Allium 'Globemaster' (Ornamental Onion) – Giant Purple Flowering Allium (Bag of 5 Bulbs)

You get 5 dry bulbs of Allium 'Globemaster' in a bag, ready to plant. They are dormant bulbs, not growing plants. The photos show the flowers in bloom.

Allium 'Globemaster' is one of the most spectacular ornamental onions you can grow. It produces huge, rich violet-purple globe-shaped flowerheads, typically 20 to 25cm across, on tall, stiff stems. Planted in a group of five, it makes a bold display in spring and early summer.

The flowers stay attractive as they fade and dry, and bees and other pollinators love them. They are also excellent as cut flowers, or left to dry naturally on the stem. The grey-green, strap-like leaves die back as the flowers open, so plant the bulbs through low perennials or grasses to hide the fading foliage.

Choose a spot in full sun with well-drained soil, as the bulbs rot if the ground stays wet through winter. Allium 'Globemaster' is fully hardy in the UK and can be left in the ground all year. It also grows well in pots. Plant in autumn at about three times the depth of the bulb's diameter, and let the foliage die back naturally after flowering. Deadhead the flowerheads or leave them in place for structural interest into summer.

Bulbs are harmful if eaten. Keep away from children and pets.

Cultural Information

• Botanical Name: Allium spp.
• Common Name: Ornamental Onion, Giant Allium
• Fully Grown Height and Spread: Approx. 80-100cm tall and 20-25cm wide
• Growth Habit: Upright, with strap-like leaves and tall stems carrying globe flowerheads
• Perfect For: Borders, cottage gardens, cut flower gardens, containers
• Foliage: Grey-green, strap-like leaves that die back as flowering begins
• Flowering Time: Spring to early summer
• Flower Colour: Violet-purple
• Planting Position: Full sun
• Soil Type: Well-drained, moderately fertile soil
• Planting Depth: Approximately 15-20cm deep
• Planting Time: September to November
• Hardiness: Fully hardy in the UK
• Type: Hardy bulb