Ornamental onion (Allium 'Globemaster') AL-ee-um Genus:  Allium Allium 'Globemaster' is a true showstopper, growing to about 32 inches tall. Very large, majestic purple spheres up to 8 inches across bear numerous star-shaped, deep lilac flowers in May and June. Care:  Provide full sun and well-drained, average to dry soil. Propagation:  Sow seed in spring in containers or in situ. Divide clump-forming plants in spring. Problems:  Bulb rot in damp conditions. Onion fly and thrips.

Overview

Height 3 ft. to 6 ft. Spread 6 in. to 12 in. Growth Habit Clumps Growth Pace Fast Grower Light Full Sun Only Moisture Dry to Medium Maintenance Low Characteristics Attracts Butterflies, Showy Seed Heads Bloom Time Early Summer, Late Spring, Spring, Summer Flower Color Purple Uses Beds and Borders Style Cottage Garden, Rock Garden Seasonal Interest Summer Interest Type Bulbs