Ornamental Bulbs Giant Allium (Allium giganteum) Now available—while supplies last. 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. Also known as an ornamental onion, this large variety grows 3-5 feet tall and spreads 1.5 to 2 feet. Allium 'Millenium' produces large chive-like blooms in mid to late summer that make great additions to cut flower bouquets. 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. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Bees love it. 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. It blooms with eight-inch violet-purple flowers atop 12 to 18-inch stalks. Each type of allium adds its own distinctive style and personality to the garden. Another late-bloomer that flowers in autumn. Ozawa allium (Allium thunbergii 'Ozawa'): A tidy, clump-forming plant that grows 18″ to 20″ high. Also, Allium vegetables are tasty (a little too tasty, some might say). A. cristophii, commonly known as star of Persia, is the parent of several ornamental allium favorites. "Allium 'Ivory Queen' is a nice dwarf variety that blooms in early summer. An allium flower head is a cluster of individual florets. wide (12-15 cm) globe-shaped cluster. About 500 species, all from the Northern Hemisphere. Heights also vary, with some flower stalks as short as 5 inches and others as tall as 4 feet. 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. Morphology: This is a perennial derived from a large (2”-3” diameter) underground bulb. Among the last of the perennials to bloom, its flowers often don't open until late September or October. 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. 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). Relatives of the edible onion, peerless as cut flowers (fresh or dried), useful in borders; smaller kinds are effective in rock gardens. It is grown for the dense clusters of flowers, which look like lollipops. 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