18 Best Allium Varieties | Ornamental Onion Types

Allium genus has many species to choose from. To make it easy for you, we have selected the Most Popular Allium Varieties with the best blend of colors and charm that will surely add a lot of appeal to your garden!

Botanical Name: Allium ‘Moly’

Zones: 3-9

Size: 12-18 inches tall

Also known as lily leek, this beautiful Allium is loved for yellow flowers that bloom from late spring to mid-summer. It prefers full sun to partial shade and well-draining soil.

Botanical Name: Allium caeruleum

Zones: 4-8

Size: 18-24 inches tall

This showy small onion features sky blue flowers in a 1-2 inch ball-like cluster. It looks wonderful in beds, borders, meadows, and rock gardens. The plant favors full sun and well-draining soil.

Botanical Name: Allium oreophilum

Zones: 4-11

Size: 14-20 inches tall

This short Allium type produces charming magenta florets that create loose flower heads. When grown in masses, it forms beautiful scenery. Plant it in full sun and well-draining soil.

Botanical Name: Allium ‘Globemaster’

Zones: 5-8

Size: 24-48 inches tall

This tall Allium variety is planted for its light purple showy 6-8 inches wide flower heads. Grow the plant in the full sun using well-draining soil.

Botanical Name: Allium hollandicum ‘Purple Sensation’

Zones: 4-9

Size: 18-36 inches tall

‘Purple Sensation’ produces 4-5 inches wide globes of striking purple-violet blooms that grow on 24-30 inch stalks. Plant the bulbs in full sun to part shade in well-draining soil.

Botanical Name: Allium cristophii

Zones: 4-8

Size: 16-28 inches tall

Star of Persia produces 90-100 individual small blooms in one flower head. The light purple blossoms can reach up to 10-12 inches in diameter.

Botanical Name: Allium ‘Millenium’

Zones: 5-8

Size: 10-14 inches tall

This long flowering variety