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Giant Onion (Allium giganteum): Towering Lilac-Pink Globes for Summer Borders

Allium giganteum

Overview

Giant onion (Allium giganteum) bears large, rounded flower heads up to 4 inches across with multitudes of star-shaped lilac-pink flowers in summer. Grows 3-6 feet tall. A classic tall allium for cottage and rock gardens.

Botanical Details

Genus: Allium
Species: giganteum

Culture & Uses

Full sun, dry to average, well-drained soil. Sow seed in spring; divide clumps in spring. Bulb rot in damp conditions; onion fly, thrips. Attracts butterflies. Showy flowers and seed heads. Use in beds, borders, cottage gardens, rock gardens. Height 3-6 feet.

Other: Red Baneberry (Actaea rubra): Glossy Red Berries on Woodland Perennial; Carpet Bugleweed (Ajuga reptans): Fast-Spreading Groundcover with Blue Spring Flowers; Ornamental Onion 'Globemaster' (Allium 'Globemaster'): Giant Purple Spheres for Late Spring Drama; Blue Globe Onion (Allium caeruleum): Rare True Blue Flowers for Early Summer; Stars of Persia (Allium christophii): Huge, Metallic Fuchsia Spheres for Early Summer; Chives (Allium schoenoprasum): Edible, Pom-Pom Flowers for Herb and Cottage Gardens; Ornamental Onion (Allium senescens): Twisty Foliage and Pink Summer Blooms; Drumstick Allium (Allium sphaerocephalon): Color-Changing Blooms for the Summer Garden; Japanese Onion (Allium thunbergii): Late-Season Blooms That Defy Frost; Chinese Chives (Allium tuberosum): Edible Leaves and Late Summer Flowers

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