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Allium 'Millenium' - Ornamental onion (photo credit: Growing Colors)


Allium 'Millenium'

Ornamental onion

Allium ‘Millenium’ is a bulbous ornamental hybrid that produces an upright foliage clump of slender, somewhat flattened, grass-like, glossy deep green leaves to 6-12” tall in spring. Unbranched naked scapes rise above the foliage clump to as much as 18-20” tall by mid-summer, each scape being topped by a showy 2-inch ball clusters of rose purple florets. Flowers typically bloom mid to late summer (July-August). 

Although all parts of this plant have an oniony smell and taste when cut or bruised, this hybrid is considered to be an ornamental and is not used for culinary purposes. Attractive to butterflies!


PPA Perennial Plant of the Year 2018

Nectar source for the following butterflies--Eastern Comma, Eastern Tailed-Blue, Eastern Tiger Swallowtail, Gray Hairstreak, Great Spangled Fritillary, Pearl Crescent, Sachem Skipper, Silver Spotted Skipper, White Hairstreak

Ornamental onion Growing and Maintenance Tips:

Easily grown in average, dry to medium moisture, well-drained soils in full sun to part shade. Best in full sun, but appreciates some light afternoon shade in hot summer climates. Tolerates a wide range of soils. Performs well in sandy soils. 


12-18 in



12-18 in


Hardiness Zone:

4 - 9

Characteristics & Attributes for Allium 'Millenium'

Partial Shade
Soil Moisture Preference
Attracts Wildlife
Critter Resistance
Deer Resistant
Rabbit Resistant
Season of Interest (Flowering)
Border or Bed
Mass Planting
Great Companion Plants for Allium 'Millenium'
Missouri Primrose Missouri Primrose (Oenothera macrocarpa (missouriensis) )
Cranesbill Cranesbill (Geranium prantense 'Dark Reiter')
Goldenrod Goldenrod (Solidago 'Little Lemon')
Russian Sage Russian Sage (Perovskia atriplicifolia )
Similar Plants to Allium 'Millenium'
Ornamental Onion Ornamental Onion (Allium tanguticum 'Summer Beauty')