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Giant Onion (Allium giganteum).

Giant onion is perhaps the tallest of the ornamental onions. From the center of each basal rosette rises a thick, naked, 3-4' tall stem which is topped in late spring by a dense, globular, softball-sized, 5-6" diameter cluster of tiny, star-shaped lilac-purple florets.

If you want more information about this flower, just search the plant's Latin (botanical) name on Google:

giant onion

fireball Lily fritillary home
giant onion ginger lily next