Origin
Allium 'Cobalt Millenium' belongs to the genus Allium, which occurs worldwide in temperate regions. This particular cultivar was developed through breeding work focusing mainly on ornamental value and flowering. The plant is a relatively recent introduction among ornamental onions. Its origin lies with nurseries specialising in the selection of garden-worthy Alliums.

Characteristics
Allium 'Cobalt Millenium' is a perennial with a compact, upright growth habit. It is characterised by spherical, violet flower heads borne on sturdy stems. The flowering period generally falls in the summer months. The leaves are narrow, glossy, and green, and remain ornamental for a long time. The plant reaches a height of approximately 35 to 40 centimetres.

Care
Allium 'Cobalt Millenium' grows best in a sunny position. The soil should be well-draining to prevent root rot. A moderately fertile soil contributes to healthy growth and flowering. The plant is hardy and requires little maintenance apart from the usual care of perennials. Excess moisture during winter is poorly tolerated.