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Allium ‘Globemaster’, commonly known as **Giant Ornamental Onion**, is a striking perennial bulb renowned for its **huge, violet-purple spherical flower heads** that reach up to 20cm in diameter. Flowering in **late spring to early summer**, it adds dramatic architectural interest to borders and garden displays.
Sun Requirement: Full Sun Rate of Growth: Moderate Soil Type: Well-drained, Fertile Hardiness: H5 (-10C to -15C) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Potted: Bulbous Perennial
Common Name: Giant Ornamental Onion
Other Names: Allium ‘Globemaster’
Indoors or Outdoors: Outdoors
Size: Height 80cm, Spread 20cm
Mature Size: Reaches up to 80cm in height and spreads up to 20cm.
Evergreen or Deciduous: Deciduous
Preferred Position: Thrives in full sun.
Hardy or Not Hardy: Hardy to -10C.
Diseases: Generally disease-resistant but may suffer from onion rot in poorly drained soils.
Uses in Garden: Ideal for borders, gravel gardens, and architectural interest.
Sowing Time: Plant bulbs in autumn.
Soil & Watering: Prefers well-drained soil and moderate watering.
Trench Preparation: Plant bulbs 10-15cm deep.
Pruning Tips: Remove spent flower heads to prevent self-seeding.