About
Allium 'Globemaster' is a robust perennial characterized by its long, strap-like, grey-green leaves that can reach up to 1 meter in length. In summer, it produces large, spherical clusters of violet-purple flowers, each measuring up to 20 centimeters in diameter, atop stems that grow as tall as 80 centimeters.
About the genus
Allium consists of bulbous herbaceous perennials characterized by a pronounced onion or garlic aroma. They feature linear, strap-like, or cylindrical leaves that arise from the base. The flowers, which can be star-shaped or bell-shaped, are arranged in an umbel atop a stem that lacks leaves.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Chalk, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- West-facing, South-facing
- Exposure
- Sheltered
- UK hardiness
- H6
Plant details
- Plant type
- Bulbs
- Habit
- Clump forming
- Foliage
- Deciduous
- Height
- 0.5-1 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 2-5 years
- Suggested uses
- Cottage and informal garden, City and courtyard gardens, Coastal, Gravel garden, Wildlife gardens
- Fragrance
- Foliage
Care notes
- Cultivation
- Easy to grow in fertile well-drained soil. Add grit when grown in clay soils to improve drainage. See allium cultivation for further advice
- Pruning
- No pruning required
- Propagation
- Propagate by seed, sowing in containers in a cold frame when just ripe or in the spring. Alternatively, remove offsets in autumn
- Pest resistance
- Generally pest-free
- Disease resistance
- Generally disease-free but may be susceptible to onion white rot and downy mildews