Allium ‘Giganteum’ is one of the tallest of the allium species. From the center of each basal rosette rises a thick, naked, 3-4′ tall scape (stem) which is topped in late spring by a dense, globular, softball-sized, 5-6″ diameter cluster of tiny, star-shaped lilac-purple florets. Dramatic border background plant which is best sited in groups of at least 5-7 bulbs. Leaves and scapes smell like onions when bruised, but plant is not used for culinary purposes. Leaves begin to die back as plants begin flowering. Used as a commercial cut flower. Prefers fertile, very well-drained soil.
Easily grown in average, medium wet, well-drained soils in full sun. Best sited in locations sheltered from strong winds. Leaves will wither and disappear from the garden shortly after bloom. Mature bulbs may be dug up in fall, divided and replanted to increase size of a planting. Alliums, or ornamental onions, are easy to grow bulbs that are increasing in popularity. They look wonderful in cut bouquets and make a unique accent in any perennial border or bed. If you have problems with deer or rodents, Alliums are an excellent choice as they find them distasteful! Position where other plants will help to hide their sometimes-untidy foliage. Excellent for use as cut or dried flowers. Attracts butterflies, too.