Among the last of the perennials to bloom, its flowers often don't open until late September or October. Another late-bloomer that flowers in autumn. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Also known as an ornamental onion, this large variety grows 3-5 feet tall and spreads 1.5 to 2 feet. A. cristophii, commonly known as star of Persia, is the parent of several ornamental allium favorites. It is grown for the dense clusters of flowers, which look like lollipops. The large A. giganteum, aka giant allium, grows up to four feet tall with six to eight-inch purple blooms. Since I’m sure we’re all familiar with the more traditional alliums—garlic, onions and chives—let’s dig a little deeper into this fabulous ornamental and edible genus. Bees love it. It is a bulbous perennial (large bulbs to 2-3” diameter) which produces a basal rosette of grayish-green, strap-shaped leaves (to 18” long). Ozawa allium (Allium thunbergii 'Ozawa'): A tidy, clump-forming plant that grows 18″ to 20″ high. Morphology: This is a perennial derived from a large (2”-3” diameter) underground bulb. The author gives perspective to Allium giganteum. Each type of allium adds its own distinctive style and personality to the garden. Also, Allium vegetables are tasty (a little too tasty, some might say). It blooms with eight-inch violet-purple flowers atop 12 to 18-inch stalks. Ornamental Bulbs Giant Allium (Allium giganteum) Now available—while supplies last. Follow these up with a gorgeous display of Allium bulgaricum and Allium giganteum. At SummerWinds Nursery, we sell a variety of bulb sets—from ornamental to edible. Allium giganteum, commonly called giant onion, is perhaps the tallest of the ornamental onions. An allium flower head is a cluster of individual florets. The overall shape may be round, oval or cascading, and the flower color may be white, yellow, pink, purple or blue. The giant allium (Allium giganteum) stands out among other ornamental alliums with its 4-inch wide lavender flowers, which appear atop 5- to 6-foot tall stalks. Relatives of the edible onion, peerless as cut flowers (fresh or dried), useful in borders; smaller kinds are effective in rock gardens. Allium vegetables contain many potent natural substances that are good for your heart, your cells, and your immune system. Allium giganteum is a plant of semi-arid areas, and can tolerate cold winters with temperatures going below zero - at least down to -5°c without protection in our winter-wet garden in Cornwall, England. About 500 species, all from the Northern Hemisphere. Allium 'Millenium' produces large chive-like blooms in mid to late summer that make great additions to cut flower bouquets. Description Giant Allium, or ornamental onion as it is often called, is related to the garden onions, garlic and leeks. 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