Relatives of the edible onion, peerless as cut flowers (fresh or dried), useful in borders; smaller kinds are effective in rock gardens. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. It is grown for the dense clusters of flowers, which look like lollipops. Also known as an ornamental onion, this large variety grows 3-5 feet tall and spreads 1.5 to 2 feet. Bees love it. Description Giant Allium, or ornamental onion as it is often called, is related to the garden onions, garlic and leeks. Among the last of the perennials to bloom, its flowers often don't open until late September or October. Morphology: This is a perennial derived from a large (2”-3” diameter) underground bulb. Allium vegetables contain many potent natural substances that are good for your heart, your cells, and your immune system. Each type of allium adds its own distinctive style and personality to the garden. Heights also vary, with some flower stalks as short as 5 inches and others as tall as 4 feet. "Allium 'Ivory Queen' is a nice dwarf variety that blooms in early summer. 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. An allium flower head is a cluster of individual florets. It blooms with eight-inch violet-purple flowers atop 12 to 18-inch stalks. Ozawa allium (Allium thunbergii 'Ozawa'): A tidy, clump-forming plant that grows 18″ to 20″ high. Follow these up with a gorgeous display of Allium bulgaricum and Allium giganteum. Allium 'Millenium' produces large chive-like blooms in mid to late summer that make great additions to cut flower bouquets. 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. The large A. giganteum, aka giant allium, grows up to four feet tall with six to eight-inch purple blooms. Allium giganteum, commonly called giant onion, is perhaps the tallest of the ornamental onions. Ornamental Bulbs Giant Allium (Allium giganteum) Now available—while supplies last. A. cristophii, commonly known as star of Persia, is the parent of several ornamental allium favorites. Perhaps the tallest of the ornamental onions, Allium giganteum is a striking and bold addition to the garden with its star-shaped, tiny lilac-purple flowers forming a 5-6 in. 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. The author gives perspective to Allium giganteum. The overall shape may be round, oval or cascading, and the flower color may be white, yellow, pink, purple or blue. About 500 species, all from the Northern Hemisphere. 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