Millenium
Allium 'Millenium'
Also called ornamental onion and flowering onion
Millenium blooms from July through August.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Millenium
Plant it in full sun. It prefers low water. It is hardy in USDA zones 4–9. Expect it to reach about 1.5 ft tall and 12 in wide at maturity, in roughly 2 years.
When to plant Millenium
Plant Millenium in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. For the middle of its hardy zones 4 to 9 range, spring means March to May and fall means August or September. Once settled, it blooms from July to August.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in March.
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