‘Globemaster’ giant onion Allium ‘Globemaster’ Type:Perennials Notable Traits:attracts butterflies/pollinatorsgreat cut flowerslow-maintenancetolerates clay soil Hardiness:Zone 5 – 7 Mature Height:24-36in Light:part sun/afternoon shade (eastern exposure)part to full shade (4 hours or less sun)part to full sun (6 hours or more sun)sun (8+ hrs)sun or shade Water:drought tolerantrequires well-drained soil Bloom Color:purple Bloom Shape:globe Bloom Time:spring Foliage:green Description The biggest and best Allium! Silvery purple florets form huge, 8–10″ flower globes of purple over green strappy foliage in late spring. Excellent in mass!