Allium is remarkably resilient in a dormant state and can wait to be planted, but needs to be in the ground a few weeks before the ground freezes in order to put down roots. These may be planted at any time during the growing season. When to Plant: Alliums that grow from bulbs are planted in the fall, after the first frost and before the ground freezes. Allium is a superb flower, famous for its surprising ornamental floral scapes.. Key Allium flower facts. This is really a great seller for us. It was originally selected in 2000 by Allium maven Mark McDonough. Today, they can be found growing pretty much everywhere except tropical regions and Australia.. These perennials over winter perfectly in containers in the nursery and they are one of the first plants to wake up in the spring. Cultivation Grow in reasonably fertile, well-drained soil with full sun. ‘Millenium’ Ornamental Onion is super hardy member of the Allium family. Name – Allium giganteum Family – Liliaceae (lily family) Type – perennial. How to grow. Plant … This superb allium hybrid is difficult to find in the trade. Planting Giant Alliums: Choose a spot with full sun and good soil drainage. When planting multiple allium bulbs, the bulbs should be spaced 6 to 8 inches (15 to 20 cm) apart. See allium cultivation advice Propagation Propagate by … 15" tall x 18-22" wide (Propagated by division). 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. They are hardy in zones 4 through 8. Doing so can improve drainage conditions. Plant them at a depth of 2-3 times their diameter (4-6”) in a well-drained sunny or partly-shaded site. Flowering – May to July. Typically pest and disease free. The Perennial Plant Association has rightly awarded Allium Millenium the 2018 Plant of the Year®! Plant dormant allium bulbs in the fall according to your growing zone. Height – 8 to 40 inches (20 to 100 cm) Exposure – full sun Soil – ordinary. Mature plants are covered in dozens of long lasting flowers. Tolerates soil of any fertility and will grow in clay soil. Allium ‘Millennium’ is a fantastic mid- late-summer-flowering allium, bearing large, rounded heads of pink-purple flowers in June and July. Its globe-shaped, rosy-purple flowers add a perky, colorful focus to your late summer garden. Its aromatic foliage also makes it deer and rabbit resistant. 5. Herbaceous alliums (such as Allium tuberosum and Allium Millenium) have fiberous roots like other perennials. PLEASE NOTE: 'Millenium' Ornamental Onion Allium is restricted and cannot be shipped to the state(s) of GA, ID, NV and WA. Plant the bulbs pointed-end up. They do fine in full sun but do equally well in partial shade. The leaves generally die down before the flowers open. Plant the allium bulbs with the pointy end facing up. 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