Allium Giganteum - Giant Ornamental Onion. Are you looking for an eye-catcher in your spring garden? Then Allium giganteum is a good choice. Allium Giganteum is a giant amongst the ornamental onions. It is a perennial plant that grows up to approximately 150 to 180 cm. Flowering period April / May.With their beautiful globe shaped flower heads, standing firmly erect on slender stems, it’s no wonder Alliums are so popular. Our purple and white Alliums add much needed interest to the garden and are very versatile, easy to combine, low maintenance plants, as well as being excellent cut flowers and bee and butterfly magnets!
