Giganteum means Giant. Allium giganteum is exactly that. Giant globes of purple flowers, I came across one day, walking down on the banks of the River Thames. They are eye-catching. Allium giganteum is also called the Giant Onion or Giant Allium. It is a bulbous herbaceous perennial and is an ornamental onion plant. It is part of the Amaryllidaceae family of plants.
The leaves usually die down before the flowers. Either way, the leaves are at a much smaller scale than the giant flowers. Allium giganteum is native to Asia and North-East Iran. It flowers in late spring or summer. The flowers are little star-shaped lilac flowers formed in a cluster depicting a globe. The blooms are long-lasting and colorful and look nice both in the garden as well as in flower arrangements.
How to grow Allium giganteum:
Allium giganteum likes full sun and should be grown in moist but well-drained soil. It grows to about 1.5m or 5ft. It is easy to grow and looks good in beds and borders mixed with other flowers. Its height is due to the long narrow stems of the flowers. It adds height and color without shading other plants. Allium giganteum is easy to maintain. No pruning is necessary. Allium giganteum is generally pest-free. However, onion white rot and downy mildew can happen.
You can propagate this plant by seed. Sow the seeds in spring. It attracts butterflies. Yet, it is deer-resistant and drought-tolerant. It has a scent not necessarily a pleasant one. Most onion related plants do have similar types of scent.