: 8" (20cm) Depth: 8" (20cm) Water Needs: Average : Maintenance: Low : Soil Type: Chalk, Clay, Loam, Sand : Soil pH: Acid, Alkaline, Neutral : Soil Drainage: Moist but Well-Drained, Well-Drained 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. We use cookies on this website, you can read about them here. Easy to grow in fertile well-drained soil. All species can be used in the border. Sprinkle seeds liberally over the prepared area and gently cover with about 1/4 inch of soil. The leaves, stalks, and flowers have a geometric look that contrasts with the more billowy, nebulous shapes that commonly fill the garden. Many species bloom in early summer - just after the spring-flowering period and just before the exuberant full bloom of summer. Many hundreds of Allium species exist, but only a modest few have made a name for themselves as garden plants. WHERE: USDA Hardiness zone 3-8, full sun, well-draining soil. Both parent species are hardy, surviving winters in the United States to USDA Zones 4 and 5, and they feature tall flower stalks, or inflorescences, between 2 and 3 feet in height. Allium Globemaster Gladiator grows to be 3 to 5 feet tall and has soft-ball sized rosy-purple flowers. Mon Fri | 9am 5pm, Join the RHS today and support our charity. 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. The description of these plants has been written based on numerous outside resources. Your order will be shipped 1-2 weeks before the ideal planting time for your growing zone (see dates below). Full sun is essential, and dryish summer conditions are preferred. 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. 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. Mixes beautifully with other late spring flowering bulbs and creates stunning combinations with pink or white Delphiniums, Peonies or Irises. Buy allium bulbs from a reputable supplier who will sell you good forms of the correct thing. Allium giganteum is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. Certain small species are just perfect for a rock garden, and several lend themselves to naturalizing. Check these Great Plant Combination Ideas with Alliums, 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 Long-Lasting Summer Idea for your Borders with Perennials, Bulbs & Grasses, An Eye-Catching Border Idea with Allium, Aquilegia and Papaver, 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, Plant of Merit, Showy, 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 3 - 4 feet high (90 - 120 cm), this beauty. 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