Allium 'Globemaster'

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 (-10°C to -15°C)

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Why Choose Allium 'Globemaster'?

• ✅ **Huge flower heads** up to 20cm across for bold garden impact.
• ✅ **Bee-friendly** – attracts pollinators and beneficial insects.
• ✅ **Long-lasting blooms** for weeks of garden colour.
• ✅ **Drought-tolerant** once established.

Allium 'Globemaster' - Description

Potted: Bulbous Perennial

Common Name: Giant Ornamental Onion

Other Names: Allium 'Globemaster'

Indoors or Outdoors: Outdoors

Size: Height 80cm, Spread 20cm

Allium 'Globemaster' - Characteristics

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 -10°C.

Diseases: Generally disease-resistant but may suffer from onion rot in poorly drained soils.

Allium 'Globemaster' - Uses

Uses in Garden: Ideal for borders, gravel gardens, and architectural interest.

Allium 'Globemaster' - Planting Instructions

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.

Plant at a Glance

• facing:south
• facing:west
• lightrequirement:full sun
• soiltype:well-drained
• soiltype:fertile
• flowering:may
• flowering:june
• flowercolour:purple
• leafcolour:green
• planttype:deciduous
• sizecategory:80cm
• soilmoisture:moist but well-drained
• specialconditions:coastal
• gardenstyle:formal
• gardenstyle:architectural