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. Ozawa allium (Allium thunbergii 'Ozawa'): A tidy, clump-forming plant that grows 18″ to 20″ high. wide (12-15 cm) globe-shaped cluster. A. cristophii, commonly known as star of Persia, is the parent of several ornamental allium favorites. Each type of allium adds its own distinctive style and personality to the garden. Among the last of the perennials to bloom, its flowers often don't open until late September or October. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. 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. Allium giganteum, commonly called giant onion, is perhaps the tallest of the ornamental onions. And they’re one of the most affordable and nutritious ways to add flavor and aroma to almost any dish. The large A. giganteum, aka giant allium, grows up to four feet tall with six to eight-inch purple blooms. At SummerWinds Nursery, we sell a variety of bulb sets—from ornamental to edible. 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). It is grown for the dense clusters of flowers, which look like lollipops. Follow these up with a gorgeous display of Allium bulgaricum and Allium giganteum. An allium flower head is a cluster of individual florets. It blooms with eight-inch violet-purple flowers atop 12 to 18-inch stalks. Description Giant Allium, or ornamental onion as it is often called, is related to the garden onions, garlic and leeks. Bees love it. Heights also vary, with some flower stalks as short as 5 inches and others as tall as 4 feet. Morphology: This is a perennial derived from a large (2”-3” diameter) underground bulb. Allium 'Millenium' produces large chive-like blooms in mid to late summer that make great additions to cut flower bouquets. About 500 species, all from the Northern Hemisphere. 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. Allium vegetables contain many potent natural substances that are good for your heart, your cells, and your immune system. 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. 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