Globemaster Ornamental Onion (Allium 'Globemaster')

Globemaster Ornamental Onion (Allium 'Globemaster') is a perennial with large, spherical blooms reaching up to 10 inches across. Hundreds of tiny purple flowers form each globe, creating a striking display from late spring to early summer above glossy deep green leaves.

Plant among lower-growing plants in a sunny border so the flower spheres stand out. Pair with switchgrass, Russian sage, or stonecrop for contrasting textures. Globemaster attracts butterflies and is resistant to deer and rabbits.

Growing details

• Plant type: Perennial
• Mature spread: 1–1.5 feet
• Spacing: Approximately 1 foot apart
• Hardiness: USDA zones 5–8
• Light: Full sun to part sun
• Soil: Well-drained soil
• Flowers: Purple spheres up to 10 inches across
• Bloom season: Late spring to early summer
• Tolerance: Drought

Care and garden use

This low-maintenance plant needs good drainage. Overly moist or poorly drained soil can cause bulb rot. Watch for mildew, rust, leaf spot, and occasional thrips.

Use as an accent or in grouped plantings, sunny borders, naturalized areas, rock gardens, low-water gardens, or containers with good drainage.

Image credits: Mike Peel (www.mikepeel.net), Allium Globemaster 1, CC BY-SA 4.0; Mykola Swarnyk, Allium Globemaster RBG, CC BY-SA 3.0. Plants naturally vary in appearance and may differ from the images shown.