Allium ‘Globemaster’

ornamental onion

  • © Rick Peterson / Great Plant Picks

  • © Richie Steffen / Great Plant Picks

  • © Richie Steffen / Great Plant Picks

Outstanding Qualities

Huge flower heads, reaching six to eight inches across, are borne on tall stems well above the foliage. The deep violet starburst like flowers open in late spring and make a dramatic statement in a sunny location. The flower heads will fade and dry to a tawny silver that adds an interesting element to the summer garden. These bulbs are great for sandy and dry locations and are completely drought tolerant.

Quick Facts

Plant Type: bulb

Foliage Type: deciduous

Plant Height: 3 ft. 0 in. (0.91 meters)

Plant Width/Spread: 2 ft. 6 in. (0.76 meters)

Hardiness: USDA Zones 6 to 10

Flower Color: purple

Sun/Light Exposure: full sun

Water Requirements: drought tolerant

Wildlife Associations: bees

Colors & Combos

Great Plant Combinations: Eryngium agavifolium, Eucomis comosa ‘Sparkling Burgundy’, Parahebe perfoliata, Perovskia atriplicifolia, Sedum sieboldii

Great Color Contrasts: chartreuse, yellow, silver

Great Color Partners: lavender, pink, purple

Culture Notes
Ornamental onions grow best in full sun and sandy soil. They will tolerate a heavier soil as long as it is very well-drained or even clay soils if the location is sloped and water does not puddle in the winter. Leaves will grow through the late winter and spring, only dying back as the bulb begins to flower. Yellowing leaves can be trimmed to the ground or hidden amongst other plants. Bulbs can be planted in the fall.