We're offering you a Up to 4 Allium Globemaster Bulbs for £6.99, saving you up to 30% off Thompson and Morgan's's price of £9.99 (correct as of 26.08.2025).

Add Striking Structure and Colour with Allium 'Globemaster'

The Allium 'Globemaster' is a celebrated perennial bulb from the onion family (Alliaceae), renowned for its giant, globe-shaped violet-purple flower heads that rise above lush green foliage. This variety is a show-stopper in any garden, producing blooms up to 20cm wide on strong stems reaching 80cm tall. Its bold architectural form and vivid colour make it a favourite among garden designers and plant enthusiasts alike.

Why Choose 'Globemaster'?

• Award Winner: Recognised with the RHS Award of Garden Merit for outstanding performance and reliability.
• Seasonal Drama: Flowers appear in late spring to early summer (typically May–June), adding height and colour just as many spring bulbs fade.
• Versatile Use: Perfect for sunny borders, gravel gardens, or as an eye-catching cut flower indoors.
• Wildlife Friendly: Attracts bees and other pollinators while being generally untroubled by deer or rabbits.

Growing Guide

• Planting Time: Plant bulbs in autumn (September–November) before the ground freezes.
• Location: Choose a spot in full sun with well-drained soil; avoid waterlogged areas.
• Soil Preference: Prefers neutral to slightly alkaline soils but adapts well to most garden soils if drainage is good.
• Spacing: Plant bulbs about 15–20cm apart and at a depth of three times the bulb's height.

Caring for Your Alliums

• Watering: Water after planting and during dry spells but avoid overwatering.
• Fertilising: Apply a balanced bulb fertiliser at planting time and again as shoots emerge in spring.
• No Pruning Needed: Allow foliage to die back naturally after flowering; this helps bulbs store energy for next year.
• Pest Resistance: Generally resistant to pests and diseases; minimal maintenance required once established.

Design Ideas & Companion Plants

• Companion Plants: Pair with ornamental grasses, late-spring tulips, or hardy perennials like Nepeta or Salvia for layered colour and texture.
• Borders & Beds: Mass plantings create maximum impact; also works beautifully as a single accent among lower-growing plants.

FAQs

• When is the best time to plant Allium 'Globemaster' bulbs?
  The ideal time is autumn (September–November), before the first frost sets in.
• How tall do these alliums grow?
  'Globemaster' typically reaches around 80cm (31 inches) in height when mature.
• What care do they need after flowering?
  Allow the foliage to die back naturally; remove spent flower heads if desired. Little maintenance is required once established.