Allium giganteum (Giant Onion)
The Allium giganteum, often referred to as the giant onion, is known as one of the tallest ornamental onion varieties. This perennial plant grows from large bulbs measuring approximately 5–7.5 cm in diameter. It develops a base cluster of elongated, strap-like leaves with a grayish-green hue, each reaching up to 45 cm in length. From the center of this foliage emerges a sturdy, leafless stem (scape) that can grow between 90–120 cm in height. In late spring, the stem is crowned with a dense, spherical flower cluster (umbel), roughly 13–15 cm in diameter, composed of numerous tiny, star-shaped florets in shades of lilac-purple. While the leaves and stems emit a characteristic onion-like aroma when crushed, the plant is not used for cooking. The foliage begins to wither as the flowers start to bloom.
Cultivation: This plant thrives in ordinary, moderately moist, well-draining soil under full sunlight. Choose a spot protected from strong winds for best results. In autumn, plant bulbs at a depth of 12-15 cm and space them 23-30 cm apart. After flowering, the foliage will fade and disappear from the garden. To expand your planting, dig up mature bulbs in the fall, divide them, and replant.
Etymology: The genus name Allium is derived from the Latin word allium meaning “garlic.” The specific epithet giganteum comes from the Latin word gigans, meaning “giant,” referring to the plant’s large size.
